tofsee | ddf103dd98b64df13836f9c0dcd8c3ae2709f34d46d60fb0a270dab76248079e

Analysis

max time kernel
150s
max time network
157s
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, 19:37

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General

Target
file.exe
Size 185KB
Sample230209-ybtbjsaa94
SHA256 ddf103dd98b64df13836f9c0dcd8c3ae2709f34d46d60fb0a270dab76248079e
MD5 84a1b8fe28c3836f26b9f6068b9c8dc0
SHA1 2827eae4ec61818c0ffa0beffe43f36418e766de
SHA512 1c89946930d684914a494cb72031374a619ce1fd4a0990d67273b353fba4d03b7c4412407824dad5ef5e158b251cec32c6ed49ba62d896f0f3b82c84a43f24b1
SSDEEP 3072:XFgREn7JskF9fn+GegwMD8Fla53mzyHyWSqYja0gxow3vl0JvyL/NWKy9AiF:XFf7uwf+GeM8Trzyyq35xoKvexyD4Ky3
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
4816	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\iutbkroa\ImagePath = "C:\\Windows\\SysWOW64\\iutbkroa\\oumbgzq.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
4084	oumbgzq.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4084 set thread context of 32	4084	oumbgzq.exe	98

Launches sc.exe 3 IoCs

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

pid	Process
4996	sc.exe
2024	sc.exe
3428	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
3704	4752	WerFault.exe	81
3844	4084	WerFault.exe	92

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 4752 wrote to memory of 1696	4752	file.exe	82
PID 4752 wrote to memory of 1696	4752	file.exe	82
PID 4752 wrote to memory of 1696	4752	file.exe	82
PID 4752 wrote to memory of 3316	4752	file.exe	84
PID 4752 wrote to memory of 3316	4752	file.exe	84
PID 4752 wrote to memory of 3316	4752	file.exe	84
PID 4752 wrote to memory of 4996	4752	file.exe	86
PID 4752 wrote to memory of 4996	4752	file.exe	86
PID 4752 wrote to memory of 4996	4752	file.exe	86
PID 4752 wrote to memory of 2024	4752	file.exe	88
PID 4752 wrote to memory of 2024	4752	file.exe	88
PID 4752 wrote to memory of 2024	4752	file.exe	88
PID 4752 wrote to memory of 3428	4752	file.exe	90
PID 4752 wrote to memory of 3428	4752	file.exe	90
PID 4752 wrote to memory of 3428	4752	file.exe	90
PID 4752 wrote to memory of 4816	4752	file.exe	93
PID 4752 wrote to memory of 4816	4752	file.exe	93
PID 4752 wrote to memory of 4816	4752	file.exe	93
PID 4084 wrote to memory of 32	4084	oumbgzq.exe	98
PID 4084 wrote to memory of 32	4084	oumbgzq.exe	98
PID 4084 wrote to memory of 32	4084	oumbgzq.exe	98
PID 4084 wrote to memory of 32	4084	oumbgzq.exe	98
PID 4084 wrote to memory of 32	4084	oumbgzq.exe	98

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:4752
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\iutbkroa\
  2⤵
  PID:1696
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\oumbgzq.exe" C:\Windows\SysWOW64\iutbkroa\
  2⤵
  PID:3316
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create iutbkroa binPath= "C:\Windows\SysWOW64\iutbkroa\oumbgzq.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:4996
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description iutbkroa "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:2024
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start iutbkroa
  2⤵
  - Launches sc.exe
  PID:3428
- 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:4816
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4752 -s 1204
  2⤵
  - Program crash
  PID:3704

C:\Windows\SysWOW64\iutbkroa\oumbgzq.exe
C:\Windows\SysWOW64\iutbkroa\oumbgzq.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4084
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  PID:32
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4084 -s 516
  2⤵
  - Program crash
  PID:3844

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4752 -ip 4752
1⤵
PID:3532

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 4084 -ip 4084
1⤵
PID:224

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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oumbgzq.exe

Path C:\Users\Admin\AppData\Local\Temp\oumbgzq.exe
Size 10.6MB
SHA256 a14a942cf536f8489a8e04163c04616532b476fb4e03dc49939864cbf3cb11c8
MD5 945382fb2de0c57ded86acecfb583229
SHA1 6d6a1c7abd9bf0a3a89e50847f7a379994b49e03
SHA512 9547b7379db580cc76841703912c239896ad11c8b66148af9aa7a66031c391aae93c2493d7e6466b94176aa53daa505fd09fe511639aec5cf18b835b60af0ead
SSDEEP 49152:rnXnuNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNd:b
MD5 SHA1 SHA512 SSDEEP

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oumbgzq.exe

Path C:\Windows\SysWOW64\iutbkroa\oumbgzq.exe
Size 10.6MB
SHA256 a14a942cf536f8489a8e04163c04616532b476fb4e03dc49939864cbf3cb11c8
MD5 945382fb2de0c57ded86acecfb583229
SHA1 6d6a1c7abd9bf0a3a89e50847f7a379994b49e03
SHA512 9547b7379db580cc76841703912c239896ad11c8b66148af9aa7a66031c391aae93c2493d7e6466b94176aa53daa505fd09fe511639aec5cf18b835b60af0ead
SSDEEP 49152:rnXnuNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNd:b
MD5 SHA1 SHA512 SSDEEP

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memory/32-152-0x0000000000400000-0x0000000000415000-memory.dmp

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memory/32-150-0x0000000000400000-0x0000000000415000-memory.dmp

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memory/32-145-0x0000000000400000-0x0000000000415000-memory.dmp

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memory/4084-147-0x0000000000638000-0x000000000064A000-memory.dmp

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memory/4084-149-0x0000000000400000-0x000000000055E000-memory.dmp

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memory/4084-151-0x0000000000400000-0x000000000055E000-memory.dmp

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memory/4752-143-0x0000000000400000-0x000000000055E000-memory.dmp

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memory/4752-132-0x000000000070D000-0x0000000000720000-memory.dmp

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memory/4752-134-0x0000000000400000-0x000000000055E000-memory.dmp

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memory/4752-133-0x0000000002290000-0x00000000022A3000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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