tofsee | 12c8a5d0074b51c3d799ef722a7d97e7e1490529064759ef5932e0e76f28bf7e

Analysis

max time kernel
201s
max time network
209s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
02/12/2022, 09:03

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General

Target
file.exe
Size 350KB
Sample221202-kz22psfc8s
SHA256 12c8a5d0074b51c3d799ef722a7d97e7e1490529064759ef5932e0e76f28bf7e
MD5 38e3f0f985ad66154c83f39a43c7b499
SHA1 c2082df23b60440e5e5661feab6001183c79c299
SHA512 c955c141ca47679985da8cce632d0bcc6572956d5a19918061afc64067acda98f180385837c302e0e76e0386a06db085175131ee52569a3fb324becf795a19ce
SSDEEP 6144:G3gLadmInlyjX3m3iCww4ek4NYpIlIwassuYQuRjMgU:Gw2dHcjX3m3iC9SEYpIlHaBpdRQg
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

Executes dropped EXE 1 IoCs

pid	Process
2300	twfqqmmj.exe

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Modify Existing Service

T1031

pid	Process
4656	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\pkdkkhpn\ImagePath = "C:\\Windows\\SysWOW64\\pkdkkhpn\\twfqqmmj.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-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	file.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2300 set thread context of 1772	2300	twfqqmmj.exe	96

Launches sc.exe 3 IoCs

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

pid	Process
1592	sc.exe
4620	sc.exe
2132	sc.exe

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

System Information Discovery
T1082

Program crash 2 IoCs

pid	pid_target	Process	procid_target
892	1660	WerFault.exe	79
3108	2300	WerFault.exe	94

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 1660 wrote to memory of 4080	1660	file.exe	80
PID 1660 wrote to memory of 4080	1660	file.exe	80
PID 1660 wrote to memory of 4080	1660	file.exe	80
PID 1660 wrote to memory of 4172	1660	file.exe	82
PID 1660 wrote to memory of 4172	1660	file.exe	82
PID 1660 wrote to memory of 4172	1660	file.exe	82
PID 1660 wrote to memory of 1592	1660	file.exe	85
PID 1660 wrote to memory of 1592	1660	file.exe	85
PID 1660 wrote to memory of 1592	1660	file.exe	85
PID 1660 wrote to memory of 4620	1660	file.exe	86
PID 1660 wrote to memory of 4620	1660	file.exe	86
PID 1660 wrote to memory of 4620	1660	file.exe	86
PID 1660 wrote to memory of 2132	1660	file.exe	88
PID 1660 wrote to memory of 2132	1660	file.exe	88
PID 1660 wrote to memory of 2132	1660	file.exe	88
PID 1660 wrote to memory of 4656	1660	file.exe	90
PID 1660 wrote to memory of 4656	1660	file.exe	90
PID 1660 wrote to memory of 4656	1660	file.exe	90
PID 2300 wrote to memory of 1772	2300	twfqqmmj.exe	96
PID 2300 wrote to memory of 1772	2300	twfqqmmj.exe	96
PID 2300 wrote to memory of 1772	2300	twfqqmmj.exe	96
PID 2300 wrote to memory of 1772	2300	twfqqmmj.exe	96
PID 2300 wrote to memory of 1772	2300	twfqqmmj.exe	96

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:1660
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\pkdkkhpn\
  2⤵
  PID:4080
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\twfqqmmj.exe" C:\Windows\SysWOW64\pkdkkhpn\
  2⤵
  PID:4172
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create pkdkkhpn binPath= "C:\Windows\SysWOW64\pkdkkhpn\twfqqmmj.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:1592
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description pkdkkhpn "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:4620
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start pkdkkhpn
  2⤵
  - Launches sc.exe
  PID:2132
- 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:4656
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1660 -s 888
  2⤵
  - Program crash
  PID:892

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 188 -p 1660 -ip 1660
1⤵
PID:4988

C:\Windows\SysWOW64\pkdkkhpn\twfqqmmj.exe
C:\Windows\SysWOW64\pkdkkhpn\twfqqmmj.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2300
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  PID:1772
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2300 -s 232
  2⤵
  - Program crash
  PID:3108

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 2300 -ip 2300
1⤵
PID:4220

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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Downloads

twfqqmmj.exe

Path C:\Users\Admin\AppData\Local\Temp\twfqqmmj.exe
Size 14.4MB
SHA256 9c7c21a542f2e6354e9fed5ef04dd94e4fb67440f60d3077af61764843dda113
MD5 cfe0d32714d1d9624ca2734455623b65
SHA1 85be4fe66ca00841e012326e099d576c5e5ad935
SHA512 9269bbee9a2b99cbf2eec9edd6b95a8d7dd191dbd5888ac630f26ac1c462ed221c409faa7d2c0b105863b2c9024d68659129b5f57e94916d2ee2ea1c8eb88781
SSDEEP 6144:23gLadmInlyjX3m3iCww4ek4NYpIlIwassuYQuRjMgU:2w2dHcjX3m3iC9SEYpIlHaBpdRQg
MD5 SHA1 SHA512 SSDEEP

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twfqqmmj.exe

Path C:\Windows\SysWOW64\pkdkkhpn\twfqqmmj.exe
Size 14.4MB
SHA256 9c7c21a542f2e6354e9fed5ef04dd94e4fb67440f60d3077af61764843dda113
MD5 cfe0d32714d1d9624ca2734455623b65
SHA1 85be4fe66ca00841e012326e099d576c5e5ad935
SHA512 9269bbee9a2b99cbf2eec9edd6b95a8d7dd191dbd5888ac630f26ac1c462ed221c409faa7d2c0b105863b2c9024d68659129b5f57e94916d2ee2ea1c8eb88781
SSDEEP 6144:23gLadmInlyjX3m3iCww4ek4NYpIlIwassuYQuRjMgU:2w2dHcjX3m3iC9SEYpIlHaBpdRQg
MD5 SHA1 SHA512 SSDEEP

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memory/1660-143-0x00000000005F7000-0x000000000060C000-memory.dmp

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memory/1660-133-0x0000000000580000-0x0000000000593000-memory.dmp

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memory/1660-134-0x0000000000400000-0x000000000045D000-memory.dmp

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memory/1660-132-0x00000000005F7000-0x000000000060C000-memory.dmp

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memory/1660-144-0x0000000000400000-0x000000000045D000-memory.dmp

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memory/1772-152-0x0000000000EE0000-0x0000000000EF5000-memory.dmp

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memory/1772-151-0x0000000000EE0000-0x0000000000EF5000-memory.dmp

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memory/1772-146-0x0000000000EE0000-0x0000000000EF5000-memory.dmp

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memory/2300-149-0x0000000000552000-0x0000000000567000-memory.dmp

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memory/2300-150-0x0000000000400000-0x000000000045D000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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