General

  • Target

    file.exe

  • Size

    277KB

  • Sample

    221202-jwksksgf87

  • MD5

    c6d415401f056c763ed6f1cefe3076ff

  • SHA1

    abbb11a5864fff00cc3146c32004571dbd852cc1

  • SHA256

    54ef0321778d07db74c4f406549fe0ec1bd8bb928afa93eb74a547b1e76e4c27

  • SHA512

    126ec28005065c7b8c363c1d1b228ce620440a6d712965945520bc312ee72a9e7cf3f6590c9da221135a881ebe0a43e9dcf6ea1debbb3a24448d3ce295b8c0d6

  • SSDEEP

    6144:k2tLrHGAnNTpmp5kIm0HUvuwDCmgnSuiHuRjMgU:kEHHLNTpmpiIJ02jNRQg

Malware Config

Extracted

Family

tofsee

C2

svartalfheim.top

jotunheim.name

Targets

    • Target

      file.exe

    • Size

      277KB

    • MD5

      c6d415401f056c763ed6f1cefe3076ff

    • SHA1

      abbb11a5864fff00cc3146c32004571dbd852cc1

    • SHA256

      54ef0321778d07db74c4f406549fe0ec1bd8bb928afa93eb74a547b1e76e4c27

    • SHA512

      126ec28005065c7b8c363c1d1b228ce620440a6d712965945520bc312ee72a9e7cf3f6590c9da221135a881ebe0a43e9dcf6ea1debbb3a24448d3ce295b8c0d6

    • SSDEEP

      6144:k2tLrHGAnNTpmp5kIm0HUvuwDCmgnSuiHuRjMgU:kEHHLNTpmpiIJ02jNRQg

    • Tofsee

      Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

    • Windows security bypass

    • Creates new service(s)

    • Executes dropped EXE

    • Modifies Windows Firewall

    • Sets service image path in registry

    • Checks computer location settings

      Looks up country code configured in the registry, likely geofence.

    • Deletes itself

    • Suspicious use of SetThreadContext

MITRE ATT&CK Matrix ATT&CK v6

Persistence

New Service

1
T1050

Modify Existing Service

1
T1031

Registry Run Keys / Startup Folder

1
T1060

Privilege Escalation

New Service

1
T1050

Defense Evasion

Disabling Security Tools

1
T1089

Modify Registry

2
T1112

Discovery

Query Registry

1
T1012

System Information Discovery

2
T1082

Tasks