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APT41

16 rules7 findings

The APT41 dossier →

  1. Behaviour (ATT&CK technique)

    certutil used to download a remote file (T1105)

    Needs certutil, a download switch and an http(s) URL together; certutil hashing, encoding or CA administration does not match.

    APT-C-36 · APT10 · APT15 · APT18 · APT23 · APT27 · 76 more

    T1105conf 80SIGAQLXQL

  2. CVE exploitation

    CVE-2019-19781 exploitation attempt

    Keys on the distinctive part of the exploit request only (path traversal, exploit syntax in the query, an unusual parameter) — never on an endpoint the product serves in normal use. Needs raw request-URI logging (some web servers normalise ../ away). Scanners hitting the internet produce true-positive ATTEMPTS: correlate with sc-status / response size before declaring compromise.

    CVE-2019-19781 · APT29 · APT41 · Fox Kitten

    T1190conf 70SIGAQLXQL

  3. CVE exploitation

    CVE-2021-44228 exploitation attempt

    Keys on the distinctive part of the exploit request only (path traversal, exploit syntax in the query, an unusual parameter) — never on an endpoint the product serves in normal use. Needs raw request-URI logging (some web servers normalise ../ away). Scanners hitting the internet produce true-positive ATTEMPTS: correlate with sc-status / response size before declaring compromise.

    CVE-2021-44228 · APT35 · APT41 · BRONZE STARLIGHT · Sea Turtle · Water Sigbin

    T1190conf 70SIGAQLXQL

  4. Actor indicator sweep

    APT41 file hash indicators

    Every value is a skopnix indicator tied to APT41 with confidence >= 72 from >= 2 independent sources, warninglist-clean (reserved / CDN / cloud / scanners / top sites) — re-validate against last_seen before blocking.

    APT41

    T1204.002conf 72SIGAQLXQL

  5. Indicator

    Known-malicious file hash observed

    Matches only members of the skopnix reference set (high-confidence, multi-source, warninglist-clean, time-to-live bounded). Add RFC1918 and your known-good destinations to the exclusion building block.

    APT41 · blackbyte · Caliente Bandits · CeranaKeeper · DragonSpark · FIN7 · 19 more

    T1204.002conf 72AQL

  6. Indicator

    Malicious Hashes

    Matches only members of the skopnix reference set (high-confidence, multi-source, warninglist-clean, time-to-live bounded). Add RFC1918 and your known-good destinations to the exclusion building block.

    APT41 · blackbyte · Caliente Bandits · CeranaKeeper · DragonSpark · FIN7 · 19 more

    T1204.002conf 72AQL

  7. Indicator

    Execution of known malicious file 6943fbb194317d34…

    Scoped to one indicator with skopnix confidence 72/100 from 2 independent sources; checked against RFC1918/reserved space, CDN / cloud / scanner ranges and top-site lists (MISP warninglists), GreyNoise when enriched, and skopnix's benign-infrastructure list. Re-validate against last_seen before blocking: infrastructure is re-assigned.

    APT41

    T1204.002conf 72SIGXQL

How to deploy

SIGSigma

  1. 1.Convert for your SIEM with sigma-cli / pySigma, e.g. sigma convert -t splunk -p sysmon rule.yml.
  2. 2.Run it as a hunt first: every rule ships as status experimental.
  3. 3.Promote to an alert once a week of results is clean on your data.

Check · The processing pipeline must map the logsource (firewall, dns, proxy, webserver, process_creation) to your field names.

AQLIBM QRadar

  1. 1.Create the reference set from its spec (Reference Data API, or Admin > Reference Set Management) and schedule the skopnix feed load.
  2. 2.Paste the AQL into Log Activity > Advanced Search to hunt the last seven days.
  3. 3.For alerting, build the CRE rule from the test stack shown and exclude your known-good building block.

Check · Custom properties ("URL Host", "URL", "File Hash", "Process CommandLine") come from your DSMs and content extensions; rename them if yours differ.

XQLCortex XDR

  1. 1.Paste the XQL into Incident Response > Investigation > Query Builder > XQL Search.
  2. 2.To alert, save it as a Correlation Rule and set the MITRE tactic and technique printed with the rule.
  3. 3.Schedule it on the interval you hunt at; keep the fields stage for the alert's columns.

Check · CVE rules read PAN-OS URL logs (panw_ngfw_url_raw), which need the NGFW integration and, for HTTPS, decryption.