tofsee | fbfa59e2686bcb8851673a367c996d6f5e84cc991e96fe9bf42ff77d29e53a08

Analysis

max time kernel
150s
max time network
148s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-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
Creates new service(s) 1 TTPs
persistence

New Service
T1050

Executes dropped EXE 1 IoCs

pid	Process
4044	mpyjjffc.exe

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Modify Existing Service

T1031

pid	Process
1468	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\jsnepewc\ImagePath = "C:\\Windows\\SysWOW64\\jsnepewc\\mpyjjffc.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

Drops file in System32 directory 1 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\config\systemprofile:.repos	svchost.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4044 set thread context of 4072	4044	mpyjjffc.exe	96

Launches sc.exe 3 IoCs

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

pid	Process
5012	sc.exe
5088	sc.exe
4068	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
2128	460	WerFault.exe	79
208	4044	WerFault.exe	90

Modifies data under HKEY_USERS 2 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\.DEFAULT\Control Panel\Buses	svchost.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Control Panel\Buses\Config0 = 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	svchost.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 460 wrote to memory of 1660	460	file.exe	80
PID 460 wrote to memory of 1660	460	file.exe	80
PID 460 wrote to memory of 1660	460	file.exe	80
PID 460 wrote to memory of 4376	460	file.exe	82
PID 460 wrote to memory of 4376	460	file.exe	82
PID 460 wrote to memory of 4376	460	file.exe	82
PID 460 wrote to memory of 5012	460	file.exe	84
PID 460 wrote to memory of 5012	460	file.exe	84
PID 460 wrote to memory of 5012	460	file.exe	84
PID 460 wrote to memory of 5088	460	file.exe	86
PID 460 wrote to memory of 5088	460	file.exe	86
PID 460 wrote to memory of 5088	460	file.exe	86
PID 460 wrote to memory of 4068	460	file.exe	88
PID 460 wrote to memory of 4068	460	file.exe	88
PID 460 wrote to memory of 4068	460	file.exe	88
PID 460 wrote to memory of 1468	460	file.exe	91
PID 460 wrote to memory of 1468	460	file.exe	91
PID 460 wrote to memory of 1468	460	file.exe	91
PID 4044 wrote to memory of 4072	4044	mpyjjffc.exe	96
PID 4044 wrote to memory of 4072	4044	mpyjjffc.exe	96
PID 4044 wrote to memory of 4072	4044	mpyjjffc.exe	96
PID 4044 wrote to memory of 4072	4044	mpyjjffc.exe	96
PID 4044 wrote to memory of 4072	4044	mpyjjffc.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:460
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\jsnepewc\
  2⤵
  PID:1660
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\mpyjjffc.exe" C:\Windows\SysWOW64\jsnepewc\
  2⤵
  PID:4376
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create jsnepewc binPath= "C:\Windows\SysWOW64\jsnepewc\mpyjjffc.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:5012
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description jsnepewc "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:5088
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start jsnepewc
  2⤵
  - Launches sc.exe
  PID:4068
- 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:1468
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 460 -s 1040
  2⤵
  - Program crash
  PID:2128

C:\Windows\SysWOW64\jsnepewc\mpyjjffc.exe
C:\Windows\SysWOW64\jsnepewc\mpyjjffc.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4044
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Drops file in System32 directory
  - Modifies data under HKEY_USERS
  PID:4072
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4044 -s 552
  2⤵
  - Program crash
  PID:208

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 460 -ip 460
1⤵
PID:4272

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 4044 -ip 4044
1⤵
PID:1888

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

mpyjjffc.exe

Path C:\Users\Admin\AppData\Local\Temp\mpyjjffc.exe
Size 12.1MB
SHA256 295b1660b7c7a67a04a11dd979953003610ccb6e9644bea5d5dac0beac9e4232
MD5 d77a6733982694e4a0941c660e7bd90d
SHA1 04824950bc45cfaf83302365914dd1550435709a
SHA512 6babef4f144c53df3822a191cb68cadf9d001cac7aa3669c27a63979225d2abee1bdf2e8c69c0edb86a317a8883f52176a1385bacb59cb24af676c957ce7a11a
SSDEEP 3072:iX4LYl6Djq5nLjGaTI/xpaEQvRZ9kVE7GYbnjlYPjlYPjlYPjlYPjlYPjlYPjlY/:JLYl6DOfFTI/+bJk27
MD5 SHA1 SHA512 SSDEEP

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mpyjjffc.exe

Path C:\Windows\SysWOW64\jsnepewc\mpyjjffc.exe
Size 12.1MB
SHA256 295b1660b7c7a67a04a11dd979953003610ccb6e9644bea5d5dac0beac9e4232
MD5 d77a6733982694e4a0941c660e7bd90d
SHA1 04824950bc45cfaf83302365914dd1550435709a
SHA512 6babef4f144c53df3822a191cb68cadf9d001cac7aa3669c27a63979225d2abee1bdf2e8c69c0edb86a317a8883f52176a1385bacb59cb24af676c957ce7a11a
SSDEEP 3072:iX4LYl6Djq5nLjGaTI/xpaEQvRZ9kVE7GYbnjlYPjlYPjlYPjlYPjlYPjlYPjlY/:JLYl6DOfFTI/+bJk27
MD5 SHA1 SHA512 SSDEEP

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memory/460-144-0x0000000000400000-0x000000000058C000-memory.dmp

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memory/460-133-0x00000000022C0000-0x00000000022D3000-memory.dmp

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memory/460-134-0x0000000000400000-0x000000000058C000-memory.dmp

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memory/460-143-0x0000000000729000-0x000000000073A000-memory.dmp

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memory/460-132-0x0000000000729000-0x000000000073A000-memory.dmp

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memory/4044-150-0x0000000000400000-0x000000000058C000-memory.dmp

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memory/4044-149-0x0000000000843000-0x0000000000854000-memory.dmp

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memory/4072-146-0x0000000000960000-0x0000000000975000-memory.dmp

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memory/4072-151-0x0000000000960000-0x0000000000975000-memory.dmp

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memory/4072-152-0x0000000000960000-0x0000000000975000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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