Overview

overview

10

Static

static

3

efc1bfdb59...da.exe

windows7-x64

10

efc1bfdb59...da.exe

windows10-2004-x64

10

Sharing

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General

  • Target

    efc1bfdb596061a2e27ec7924fbdcb70acf8c896d615c077988df5114042ebda

  • Size

    13.1MB

  • Sample

    240506-lbxbzsff3v

  • MD5

    bd09867a761f2cf6666ba7d8a7aae353

  • SHA1

    35ae2f285c46a88fe920ed261ca30b47a1c5050d

  • SHA256

    efc1bfdb596061a2e27ec7924fbdcb70acf8c896d615c077988df5114042ebda

  • SHA512

    c1bebbe5bdee67e71c4bc7aade6c3fbfab29083e54794750fb2fe56387c7e58d95febacf1202cbff5ede1793549879248e95043f31f771971f85cbff61fff4e1

  • SSDEEP

    49152:BDY000000000000000000000000000000000000000000000000000000000000H:BD

Score
10/10
tofseeevasionexecutionpersistencetrojan

Malware Config

Extracted

Family

tofsee

C2

svartalfheim.top

jotunheim.name

Targets

    • Target

      efc1bfdb596061a2e27ec7924fbdcb70acf8c896d615c077988df5114042ebda

    • Size

      13.1MB

    • MD5

      bd09867a761f2cf6666ba7d8a7aae353

    • SHA1

      35ae2f285c46a88fe920ed261ca30b47a1c5050d

    • SHA256

      efc1bfdb596061a2e27ec7924fbdcb70acf8c896d615c077988df5114042ebda

    • SHA512

      c1bebbe5bdee67e71c4bc7aade6c3fbfab29083e54794750fb2fe56387c7e58d95febacf1202cbff5ede1793549879248e95043f31f771971f85cbff61fff4e1

    • SSDEEP

      49152:BDY000000000000000000000000000000000000000000000000000000000000H:BD

    Score
    10/10
    tofseeevasionexecutionpersistencetrojan

    • Tofsee

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

      trojantofsee

    • Windows security bypass

      evasiontrojan

    • Creates new service(s)

      persistenceexecution

    • Modifies Windows Firewall

      evasion

    • Sets service image path in registry

      persistence

    • Checks computer location settings

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

    • Deletes itself

    • Executes dropped EXE

    • Looks up external IP address via web service

      Uses a legitimate IP lookup service to find the infected system's external IP.

    • Drops file in System32 directory

    • Suspicious use of SetThreadContext

    behavioral1behavioral2

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

System Services

1
T1569

Service Execution

1
T1569.002

Persistence

Create or Modify System Process

2
T1543

Windows Service

2
T1543.003

Boot or Logon Autostart Execution

1
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Privilege Escalation

Create or Modify System Process

2
T1543

Windows Service

2
T1543.003

Boot or Logon Autostart Execution

1
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Defense Evasion

Impair Defenses

2
T1562

Disable or Modify Tools

1
T1562.001

Disable or Modify System Firewall

1
T1562.004

Modify Registry

2
T1112

Credential Access

Discovery

Query Registry

1
T1012

System Information Discovery

2
T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Tasks