Default model (Qwen3.6-35B-A3B on ik_llama.cpp), dev @ 9019db82, default profile, mock sandbox (nothing
executed). The method is described on the benchmark page: every core item of K1–K10 (K1.1 split
into family and class), 57 items; build items only as consistency checks; chain and later items not scored. Human
sources: B Bitsight (names this hash), E Elastic, P Proofpoint.
Grading rule for "partly", stated because this report has an 81-row FLOSS string list in Appendix A. The baseline
gave "partly" when a deterministic tool put the raw fact in the report and no model turned it into the finding. It is
kept unchanged and split into two kinds so the reader can discount them:
- partly (body) — the report body states part of the item, or states it with the wrong purpose;
- partly (appendix) — the item's own value (the IOC, the format string, the command keyword) is printed only in
Appendix A › Floss: strings, with no sentence about it. A behaviour that a string in the appendix only hints at (e.g.
:wtfbbq for self-deletion) is missed, not partly.
§5.2 capa rows "resolve function by parsing PE exports", "hash data with CRC32"; §5.7 "the network functionality is obfuscated or dynamically resolved". "By hash" is never said; CRC32 is read as "data integrity or identification"
B Windows API resolution
K2.2 abort on failed check
missed
—
B Anti analysis
K2.3 mutex single instance
missed
CreateMutexW only in the import table; runnung only in the appendix, never tied to it
B Mutex
K2.4 copy to AppData, then persist
partly (body)
"Establishes persistence by creating scheduled tasks …" (§4 step 4). No copy step; AppData only in the appendix
B Persistence
K2.5 register, then command loop
partly (body)
"Constructs a POST request payload containing the collected system information and executes it to a remote server" (§4 step 3). No loop, no instruction handling
B Communications protocol
K2.6 update_data.dat read for new C2s
partly (body)
"strings related to file operations (%d.dat, \update_data.dat, files/bp.dat) … drops additional payloads or updates itself" — named, purpose wrong
§5.2 capa row "PEB access · B0001.019"; §7 "Debugger Detection::Process Environment Block". Never stated as a debugger check
B Debugger check
K3.2 process count
missed
—
B
K3.3 architecture / WOW64
missed
—
B, E
K3.4 MAC check
missed
—
B
K3.5 PEB walk + CRC32 names
partly (body)
capa PEB/CRC32/export rows in §5.2; prose "CRC32 hashing for data integrity or identification"
B Windows API resolution
K3.6 string encryption
partly (body)
"Emulation recovered 81 strings [ev_0012]"; "Additional encoded strings reference …". That the strings are encoded is stated; the scheme is attributed to "stackstrings and RC4 encryption", not a rolling XOR
B Strings decryption; E
K3.7 self-deletion via ADS
missed
:wtfbbq only in the appendix (a hint, not the behaviour)
Custom_update, Update_%x, AppData, .dll in the appendix only
B Persistence
K5.2 task Updater, COM, at logon
partly (body)
§5.4 "persistence mechanisms involving scheduled tasks … (LogonTrigger, PT0S …)"; T1053.005 published. The name Updater only in the appendix; COM not said
B Persistence
K5.3 update_data.dat holds new C2 URLs
partly (body)
named as a file string; purpose given as payload/update
B
K6.1 HTTPS POST /live/
found
§5.5 "packaged into a POST request … transmitted to the endpoint https://skinnyjeanso.com/live/"
B Communications protocol
K6.2 User-Agent … Tob 1.1
partly (appendix)
only in the appendix
B
K6.3 RC4 then base64
partly (body)
§5.7 channel table "Encryption · RC4 PRGA" on the HTTP channel (right purpose this time); base64 not stated (alphabet only in the appendix); key 12345 only in the appendix
B
K6.4 beacon interval
missed
—
B
K6.5 beacon format
found
§5.5 quotes the base format exactly, "counter=%d&type=%d&guid=%s&os=%d&arch=%d&username=%s&group=%lu&ver=%d.%d&up=%d&direction=%s", and says the recon results populate it. The registration additions (&computername=%s, &domain=%s) are only in the appendix
K7 commands. partly (body): 3 ("process lists" among the beacon data), 4 (the recon set, §5.5/§5.6, not tied to a
C2 command), 12 and 13 ("Drops and executes additional payloads or updates, potentially using dynamically generated
filenames and rundll32.exe"; %s%d.exe, %s%d.dll), 15 ("updates itself"), 18 (files/bp.dat named as a payload
string, not as IcedID). missed: 2 (&desklinks=[ only in the appendix), 14, 17, 19, 20. The §5.6
"Commands" table lists the discovery commands (K8), not the C2 command IDs.
