tofsee | f16238cbe16b93a141e4e8f026b9ce3ca393f63d78c1b7b6ff2e0ed19f240f5e

Analysis

max time kernel
149s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
22/08/2022, 10:13

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General

Target
f557af1a5cdb18ade1bdfe8de2f013e4.exe
Size 307KB
Sample220822-l83v2ahcf9
SHA256 f16238cbe16b93a141e4e8f026b9ce3ca393f63d78c1b7b6ff2e0ed19f240f5e
MD5 f557af1a5cdb18ade1bdfe8de2f013e4
SHA1 012f45b94ef9e094dcd7aa9f0652a94636d60d6b
SHA512 0777cf3d77198e87c3773a8981f496b8fe7051c7e98925a179b408542b92f35da18898728c7cbc00c2b163e7f8522f93a5a9ebdda2f75f968cfa50fdee341490
MD5 SHA1 SHA512

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
4512	vdarxbcn.exe

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Modify Existing Service

T1031

pid	Process
628	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\gykgitbz\ImagePath = "C:\\Windows\\SysWOW64\\gykgitbz\\vdarxbcn.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-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	f557af1a5cdb18ade1bdfe8de2f013e4.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 4512 set thread context of 1192	4512	vdarxbcn.exe	105

Launches sc.exe 3 IoCs

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

pid	Process
4448	sc.exe
4068	sc.exe
852	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
4012	4880	WerFault.exe	83
3768	4512	WerFault.exe	99

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 4880 wrote to memory of 3692	4880	f557af1a5cdb18ade1bdfe8de2f013e4.exe	88
PID 4880 wrote to memory of 3692	4880	f557af1a5cdb18ade1bdfe8de2f013e4.exe	88
PID 4880 wrote to memory of 3692	4880	f557af1a5cdb18ade1bdfe8de2f013e4.exe	88
PID 4880 wrote to memory of 3336	4880	f557af1a5cdb18ade1bdfe8de2f013e4.exe	90
PID 4880 wrote to memory of 3336	4880	f557af1a5cdb18ade1bdfe8de2f013e4.exe	90
PID 4880 wrote to memory of 3336	4880	f557af1a5cdb18ade1bdfe8de2f013e4.exe	90
PID 4880 wrote to memory of 4068	4880	f557af1a5cdb18ade1bdfe8de2f013e4.exe	92
PID 4880 wrote to memory of 4068	4880	f557af1a5cdb18ade1bdfe8de2f013e4.exe	92
PID 4880 wrote to memory of 4068	4880	f557af1a5cdb18ade1bdfe8de2f013e4.exe	92
PID 4880 wrote to memory of 852	4880	f557af1a5cdb18ade1bdfe8de2f013e4.exe	94
PID 4880 wrote to memory of 852	4880	f557af1a5cdb18ade1bdfe8de2f013e4.exe	94
PID 4880 wrote to memory of 852	4880	f557af1a5cdb18ade1bdfe8de2f013e4.exe	94
PID 4880 wrote to memory of 4448	4880	f557af1a5cdb18ade1bdfe8de2f013e4.exe	96
PID 4880 wrote to memory of 4448	4880	f557af1a5cdb18ade1bdfe8de2f013e4.exe	96
PID 4880 wrote to memory of 4448	4880	f557af1a5cdb18ade1bdfe8de2f013e4.exe	96
PID 4880 wrote to memory of 628	4880	f557af1a5cdb18ade1bdfe8de2f013e4.exe	100
PID 4880 wrote to memory of 628	4880	f557af1a5cdb18ade1bdfe8de2f013e4.exe	100
PID 4880 wrote to memory of 628	4880	f557af1a5cdb18ade1bdfe8de2f013e4.exe	100
PID 4512 wrote to memory of 1192	4512	vdarxbcn.exe	105
PID 4512 wrote to memory of 1192	4512	vdarxbcn.exe	105
PID 4512 wrote to memory of 1192	4512	vdarxbcn.exe	105
PID 4512 wrote to memory of 1192	4512	vdarxbcn.exe	105
PID 4512 wrote to memory of 1192	4512	vdarxbcn.exe	105

