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TA577 is a Russia-based cybercrime threat actor active since at least 2020 and also known as the TR botnet. It is a prolific phishing operator and initial-access facilitator that conducts high-volume, broadly targeted email campaigns across geographies and industry sectors. TA577 has delivered QakBot, IcedID, SystemBC, SmokeLoader, Ursnif, Cobalt Strike, Pikabot, DarkGate, and Latrodectus. The actor was a major QakBot affiliate before the botnet’s disruption and has been linked to follow-on ransomware infections, including Black Basta and a Sodinokibi incident. TA577 commonly uses malicious attachments and links, including OneNote files, ZIP archives, LNK files, HTML files, JavaScript, HTA, batch scripts, and embedded DLL execution chains. It has used thread hijacking and social-engineering lures to increase phishing credibility. In February 2024, TA577 conducted campaigns in which customized HTML attachments initiated outbound SMB authentication attempts to capture NTLMv2 challenge-response material rather than directly installing malware. The group also uses obfuscation, archive-based delivery, signed-binary proxy execution, and other techniques intended to reduce detection and establish or broker initial access for subsequent criminal operations.
Mallory correlates actor tradecraft and target patterns against your stack, your sector, and your geography. See overlap before they land.
Who, where, and (when attributed) which flag flies behind the operation. Pulled from open-source reporting and Mallory's analyst review.
Sectors the actor has been observed targeting.
Attributed origin per open-source reporting.
49 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
11 malware families attributed to this actor across reporting.
6 additional families tracked in Mallory.
1 CVE this actor has used in observed campaigns. 1 of them exploited in the wild.
255 indicators attributed to this actor: domains, IPs, hashes, and other artifacts pulled from reporting. View more in app.
20 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
TA577 is listed in the detection's annotations.
Referenced only as an annotated actor associated with the detection technique.
Listed as an associated threat actor for the JavaScript-execution technique.
Referenced as one of the threat actors using the DarkGate MaaS loader/RAT.
Match sector + geo + tech-stack targeting against your real footprint.
Every observed MITRE ATT&CK technique, grouped by tactic.
Families this actor is known to deploy, with IOCs and behavior.
CVEs this actor has used in known campaigns.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Domains, IPs, and hashes tied to this actor, refreshed continuously.