K8 discovery: found. §5.5 lists whoami /groups, ipconfig /all, systeminfo, nltest /domain_trusts and
/all_trusts, net view /all and /all /domain, net group "Domain Admins" /domain, the SecurityCenter2 WMIC query and
(§5.6) net config workstation. Only the ifconfig.me public-IP lookup is missing.
K9 IOCs. found: own hashes (exact, incl. imphash); /live/ (in prose and the C2 table). partly (body):
update_data.dat. partly (appendix): mutex runnung, Custom_update\, Update_<hex>.dll (Update_%x), task Updater, the
User-Agent. None is in §9, which lists only the four hashes.
K10 ATT&CK. found: T1027 (procedure now "obfuscation … to hide its malicious behavior and strings"), T1053.005
(scheduled task), T1059.003 (cmd.exe recon). partly: T1218.011 (the parent T1218 is published for "LOLBin … rundll32"). missed:
T1055, T1070.004.
Build consistency. The two C2 domains skinnyjeanso.com and titnovacrion.top are both on B's list of 47; group
Littlehw is on B's list; RC4 key 12345 is the key B expects for a March 2024 build — all three consistent, but the last two
only in the appendix.
K11. The one draft rule is still the hash-or-imphash YARA. None of the decoded strings (UA, runnung,
Custom_update) made it into a rule.
Published (the /iocs endpoint and §9): 1 of 8 (the sample's own hashes). The STIX bundle additionally carries two
domain indicators, skinnyjeanso.com and titnovacrion.top (both on B's C2 list) — which the /iocs endpoint and §9 do
not (a disagreement between surfaces, fixed in iteration 2).
Stated in the report body: 3 of 8 (hashes, /live/, update_data.dat).
Present anywhere in the report, appendix included: 8 of 8.
Reverse direction: claims no human report supports¶
Claim (quoted)
Assessment
How we know
"The malware exfiltrates collected data to C2 servers"; "The critical risk is unauthorized data exfiltration"; "Immediate isolation … to prevent data loss"
unsupported as framed
B: the recon results are command 4's answer to the C2; the sample is a loader. Nothing is exfiltrated beyond host facts
"attempts to evade detection by querying security products via WMI" → T1012 Query Registry
contradicted
B Command ID 4: the AV query is discovery (T1518.001 in the key's derived mapping); WMI is not a registry query
"persistence by creating scheduled tasks and modifying registry Run keys"; judge: "registry run keys, startup folder shortcuts"
contradicted / disputed
B, E: the Updater task only; P's AutoRun key is K5.4 (disputed, not scored). Startup, Personal, Local AppData and the Shell Folders key are E's configurable install location (K5.5), not a startup shortcut
"&stiller=" read as a scheduled-task string
contradicted
B: &stiller= is the stealer-module beacon field (command 21)
"RC4 encryption to hide malicious capabilities and strings"
contradicted (purpose)
B: the strings use a rolling XOR; RC4 (key 12345) is the C2 traffic
"CRC32 hashing for data integrity or identification"
contradicted
B: CRC32 hashes DLL and API names
"T1027 (Indicator Removal from Host), specifically T1027.005 (Obfuscated Files or Information)"
contradicted (names swapped)
T1027 is Obfuscated Files or Information; the §8 matrix names them correctly
"Sysmon … processes with RC4 encryption API calls"
unsupported
RC4 is inline code
Severity: Critical
new (judgement)
no human report rates severity
"does not import network-related APIs … dynamically resolved"
correct but new
K3.5: wininet is loaded at run time
Unsigned; VT 52/75; compile time 2024-03-25 15:54:25; export name UpdaterTag.dll; exports at 0x3ce4
correct but new
measured; matches the key's header facts
Report defects seen in this run (platform, not model):
1. Citations to the wrong entry pass the validator. §4 steps 1–5, §5.2, §5.4, §5.6 and §5.7 cite ev_0011 (the
VirusTotal report) for strings that are in ev_0012 (FLOSS). The static analyst's own claims cite ev_0011 for the
decoded strings; the report inherits it. The citation check at the time verified that an id exists, not that the entry
holds the quoted fact.
2. Truncated evidence prose printed: §5.2 "… This suggests" and "… more suspicious tools like PowerShell di [ev_0011]"
(claim evidence cut mid-word and printed as a sentence).
3. The decoded C2 domains are in the STIX bundle but not in §9 or /iocs (4 hash rows only, include=all).
4. Two sections dropped: payloads ("reached the output cap of 900 tokens … a model's reasoning counts against it")
and configuration ("did not fit the schema after 1 retry") — the section that would have held the C2 pair, key
12345 and group Littlehw.