Threat Actor: TA577
TA577 is classified as an advanced Malware-as-a-Service Operator originating primarily from Eastern Europe Cybercrime. Driven by operational objectives spanning phishing-as-a-service, thread-hijacked emails & initial access drop, this threat entity has maintained an active footprint from 2020 - Present. In enterprise telemetry and malware repository classification, TA577 has been corroborated across 2 distinct malware families with over 2,608 validated sample hashes.
Operational Threat Profile & Targeting
| Known Aliases | Threat Actor 577, Pikabot Affiliate Network |
|---|---|
| Targeted Sectors | Corporate Enterprise, Financial Services, Manufacturing |
| Primary Motivations | Phishing-as-a-Service, Thread-Hijacked Emails & Initial Access Drop |
| Dominant Payload Categories | Loader · Banking Trojan |
| MITRE ATT&CK Reference | https://attack.mitre.org/groups/G0140/ ↗ |
Primary Observed MITRE ATT&CK Tradecraft
The following offensive techniques have been empirically verified across implants and campaign tooling weaponized by TA577:
T1566.001— weaponized across 2 catalog payload(s)T1055— weaponized across 2 catalog payload(s)T1071.001— weaponized across 2 catalog payload(s)T1027— weaponized across 1 catalog payload(s)T1082— weaponized across 1 catalog payload(s)T1105— weaponized across 1 catalog payload(s)T1078— weaponized across 1 catalog payload(s)T1185— weaponized across 1 catalog payload(s)T1003.001— weaponized across 1 catalog payload(s)T1021.002— weaponized across 1 catalog payload(s)
Exploited Vulnerabilities (CVEs)
Telemetry confirms TA577 has actively weaponized the following Common Vulnerabilities and Exposures in enterprise intrusions:
- CVE-2020-1472 — Technical Dossier & Exploitation Analysis (NVD ↗)
- CVE-2021-40444 — Technical Dossier & Exploitation Analysis (NVD ↗)
- CVE-2022-30190 — Technical Dossier & Exploitation Analysis (NVD ↗)
- CVE-2023-38831 — Technical Dossier & Exploitation Analysis (NVD ↗)
Attributed Catalog Malware Families (2 Families)
The following malware implants in the SystemHelpDesk catalog have been verified in operational campaigns attributed to TA577:
| Family | Category | Sample Count | Technical Summary |
|---|---|---|---|
| qbot | Banking Trojan | 1,758 | QakBot (widely referenced as Qbot or Pinkslipbot) is an aggressive, modular banking trojan and malware loader that operated for over 16 years, emerging around 2... |
| pikabot | Loader | 850 | Pikabot is an evasive, modular malware loader that emerged in early 2023, widely recognized by threat intelligence analysts as one of the primary successors to ... |
SOC Hardening & Defensive Containment
Defending enterprise perimeters against campaigns staged by TA577 requires defense-in-depth posture enforcement:
- Egress Filtering & C2 Interception: Enforce strict egress inspection and block communication to unclassified external IP blocks, fast-flux proxy relays, and dynamic DNS providers.
- Credential Isolation & Privileged Access Management: Enforce FIDO2 hardware MFA across all administrative and VPN entry points to prevent session token hijacking and password reuse.
- Attack Surface Reduction & Patch Velocity: Prioritize remediation of public-facing edge network appliances (VPN concentrators, web servers, file transfer appliances).