tofsee | 8299a18a6f137c931988ad6e1f68e99240c02fc765bdf37beb652b39d91fa822

General

Target

file.exe
Size

235KB
MD5

cebfc9645b080c19ca29154ed4fbe4ab
SHA1

2de92713f76bbfd4f455be2146c5e890ea41e6a0
SHA256

8299a18a6f137c931988ad6e1f68e99240c02fc765bdf37beb652b39d91fa822
SHA512

4836f50f24f3320370e54ab35ea695ef4f8e2008757192ae5b93581b28a108c40792bd515053f2af8f1446df59c8d6c30b1334426aea790b8854393875f2cd8e
SSDEEP

3072:bUPv9wTIHrDRHV5JCdezw0OU9c0WAwnxLYdNfD/e8h1lGtYEZllNHwh+LOb3TYtq:QHKIHZVnCD0PVU6bGHZf5sLbDYt+

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

jotunheim.name

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee

Windows security bypass 2 TTPs 1 IoCs

evasion trojan

Disabling Security Tools

T1089

Modify Registry

T1112

Processes:

svchost.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Windows\SysWOW64\oqfgwhll = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

New Service
T1050
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

1768 netsh.exe

pid	process
1768	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

svchost.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\oqfgwhll\ImagePath = "C:\\Windows\\SysWOW64\\oqfgwhll\\semjpcig.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

1328 svchost.exe
Executes dropped EXE 1 IoCs

Processes:

semjpcig.exe

pid process

1656 semjpcig.exe
Drops file in System32 directory 1 IoCs

Processes:

svchost.exe

description ioc process

File created C:\Windows\SysWOW64\config\systemprofile:.repos svchost.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

semjpcig.exe

description pid process target process

PID 1656 set thread context of 1328 1656 semjpcig.exe svchost.exe
Launches sc.exe 3 IoCs
Sc.exe is a Windows utlilty to control services on the system.

Processes:

sc.exesc.exesc.exe

pid process

560 sc.exe
468 sc.exe
1740 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
1328	svchost.exe

pid	process
1656	semjpcig.exe

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

description	pid	process	target process
PID 1656 set thread context of 1328	1656	semjpcig.exe	svchost.exe

pid	process
560	sc.exe
468	sc.exe
1740	sc.exe

Modifies data under HKEY_USERS 2 IoCs

Processes:

svchost.exe

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 30 IoCs

Processes:

file.exesemjpcig.exe

description	pid	process	target process
PID 1976 wrote to memory of 1944	1976	file.exe	cmd.exe
PID 1976 wrote to memory of 1944	1976	file.exe	cmd.exe
PID 1976 wrote to memory of 1944	1976	file.exe	cmd.exe
PID 1976 wrote to memory of 1944	1976	file.exe	cmd.exe
PID 1976 wrote to memory of 1688	1976	file.exe	cmd.exe
PID 1976 wrote to memory of 1688	1976	file.exe	cmd.exe
PID 1976 wrote to memory of 1688	1976	file.exe	cmd.exe
PID 1976 wrote to memory of 1688	1976	file.exe	cmd.exe
PID 1976 wrote to memory of 560	1976	file.exe	sc.exe
PID 1976 wrote to memory of 560	1976	file.exe	sc.exe
PID 1976 wrote to memory of 560	1976	file.exe	sc.exe
PID 1976 wrote to memory of 560	1976	file.exe	sc.exe
PID 1976 wrote to memory of 468	1976	file.exe	sc.exe
PID 1976 wrote to memory of 468	1976	file.exe	sc.exe
PID 1976 wrote to memory of 468	1976	file.exe	sc.exe
PID 1976 wrote to memory of 468	1976	file.exe	sc.exe
PID 1976 wrote to memory of 1740	1976	file.exe	sc.exe
PID 1976 wrote to memory of 1740	1976	file.exe	sc.exe
PID 1976 wrote to memory of 1740	1976	file.exe	sc.exe
PID 1976 wrote to memory of 1740	1976	file.exe	sc.exe
PID 1656 wrote to memory of 1328	1656	semjpcig.exe	svchost.exe
PID 1656 wrote to memory of 1328	1656	semjpcig.exe	svchost.exe
PID 1656 wrote to memory of 1328	1656	semjpcig.exe	svchost.exe
PID 1656 wrote to memory of 1328	1656	semjpcig.exe	svchost.exe
PID 1976 wrote to memory of 1768	1976	file.exe	netsh.exe
PID 1976 wrote to memory of 1768	1976	file.exe	netsh.exe
PID 1976 wrote to memory of 1768	1976	file.exe	netsh.exe
PID 1976 wrote to memory of 1768	1976	file.exe	netsh.exe
PID 1656 wrote to memory of 1328	1656	semjpcig.exe	svchost.exe
PID 1656 wrote to memory of 1328	1656	semjpcig.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1976
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\oqfgwhll\
  2⤵
  PID:1944
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\semjpcig.exe" C:\Windows\SysWOW64\oqfgwhll\
  2⤵
  PID:1688
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create oqfgwhll binPath= "C:\Windows\SysWOW64\oqfgwhll\semjpcig.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:560
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description oqfgwhll "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:468
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start oqfgwhll
  2⤵
  - Launches sc.exe
  PID:1740
- 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:1768

C:\Windows\SysWOW64\oqfgwhll\semjpcig.exe
C:\Windows\SysWOW64\oqfgwhll\semjpcig.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1656
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Windows security bypass
  - Sets service image path in registry
  - Deletes itself
  - Drops file in System32 directory
  - Modifies data under HKEY_USERS
  PID:1328

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

Disabling Security Tools

Modify Registry

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
13.5MB

MD5
04ae37d1dfae0c1464a638a137ad1063

SHA1
e79f75ceaf560d1ec4edede4aa8452fe5b4a8545

SHA256
a5cbca289855fcd62e03cbb762288c94426fd4718ec0c25e228670b89c2a3533

SHA512
1b9c8a8c27f655cc6f423602ca55b3b6e5bdb1a72eace76691968982ae59c0c54b71c558c9705b6048e01400a5325d665d4ae78932777fdefca62cd7181d7ce8

Download Submit
C:\Windows\SysWOW64\oqfgwhll\semjpcig.exe

Filesize
13.5MB

MD5
04ae37d1dfae0c1464a638a137ad1063

SHA1
e79f75ceaf560d1ec4edede4aa8452fe5b4a8545

SHA256
a5cbca289855fcd62e03cbb762288c94426fd4718ec0c25e228670b89c2a3533

SHA512
1b9c8a8c27f655cc6f423602ca55b3b6e5bdb1a72eace76691968982ae59c0c54b71c558c9705b6048e01400a5325d665d4ae78932777fdefca62cd7181d7ce8

Download Submit
memory/1328-61-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/1328-60-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1328-63-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1328-67-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1328-68-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1328-69-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1328-71-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1656-64-0x0000000000400000-0x00000000006BB000-memory.dmp

Filesize
2.7MB

Download
memory/1976-56-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/1976-62-0x0000000000400000-0x00000000006BB000-memory.dmp

Filesize
2.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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