General

  • Target

    file.exe

  • Size

    300KB

  • Sample

    230206-zle3cafg99

  • MD5

    8ba26140aec7702f27a18eb7e9238fe9

  • SHA1

    3e5b466368a5077dc9b938ea45642331986f8827

  • SHA256

    e764480dd6acba37e913e3e907d44f5f912c56c067caf5118101aaa12445bbbd

  • SHA512

    eb48d8a92dd494fc421f42910f9185eae2464e97b1c2932f76aa97810dded8ae9f007e81ad5cdb43b58bd08509efa1e4c1b697f098008e1887086be37bbd5d79

  • SSDEEP

    3072:CRwb6b2PyLhUGRG/ukjNP99fTP5YTt/BuQjiMTE5B5Eafj:Cy1PyLW1WkjNV9fL2TFBuQj9wEa

Malware Config

Extracted

Family

tofsee

C2

svartalfheim.top

jotunheim.name

Targets

    • Target

      file.exe

    • Size

      300KB

    • MD5

      8ba26140aec7702f27a18eb7e9238fe9

    • SHA1

      3e5b466368a5077dc9b938ea45642331986f8827

    • SHA256

      e764480dd6acba37e913e3e907d44f5f912c56c067caf5118101aaa12445bbbd

    • SHA512

      eb48d8a92dd494fc421f42910f9185eae2464e97b1c2932f76aa97810dded8ae9f007e81ad5cdb43b58bd08509efa1e4c1b697f098008e1887086be37bbd5d79

    • SSDEEP

      3072:CRwb6b2PyLhUGRG/ukjNP99fTP5YTt/BuQjiMTE5B5Eafj:Cy1PyLW1WkjNV9fL2TFBuQj9wEa

    • 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