General

  • Target

    file.exe

  • Size

    301KB

  • Sample

    230206-ywj9daff77

  • MD5

    ae9dc34b6a8ea00485a79cc48fc59662

  • SHA1

    0e623ec7aaa91275e2fb0bcad85caa360b1fd296

  • SHA256

    3878ebdeaa9e027240ca37b48fc74c9d1f1e58e17708d33b050af65cc2ac66e1

  • SHA512

    a4dd1994fddd471c5ad4394e4c85f9f762bc4a82286d5e902fc5b837d7a9bc5c28e2098b802e21243d833e7b1f8fc6f154857f4712c721d0d1e25d383508a0ae

  • SSDEEP

    3072:CBLb6b6cLxMRGDLx1l9yy70oMh5KGlF2Lw9M4uQjiMTE5/3RbPafVi:C1ZcLxzR1/ooTfLw9BuQj9M3lPat

Malware Config

Extracted

Family

tofsee

C2

svartalfheim.top

jotunheim.name

Targets

    • Target

      file.exe

    • Size

      301KB

    • MD5

      ae9dc34b6a8ea00485a79cc48fc59662

    • SHA1

      0e623ec7aaa91275e2fb0bcad85caa360b1fd296

    • SHA256

      3878ebdeaa9e027240ca37b48fc74c9d1f1e58e17708d33b050af65cc2ac66e1

    • SHA512

      a4dd1994fddd471c5ad4394e4c85f9f762bc4a82286d5e902fc5b837d7a9bc5c28e2098b802e21243d833e7b1f8fc6f154857f4712c721d0d1e25d383508a0ae

    • SSDEEP

      3072:CBLb6b6cLxMRGDLx1l9yy70oMh5KGlF2Lw9M4uQjiMTE5/3RbPafVi:C1ZcLxzR1/ooTfLw9BuQj9M3lPat

    • Tofsee

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

    • Windows security bypass

    • xmrig

      XMRig is a high performance, open source, cross platform CPU/GPU miner.

    • XMRig Miner payload

    • Creates new service(s)

    • 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

    • Executes dropped EXE

    • Drops file in System32 directory

    • 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