Overview

overview

10

Static

static

3

rRBVVlBwia.exe

windows7-x64

10

rRBVVlBwia.exe

windows10-2004-x64

10

Sharing

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General

  • Target

    rRBVVlBwia.exe

  • Size

    301KB

  • Sample

    240723-snfy4azand

  • MD5

    547d22725d299a21760e957f1522d03b

  • SHA1

    5fc9a7b3d3b118b38d1b76f33eba59ba3f49e33e

  • SHA256

    d99e41c304f50b2548a79f43cfea1de5d96ceb38b254ed8057b59ae190916200

  • SHA512

    ee486698fa1952464d08a9987679b2a28fc1d54cb9635ed92392f896368375f60ed139bc82ee846d35ea1f6ec409989a7aa9bbd1c39912fdbec15f375a0cb4ea

  • SSDEEP

    3072:eMbOOm6/FBMTUrZXzYzRbWW2DA6mMY0bX2pk0Bhi25P3SSklv9ATu:eMDLt5ZXkzRitDcMpbXMk0Dvx3kN9AT

Score
10/10
tofseediscoveryevasionexecutionpersistenceprivilege_escalationtrojan

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

jotunheim.name

Targets

    • Target

      rRBVVlBwia.exe

    • Size

      301KB

    • MD5

      547d22725d299a21760e957f1522d03b

    • SHA1

      5fc9a7b3d3b118b38d1b76f33eba59ba3f49e33e

    • SHA256

      d99e41c304f50b2548a79f43cfea1de5d96ceb38b254ed8057b59ae190916200

    • SHA512

      ee486698fa1952464d08a9987679b2a28fc1d54cb9635ed92392f896368375f60ed139bc82ee846d35ea1f6ec409989a7aa9bbd1c39912fdbec15f375a0cb4ea

    • SSDEEP

      3072:eMbOOm6/FBMTUrZXzYzRbWW2DA6mMY0bX2pk0Bhi25P3SSklv9ATu:eMDLt5ZXkzRitDcMpbXMk0Dvx3kN9AT

    Score
    10/10
    tofseediscoveryevasionexecutionpersistenceprivilege_escalationtrojan

    • 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 Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

System Services

1
T1569

Service Execution

1
T1569.002

Persistence

Boot or Logon Autostart Execution

1
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Create or Modify System Process

2
T1543

Windows Service

2
T1543.003

Event Triggered Execution

1
T1546

Netsh Helper DLL

1
T1546.007

Privilege Escalation

Boot or Logon Autostart Execution

1
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Create or Modify System Process

2
T1543

Windows Service

2
T1543.003

Event Triggered Execution

1
T1546

Netsh Helper DLL

1
T1546.007

Defense Evasion

Impair Defenses

2
T1562

Disable or Modify System Firewall

1
T1562.004

Disable or Modify Tools

1
T1562.001

Modify Registry

2
T1112

Credential Access

Discovery

Query Registry

1
T1012

System Information Discovery

2
T1082

System Location Discovery

1
T1614

System Language Discovery

1
T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Tasks