tofsee | d4c8775b95b6d0f4c5384a6526afa7f00aeabb08aa6a1fe545e4193d60a2c205

General

Target

file.exe
Size

168KB
MD5

c8789056c4fa188b6f6d23e2da5e8655
SHA1

bffc6adeee841c0976e31d6518bab3f5e85bd589
SHA256

d4c8775b95b6d0f4c5384a6526afa7f00aeabb08aa6a1fe545e4193d60a2c205
SHA512

be89c3d2b76c2da856395a0d935206d9a1da034f501d8a029a8925903328cfad4e4d21ada9fe646e51fd046b197edf49f6666cc9b0d4fc2926009567cd20fba1
SSDEEP

3072:9omFCseno3BYS59iEemUxOCzpSu0Ih2Wzb:Rheo3BhezxpCIA

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

C2

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
3792	roijgoel.exe

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Modify Existing Service

T1031

pid	Process
4200	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\hjbeoojw\ImagePath = "C:\\Windows\\SysWOW64\\hjbeoojw\\roijgoel.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-1-5-21-2891029575-1462575-1165213807-1000\Control Panel\International\Geo\Nation	file.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3792 set thread context of 4740	3792	roijgoel.exe	102

Launches sc.exe 3 IoCs

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

pid	Process
2724	sc.exe
1572	sc.exe
224	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
1784	1632	WerFault.exe	77
1616	3792	WerFault.exe	97

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 1632 wrote to memory of 1924	1632	file.exe	80
PID 1632 wrote to memory of 1924	1632	file.exe	80
PID 1632 wrote to memory of 1924	1632	file.exe	80
PID 1632 wrote to memory of 2080	1632	file.exe	83
PID 1632 wrote to memory of 2080	1632	file.exe	83
PID 1632 wrote to memory of 2080	1632	file.exe	83
PID 1632 wrote to memory of 1572	1632	file.exe	85
PID 1632 wrote to memory of 1572	1632	file.exe	85
PID 1632 wrote to memory of 1572	1632	file.exe	85
PID 1632 wrote to memory of 224	1632	file.exe	87
PID 1632 wrote to memory of 224	1632	file.exe	87
PID 1632 wrote to memory of 224	1632	file.exe	87
PID 1632 wrote to memory of 2724	1632	file.exe	90
PID 1632 wrote to memory of 2724	1632	file.exe	90
PID 1632 wrote to memory of 2724	1632	file.exe	90
PID 1632 wrote to memory of 4200	1632	file.exe	92
PID 1632 wrote to memory of 4200	1632	file.exe	92
PID 1632 wrote to memory of 4200	1632	file.exe	92
PID 3792 wrote to memory of 4740	3792	roijgoel.exe	102
PID 3792 wrote to memory of 4740	3792	roijgoel.exe	102
PID 3792 wrote to memory of 4740	3792	roijgoel.exe	102
PID 3792 wrote to memory of 4740	3792	roijgoel.exe	102
PID 3792 wrote to memory of 4740	3792	roijgoel.exe	102

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:1632
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\hjbeoojw\
  2⤵
  PID:1924
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\roijgoel.exe" C:\Windows\SysWOW64\hjbeoojw\
  2⤵
  PID:2080
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create hjbeoojw binPath= "C:\Windows\SysWOW64\hjbeoojw\roijgoel.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:1572
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description hjbeoojw "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:224
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start hjbeoojw
  2⤵
  - Launches sc.exe
  PID:2724
- 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:4200
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1632 -s 1176
  2⤵
  - Program crash
  PID:1784

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 1632 -ip 1632
1⤵
PID:4364

C:\Windows\SysWOW64\hjbeoojw\roijgoel.exe
C:\Windows\SysWOW64\hjbeoojw\roijgoel.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3792
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  PID:4740
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 3792 -s 508
  2⤵
  - Program crash
  PID:1616

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 548 -p 3792 -ip 3792
1⤵
PID:2540

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Modify Existing Service

New Service

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

New Service

1

T1050

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\roijgoel.exe

Filesize
14.0MB

MD5
034bc5bb047563aeef03c8b3aa7e0552

SHA1
2a5637c04ebb470a2c7692cfdff69d1cc60b124c

SHA256
d55ae2717d4b502a8d202ad1e94dce0437c0d3d2d6b361667cabe03e86a0499e

SHA512
28892a5371c8e864960f713677d1facd8110387f2c18836733a89cc7724aa085adf0a7a7fcc68e4a9ba6f2f311389c316c4d989557017c27da0b4fdab09609f0

Download Submit
C:\Windows\SysWOW64\hjbeoojw\roijgoel.exe

Filesize
14.0MB

MD5
034bc5bb047563aeef03c8b3aa7e0552

SHA1
2a5637c04ebb470a2c7692cfdff69d1cc60b124c

SHA256
d55ae2717d4b502a8d202ad1e94dce0437c0d3d2d6b361667cabe03e86a0499e

SHA512
28892a5371c8e864960f713677d1facd8110387f2c18836733a89cc7724aa085adf0a7a7fcc68e4a9ba6f2f311389c316c4d989557017c27da0b4fdab09609f0

Download Submit
memory/1632-143-0x0000000000A3D000-0x0000000000A4E000-memory.dmp

Filesize
68KB

Download
memory/1632-144-0x00000000009A0000-0x00000000009B3000-memory.dmp

Filesize
76KB

Download
memory/1632-132-0x0000000000A3D000-0x0000000000A4E000-memory.dmp

Filesize
68KB

Download
memory/1632-133-0x00000000009A0000-0x00000000009B3000-memory.dmp

Filesize
76KB

Download
memory/1632-134-0x0000000000400000-0x000000000070B000-memory.dmp

Filesize
3.0MB

Download
memory/1632-145-0x0000000000400000-0x000000000070B000-memory.dmp

Filesize
3.0MB

Download
memory/3792-150-0x0000000000AD8000-0x0000000000AE9000-memory.dmp

Filesize
68KB

Download
memory/3792-151-0x0000000000400000-0x000000000070B000-memory.dmp

Filesize
3.0MB

Download
memory/4740-147-0x0000000001010000-0x0000000001025000-memory.dmp

Filesize
84KB

Download
memory/4740-152-0x0000000001010000-0x0000000001025000-memory.dmp

Filesize
84KB

Download
memory/4740-153-0x0000000001010000-0x0000000001025000-memory.dmp

Filesize
84KB

Download

Analysis

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