tofsee | 1c82cd32daa7d2c07074a4a35db8513cc6b40dcc7aa422063c4917aac097f9d1

Analysis

max time kernel
165s
max time network
176s
platform
windows10-2004_x64
resource
win10v2004-20221111-en
resource tags

arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
submitted
10/02/2023, 01:31

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General

Target
file.exe
Size 193KB
Sample230210-bxfw1sbc87
SHA256 1c82cd32daa7d2c07074a4a35db8513cc6b40dcc7aa422063c4917aac097f9d1
MD5 047d482252de83f612de11ec3b7275dc
SHA1 4c6e97fe6f97c9effd5cc02b8f8cfb15b707fb7e
SHA512 6671b354708432d2329ada86f3ba62fc18b32d9e0b21507b789c2e00e84321a51a133cc8421b46a297e352c55124f0028a1d6ba1faf39ac0df36332bd9318745
SSDEEP 3072:ZEmva8Ae4VvldR4PqZ7Kx/o4tihWFquhR6jMRO/hbXTOTLUruFqv:SmS85Y7RoqBKx/o4IW0ua8YOTLNI
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
2296	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\smpdjxqn\ImagePath = "C:\\Windows\\SysWOW64\\smpdjxqn\\tvyjeyno.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-1-5-21-4246620582-653642754-1174164128-1000\Control Panel\International\Geo\Nation	file.exe

Executes dropped EXE 1 IoCs

pid	Process
4088	tvyjeyno.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4088 set thread context of 1668	4088	tvyjeyno.exe	92

Launches sc.exe 3 IoCs

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

pid	Process
688	sc.exe
2276	sc.exe
3680	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
5040	1328	WerFault.exe	79
4068	4088	WerFault.exe	90

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 1328 wrote to memory of 4272	1328	file.exe	80
PID 1328 wrote to memory of 4272	1328	file.exe	80
PID 1328 wrote to memory of 4272	1328	file.exe	80
PID 1328 wrote to memory of 1548	1328	file.exe	82
PID 1328 wrote to memory of 1548	1328	file.exe	82
PID 1328 wrote to memory of 1548	1328	file.exe	82
PID 1328 wrote to memory of 688	1328	file.exe	84
PID 1328 wrote to memory of 688	1328	file.exe	84
PID 1328 wrote to memory of 688	1328	file.exe	84
PID 1328 wrote to memory of 2276	1328	file.exe	86
PID 1328 wrote to memory of 2276	1328	file.exe	86
PID 1328 wrote to memory of 2276	1328	file.exe	86
PID 1328 wrote to memory of 3680	1328	file.exe	88
PID 1328 wrote to memory of 3680	1328	file.exe	88
PID 1328 wrote to memory of 3680	1328	file.exe	88
PID 4088 wrote to memory of 1668	4088	tvyjeyno.exe	92
PID 4088 wrote to memory of 1668	4088	tvyjeyno.exe	92
PID 4088 wrote to memory of 1668	4088	tvyjeyno.exe	92
PID 4088 wrote to memory of 1668	4088	tvyjeyno.exe	92
PID 4088 wrote to memory of 1668	4088	tvyjeyno.exe	92
PID 1328 wrote to memory of 2296	1328	file.exe	93
PID 1328 wrote to memory of 2296	1328	file.exe	93
PID 1328 wrote to memory of 2296	1328	file.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:1328
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\smpdjxqn\
  2⤵
  PID:4272
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\tvyjeyno.exe" C:\Windows\SysWOW64\smpdjxqn\
  2⤵
  PID:1548
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create smpdjxqn binPath= "C:\Windows\SysWOW64\smpdjxqn\tvyjeyno.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:688
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description smpdjxqn "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:2276
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start smpdjxqn
  2⤵
  - Launches sc.exe
  PID:3680
- 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:2296
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1328 -s 1184
  2⤵
  - Program crash
  PID:5040

C:\Windows\SysWOW64\smpdjxqn\tvyjeyno.exe
C:\Windows\SysWOW64\smpdjxqn\tvyjeyno.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4088
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  PID:1668
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4088 -s 532
  2⤵
  - Program crash
  PID:4068

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 4088 -ip 4088
1⤵
PID:3548

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 492 -p 1328 -ip 1328
1⤵
PID:3616

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

tvyjeyno.exe

Path C:\Users\Admin\AppData\Local\Temp\tvyjeyno.exe
Size 10.5MB
SHA256 3e68488d7375ed71642089f62893400d5be9dd5988763ad07070022e4f7909c0
MD5 b745f22d0719bf69f4a305fafce7c29b
SHA1 bc9143314de7f4c99de7a71e3a82120ecac82bd6
SHA512 b33ce0a82623ca67155204ecc5e8cd15733abe308303c1c64ffe72a42c249bc2734f73a91683f6c5113ce880d3b5496ecf0df0a230417232fd81c75ce8441026
SSDEEP 6144:BmS85Y7RoqBKx/o4IW0ua8YOTLNIJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJP:BmSSYFoHx/o4yk
MD5 SHA1 SHA512 SSDEEP

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tvyjeyno.exe

Path C:\Windows\SysWOW64\smpdjxqn\tvyjeyno.exe
Size 10.5MB
SHA256 3e68488d7375ed71642089f62893400d5be9dd5988763ad07070022e4f7909c0
MD5 b745f22d0719bf69f4a305fafce7c29b
SHA1 bc9143314de7f4c99de7a71e3a82120ecac82bd6
SHA512 b33ce0a82623ca67155204ecc5e8cd15733abe308303c1c64ffe72a42c249bc2734f73a91683f6c5113ce880d3b5496ecf0df0a230417232fd81c75ce8441026
SSDEEP 6144:BmS85Y7RoqBKx/o4IW0ua8YOTLNIJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJP:BmSSYFoHx/o4yk
MD5 SHA1 SHA512 SSDEEP

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memory/1328-134-0x0000000000400000-0x0000000000560000-memory.dmp

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memory/1328-133-0x00000000006A0000-0x00000000006B3000-memory.dmp

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memory/1328-151-0x0000000000400000-0x0000000000560000-memory.dmp

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memory/1328-132-0x0000000000899000-0x00000000008AC000-memory.dmp

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memory/1328-145-0x0000000000899000-0x00000000008AC000-memory.dmp

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memory/1668-154-0x0000000000730000-0x0000000000745000-memory.dmp

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memory/1668-153-0x0000000000730000-0x0000000000745000-memory.dmp

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memory/1668-147-0x0000000000730000-0x0000000000745000-memory.dmp

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memory/4088-144-0x0000000000400000-0x0000000000560000-memory.dmp

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memory/4088-143-0x00000000006A0000-0x00000000006B3000-memory.dmp

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memory/4088-152-0x0000000000400000-0x0000000000560000-memory.dmp

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memory/4088-142-0x00000000007C3000-0x00000000007D6000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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