Overview

overview

10

Static

static

3

vyrcclmm.exe

windows7-x64

10

vyrcclmm.exe

windows10-2004-x64

10

Sharing

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General

  • Target

    vyrcclmm.exe

  • Size

    10.4MB

  • Sample

    240706-hzc2gasepg

  • MD5

    52d6521fdf86ef42b47afa05bf06225f

  • SHA1

    ffe1dca080b60cac20e6d2dcba807388badde68f

  • SHA256

    039bcb175a6042892395691ef543d82135ff3e0542cc18a30b791d20d205b966

  • SHA512

    9d70674d23ad82d1210b7cfd755f7aa5a590883bcddbb18a54e5a53706b642d606c0244c3d9b97ee93615d80d72a51e9e69241a48bd98a222a757244551a350a

  • SSDEEP

    98304:Gqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqv:

Score
10/10
tofseeevasionexecutionpersistenceprivilege_escalationtrojan

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

jotunheim.name

Targets

    • Target

      vyrcclmm.exe

    • Size

      10.4MB

    • MD5

      52d6521fdf86ef42b47afa05bf06225f

    • SHA1

      ffe1dca080b60cac20e6d2dcba807388badde68f

    • SHA256

      039bcb175a6042892395691ef543d82135ff3e0542cc18a30b791d20d205b966

    • SHA512

      9d70674d23ad82d1210b7cfd755f7aa5a590883bcddbb18a54e5a53706b642d606c0244c3d9b97ee93615d80d72a51e9e69241a48bd98a222a757244551a350a

    • SSDEEP

      98304:Gqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqv:

    Score
    10/10
    tofseeevasionexecutionpersistenceprivilege_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

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Tasks