tofsee | 38208d790e448fa4df63395c23dcb533dce491e0432a2870b335a8d66810fecc

Analysis

max time kernel
159s
max time network
168s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
09/02/2023, 16:25

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General

Target
file.exe
Size 185KB
Sample230209-twza3sbf71
SHA256 38208d790e448fa4df63395c23dcb533dce491e0432a2870b335a8d66810fecc
MD5 141359f4b3bd6bd1ec634f67408aa74b
SHA1 aa1fea38076eee0e61db520cf11d61008fcc8504
SHA512 cb857dbf3183b4e9cf1022d71c2e190587ff4961838cd1e6d62ad8794a4949b834e6c5f5ce0655ab1c4567fa19e393cebda7f88eaad9dde112724d0ed2dc6d9e
SSDEEP 3072:UfQyLPGWT40o4ZEy67k+YSVDdM1q3ZHAYl+V34BabNA:UfLd+4j67BDCHjzbN
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
Creates new service(s) 1 TTPs
persistence

New Service
T1050

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Modify Existing Service

T1031

pid	Process
3168	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\jehwnong\ImagePath = "C:\\Windows\\SysWOW64\\jehwnong\\cehsnhwx.exe"	svchost.exe

Checks computer location settings 2 TTPs 1 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation	file.exe

Executes dropped EXE 1 IoCs

pid	Process
2232	cehsnhwx.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2232 set thread context of 1224	2232	cehsnhwx.exe	93

Launches sc.exe 3 IoCs

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

pid	Process
4636	sc.exe
4360	sc.exe
4696	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 23 IoCs

description	pid	Process	procid_target
PID 5044 wrote to memory of 4940	5044	file.exe	79
PID 5044 wrote to memory of 4940	5044	file.exe	79
PID 5044 wrote to memory of 4940	5044	file.exe	79
PID 5044 wrote to memory of 556	5044	file.exe	81
PID 5044 wrote to memory of 556	5044	file.exe	81
PID 5044 wrote to memory of 556	5044	file.exe	81
PID 5044 wrote to memory of 4360	5044	file.exe	83
PID 5044 wrote to memory of 4360	5044	file.exe	83
PID 5044 wrote to memory of 4360	5044	file.exe	83
PID 5044 wrote to memory of 4696	5044	file.exe	85
PID 5044 wrote to memory of 4696	5044	file.exe	85
PID 5044 wrote to memory of 4696	5044	file.exe	85
PID 5044 wrote to memory of 4636	5044	file.exe	87
PID 5044 wrote to memory of 4636	5044	file.exe	87
PID 5044 wrote to memory of 4636	5044	file.exe	87
PID 5044 wrote to memory of 3168	5044	file.exe	90
PID 5044 wrote to memory of 3168	5044	file.exe	90
PID 5044 wrote to memory of 3168	5044	file.exe	90
PID 2232 wrote to memory of 1224	2232	cehsnhwx.exe	93
PID 2232 wrote to memory of 1224	2232	cehsnhwx.exe	93
PID 2232 wrote to memory of 1224	2232	cehsnhwx.exe	93
PID 2232 wrote to memory of 1224	2232	cehsnhwx.exe	93
PID 2232 wrote to memory of 1224	2232	cehsnhwx.exe	93

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:5044
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\jehwnong\
  2⤵
  PID:4940
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\cehsnhwx.exe" C:\Windows\SysWOW64\jehwnong\
  2⤵
  PID:556
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create jehwnong binPath= "C:\Windows\SysWOW64\jehwnong\cehsnhwx.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:4360
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description jehwnong "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:4696
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start jehwnong
  2⤵
  - Launches sc.exe
  PID:4636
- 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:3168

C:\Windows\SysWOW64\jehwnong\cehsnhwx.exe
C:\Windows\SysWOW64\jehwnong\cehsnhwx.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2232
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  PID:1224

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

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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cehsnhwx.exe

Path C:\Users\Admin\AppData\Local\Temp\cehsnhwx.exe
Size 12.9MB
SHA256 e36a26be32bcf248926a7bb1173eac35e85fce87d46cea8aefa289cf7f1e3f6c
MD5 30acc73fbc091894f0a4e98b32213cc5
SHA1 9b57c51959e56fedf3bf913b828615eb94c03d33
SHA512 c9f9940bf8f314f4ccd44b043cffcbe0372f6a2fb78248e993a21bcd704c7f2a1392e810620e9d0fd3ee5dbd6da151da70980416884d3ced7356227164474617
SSDEEP 6144:KfLd+4j67BDCHjzbN6666666666666666666666666666666666666666666666K:KfVj67ZCH
MD5 SHA1 SHA512 SSDEEP

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cehsnhwx.exe

Path C:\Windows\SysWOW64\jehwnong\cehsnhwx.exe
Size 12.9MB
SHA256 e36a26be32bcf248926a7bb1173eac35e85fce87d46cea8aefa289cf7f1e3f6c
MD5 30acc73fbc091894f0a4e98b32213cc5
SHA1 9b57c51959e56fedf3bf913b828615eb94c03d33
SHA512 c9f9940bf8f314f4ccd44b043cffcbe0372f6a2fb78248e993a21bcd704c7f2a1392e810620e9d0fd3ee5dbd6da151da70980416884d3ced7356227164474617
SSDEEP 6144:KfLd+4j67BDCHjzbN6666666666666666666666666666666666666666666666K:KfVj67ZCH
MD5 SHA1 SHA512 SSDEEP

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memory/1224-147-0x0000000000110000-0x0000000000125000-memory.dmp

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memory/1224-153-0x0000000000110000-0x0000000000125000-memory.dmp

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memory/1224-152-0x0000000000110000-0x0000000000125000-memory.dmp

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memory/2232-148-0x0000000000799000-0x00000000007AB000-memory.dmp

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memory/2232-144-0x0000000000799000-0x00000000007AB000-memory.dmp

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memory/2232-145-0x0000000000400000-0x000000000055E000-memory.dmp

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memory/2232-150-0x0000000000400000-0x000000000055E000-memory.dmp

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memory/5044-133-0x00000000007FD000-0x0000000000810000-memory.dmp

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memory/5044-143-0x0000000000400000-0x000000000055E000-memory.dmp

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memory/5044-135-0x0000000000400000-0x000000000055E000-memory.dmp

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memory/5044-134-0x00000000006E0000-0x00000000006F3000-memory.dmp

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Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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