tofsee | fbfa59e2686bcb8851673a367c996d6f5e84cc991e96fe9bf42ff77d29e53a08

Analysis

max time kernel
146s
max time network
140s
platform
windows7_x64
resource
win7-20220901-en
resource tags

arch:x64arch:x86image:win7-20220901-enlocale:en-usos:windows7-x64system
submitted
14/11/2022, 04:28

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General

Target
file.exe
Size 154KB
Sample221114-e3netshh5s
SHA256 fbfa59e2686bcb8851673a367c996d6f5e84cc991e96fe9bf42ff77d29e53a08
MD5 7aee623797b2172be27966085f415138
SHA1 1487d608ac3c1fe20c91b84e4a3671383e0e0039
SHA512 b606efd6c6120af5ae83132127961cf4bb2d81263eb92dce607502436d0eaffb9930b139b08a4c65d874afac50fb322e5a5169814b343d4003aa4ab836c7ecc8
SSDEEP 3072:wX4LYl6Djq5nLjGaTI/xpaEQvRZ9kVE7GYbnjlY:vLYl6DOfFTI/+bJk27
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

svartalfheim.top
jotunheim.name

Signatures

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

Windows security bypass 2 TTPs 1 IoCs

evasion trojan

Disabling Security Tools

T1089

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Windows\SysWOW64\gsryyztb = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

New Service
T1050

Executes dropped EXE 1 IoCs

pid	Process
1376	gwylcuf.exe

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Modify Existing Service

T1031

pid	Process
1096	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\gsryyztb\ImagePath = "C:\\Windows\\SysWOW64\\gsryyztb\\gwylcuf.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
988	svchost.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1376 set thread context of 988	1376	gwylcuf.exe	40

Launches sc.exe 3 IoCs

Sc.exe is a Windows utlilty to control services on the system.

pid	Process
1132	sc.exe
1524	sc.exe
1596	sc.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 1204 wrote to memory of 1088	1204	file.exe	27
PID 1204 wrote to memory of 1088	1204	file.exe	27
PID 1204 wrote to memory of 1088	1204	file.exe	27
PID 1204 wrote to memory of 1088	1204	file.exe	27
PID 1204 wrote to memory of 276	1204	file.exe	29
PID 1204 wrote to memory of 276	1204	file.exe	29
PID 1204 wrote to memory of 276	1204	file.exe	29
PID 1204 wrote to memory of 276	1204	file.exe	29
PID 1204 wrote to memory of 1132	1204	file.exe	31
PID 1204 wrote to memory of 1132	1204	file.exe	31
PID 1204 wrote to memory of 1132	1204	file.exe	31
PID 1204 wrote to memory of 1132	1204	file.exe	31
PID 1204 wrote to memory of 1524	1204	file.exe	33
PID 1204 wrote to memory of 1524	1204	file.exe	33
PID 1204 wrote to memory of 1524	1204	file.exe	33
PID 1204 wrote to memory of 1524	1204	file.exe	33
PID 1204 wrote to memory of 1596	1204	file.exe	35
PID 1204 wrote to memory of 1596	1204	file.exe	35
PID 1204 wrote to memory of 1596	1204	file.exe	35
PID 1204 wrote to memory of 1596	1204	file.exe	35
PID 1204 wrote to memory of 1096	1204	file.exe	38
PID 1204 wrote to memory of 1096	1204	file.exe	38
PID 1204 wrote to memory of 1096	1204	file.exe	38
PID 1204 wrote to memory of 1096	1204	file.exe	38
PID 1376 wrote to memory of 988	1376	gwylcuf.exe	40
PID 1376 wrote to memory of 988	1376	gwylcuf.exe	40
PID 1376 wrote to memory of 988	1376	gwylcuf.exe	40
PID 1376 wrote to memory of 988	1376	gwylcuf.exe	40
PID 1376 wrote to memory of 988	1376	gwylcuf.exe	40
PID 1376 wrote to memory of 988	1376	gwylcuf.exe	40

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1204
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\gsryyztb\
  2⤵
  PID:1088
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\gwylcuf.exe" C:\Windows\SysWOW64\gsryyztb\
  2⤵
  PID:276
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create gsryyztb binPath= "C:\Windows\SysWOW64\gsryyztb\gwylcuf.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:1132
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description gsryyztb "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:1524
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start gsryyztb
  2⤵
  - Launches sc.exe
  PID:1596
- C:\Windows\SysWOW64\netsh.exe
  "C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
  2⤵
  - Modifies Windows Firewall
  PID:1096

C:\Windows\SysWOW64\gsryyztb\gwylcuf.exe
C:\Windows\SysWOW64\gsryyztb\gwylcuf.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1376
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Windows security bypass
  - Sets service image path in registry
  - Deletes itself
  PID:988

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Modify Existing Service

T1031

New Service

T1050

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

New Service

T1050

Defense Evasion

Disabling Security Tools

T1089

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

gwylcuf.exe

Path C:\Users\Admin\AppData\Local\Temp\gwylcuf.exe
Size 10.1MB
SHA256 590f8b07f87e23eede6a6039e00a2153224bbea866232c3bab80223b665820d5
MD5 0ad672f7c8cf3bc9767fb7ee94168b5b
SHA1 6924bb6b7ae336e4c9e7e29d52c91db0e0562dfc
SHA512 bb059aeccc68eb927ad0f21dc9e49ee37141070d89160c805d0bf1c73996bd818f7bb1d3470a52c869e83861074d6801c3c2e59055a81037d342f54cbc9a02da
SSDEEP 3072:6X4LYl6Djq5nLjGaTI/xpaEQvRZ9kVE7GYbnjlYPjlYPjlYPjlYPjlYPjlYPjlYy:BLYl6DOfFTI/+bJk27
MD5 SHA1 SHA512 SSDEEP

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gwylcuf.exe

Path C:\Windows\SysWOW64\gsryyztb\gwylcuf.exe
Size 10.1MB
SHA256 590f8b07f87e23eede6a6039e00a2153224bbea866232c3bab80223b665820d5
MD5 0ad672f7c8cf3bc9767fb7ee94168b5b
SHA1 6924bb6b7ae336e4c9e7e29d52c91db0e0562dfc
SHA512 bb059aeccc68eb927ad0f21dc9e49ee37141070d89160c805d0bf1c73996bd818f7bb1d3470a52c869e83861074d6801c3c2e59055a81037d342f54cbc9a02da
SSDEEP 3072:6X4LYl6Djq5nLjGaTI/xpaEQvRZ9kVE7GYbnjlYPjlYPjlYPjlYPjlYPjlYPjlYy:BLYl6DOfFTI/+bJk27
MD5 SHA1 SHA512 SSDEEP

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memory/988-80-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/988-79-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/988-71-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/988-69-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/1204-57-0x0000000000220000-0x0000000000233000-memory.dmp

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memory/1204-66-0x000000000065B000-0x000000000066C000-memory.dmp

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memory/1204-67-0x0000000000400000-0x000000000058C000-memory.dmp

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memory/1204-56-0x000000000065B000-0x000000000066C000-memory.dmp

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memory/1204-54-0x0000000074DE1000-0x0000000074DE3000-memory.dmp

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memory/1204-58-0x0000000000400000-0x000000000058C000-memory.dmp

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memory/1376-74-0x000000000062B000-0x000000000063C000-memory.dmp

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memory/1376-76-0x0000000000400000-0x000000000058C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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