C:\Users\Admin\AppData\Local\Temp\f557af1a5cdb18ade1bdfe8de2f013e4.exe
"C:\Users\Admin\AppData\Local\Temp\f557af1a5cdb18ade1bdfe8de2f013e4.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4880
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\gykgitbz\
  2⤵
  PID:3692
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\vdarxbcn.exe" C:\Windows\SysWOW64\gykgitbz\
  2⤵
  PID:3336
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create gykgitbz binPath= "C:\Windows\SysWOW64\gykgitbz\vdarxbcn.exe /d\"C:\Users\Admin\AppData\Local\Temp\f557af1a5cdb18ade1bdfe8de2f013e4.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:4068
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description gykgitbz "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:852
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start gykgitbz
  2⤵
  - Launches sc.exe
  PID:4448
- 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:628
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4880 -s 1036
  2⤵
  - Program crash
  PID:4012

C:\Windows\SysWOW64\gykgitbz\vdarxbcn.exe
C:\Windows\SysWOW64\gykgitbz\vdarxbcn.exe /d"C:\Users\Admin\AppData\Local\Temp\f557af1a5cdb18ade1bdfe8de2f013e4.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4512
- 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:1192
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4512 -s 512
  2⤵
  - Program crash
  PID:3768

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 4880 -ip 4880
1⤵
PID:740

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 4512 -ip 4512
1⤵
PID:2624

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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vdarxbcn.exe

Path C:\Users\Admin\AppData\Local\Temp\vdarxbcn.exe
Size 10.0MB
SHA256 22b0d51efe75a5f747f15904266a9047da2bc0f6c64d3746d75b279519af6f4d
MD5 af03de1a180ce28e67cb26236258f2ed
SHA1 695038c129ff00d6a1918fc732a0171411b9699b
SHA512 9da7eff4a758eebbb0b8bf07b7664ef794e15b9d6ab845b229d9a5939ef9c6b036d82a7b8370bdbd4cc370901250662da758a73a78f356340d3deb2c9ad12f51
SSDEEP 6144:gIW4bJjVzzxDDIA0QKm8T5BSqqROmiJK0dI7xAMIRRRRRRRRRRRRRRRRRRRRRRR9:gt4bzzxDcA0QKj2q1mKDdI
MD5 SHA1 SHA512 SSDEEP

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vdarxbcn.exe

Path C:\Windows\SysWOW64\gykgitbz\vdarxbcn.exe
Size 10.0MB
SHA256 22b0d51efe75a5f747f15904266a9047da2bc0f6c64d3746d75b279519af6f4d
MD5 af03de1a180ce28e67cb26236258f2ed
SHA1 695038c129ff00d6a1918fc732a0171411b9699b
SHA512 9da7eff4a758eebbb0b8bf07b7664ef794e15b9d6ab845b229d9a5939ef9c6b036d82a7b8370bdbd4cc370901250662da758a73a78f356340d3deb2c9ad12f51
SSDEEP 6144:gIW4bJjVzzxDDIA0QKm8T5BSqqROmiJK0dI7xAMIRRRRRRRRRRRRRRRRRRRRRRR9:gt4bzzxDcA0QKj2q1mKDdI
MD5 SHA1 SHA512 SSDEEP

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memory/1192-151-0x0000000000500000-0x0000000000515000-memory.dmp

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memory/1192-150-0x0000000000500000-0x0000000000515000-memory.dmp

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memory/1192-145-0x0000000000500000-0x0000000000515000-memory.dmp

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memory/4512-148-0x0000000000883000-0x0000000000893000-memory.dmp

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memory/4512-149-0x0000000000400000-0x0000000000850000-memory.dmp

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memory/4880-143-0x0000000000400000-0x0000000000850000-memory.dmp

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memory/4880-135-0x0000000000400000-0x0000000000850000-memory.dmp

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memory/4880-134-0x0000000000AE0000-0x0000000000AF3000-memory.dmp

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memory/4880-133-0x0000000000BB8000-0x0000000000BC9000-memory.dmp

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Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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