tofsee | 302ca1dafea52c0039cbc171712eef95339daf45d441e669c18d629826343638

Analysis

max time kernel
144s
max time network
142s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
29/08/2022, 12:58

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General

Target
file.exe
Size 279KB
Sample220829-p7g4qahebl
SHA256 302ca1dafea52c0039cbc171712eef95339daf45d441e669c18d629826343638
MD5 cbfb38108965fc180773854a4e8adbff
SHA1 e3ca0a89c87395ce6f3e34add16effad74830a2d
SHA512 f584b64e4dea370e24b4a4112a61128f4e97a3a39837974cc570e8cb49666f7d482ce1de1afa8e8dd496a071526872b976f2227e46c04c16713708ba98dc8f79
SSDEEP 3072:PXhR6Jc57EO47qq9ZaUtquOHrzquoN0alnRWzd0:/+c57t4X9ZaFvfq50aNRWzd0
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

Executes dropped EXE 1 IoCs

pid	Process
3396	caywaewx.exe

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Modify Existing Service

T1031

pid	Process
680	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\xukkvxdp\ImagePath = "C:\\Windows\\SysWOW64\\xukkvxdp\\caywaewx.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

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 3396 set thread context of 4516	3396	caywaewx.exe	107

Launches sc.exe 3 IoCs

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

pid	Process
3912	sc.exe
1672	sc.exe
2428	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 1 IoCs

pid	pid_target	Process	procid_target
4456	1652	WerFault.exe	81

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 1652 wrote to memory of 4340	1652	file.exe	89
PID 1652 wrote to memory of 4340	1652	file.exe	89
PID 1652 wrote to memory of 4340	1652	file.exe	89
PID 1652 wrote to memory of 4596	1652	file.exe	91
PID 1652 wrote to memory of 4596	1652	file.exe	91
PID 1652 wrote to memory of 4596	1652	file.exe	91
PID 1652 wrote to memory of 3912	1652	file.exe	93
PID 1652 wrote to memory of 3912	1652	file.exe	93
PID 1652 wrote to memory of 3912	1652	file.exe	93
PID 1652 wrote to memory of 1672	1652	file.exe	95
PID 1652 wrote to memory of 1672	1652	file.exe	95
PID 1652 wrote to memory of 1672	1652	file.exe	95
PID 1652 wrote to memory of 2428	1652	file.exe	97
PID 1652 wrote to memory of 2428	1652	file.exe	97
PID 1652 wrote to memory of 2428	1652	file.exe	97
PID 1652 wrote to memory of 680	1652	file.exe	100
PID 1652 wrote to memory of 680	1652	file.exe	100
PID 1652 wrote to memory of 680	1652	file.exe	100
PID 3396 wrote to memory of 4516	3396	caywaewx.exe	107
PID 3396 wrote to memory of 4516	3396	caywaewx.exe	107
PID 3396 wrote to memory of 4516	3396	caywaewx.exe	107
PID 3396 wrote to memory of 4516	3396	caywaewx.exe	107
PID 3396 wrote to memory of 4516	3396	caywaewx.exe	107

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:1652
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\xukkvxdp\
  2⤵
  PID:4340
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\caywaewx.exe" C:\Windows\SysWOW64\xukkvxdp\
  2⤵
  PID:4596
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create xukkvxdp binPath= "C:\Windows\SysWOW64\xukkvxdp\caywaewx.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:3912
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description xukkvxdp "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:1672
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start xukkvxdp
  2⤵
  - Launches sc.exe
  PID:2428
- 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:680
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1652 -s 1224
  2⤵
  - Program crash
  PID:4456

C:\Windows\SysWOW64\xukkvxdp\caywaewx.exe
C:\Windows\SysWOW64\xukkvxdp\caywaewx.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3396
- 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:4516

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 1652 -ip 1652
1⤵
PID:3092

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

caywaewx.exe

Path C:\Users\Admin\AppData\Local\Temp\caywaewx.exe
Size 10.3MB
SHA256 b8f42392eae5ac37cb3e1fe2e3936907602934df82f362d1e55d46517c6ddf9e
MD5 acc36a8084e4b85da87247fb7d9b824f
SHA1 b6a7834b575dd8015667b9bd4e29d565a7e5287a
SHA512 1b74cfabf419121a2efb75c01a24b1570243979145ad099609576a67bc49d97ed0e962fe36c979f856b8bb025b41dc1a125180cef616e5a330a9f4339fbb2fec
SSDEEP 196608:jLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL:
MD5 SHA1 SHA512 SSDEEP

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caywaewx.exe

Path C:\Windows\SysWOW64\xukkvxdp\caywaewx.exe
Size 10.3MB
SHA256 b8f42392eae5ac37cb3e1fe2e3936907602934df82f362d1e55d46517c6ddf9e
MD5 acc36a8084e4b85da87247fb7d9b824f
SHA1 b6a7834b575dd8015667b9bd4e29d565a7e5287a
SHA512 1b74cfabf419121a2efb75c01a24b1570243979145ad099609576a67bc49d97ed0e962fe36c979f856b8bb025b41dc1a125180cef616e5a330a9f4339fbb2fec
SSDEEP 196608:jLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL:
MD5 SHA1 SHA512 SSDEEP

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memory/1652-132-0x0000000002DCD000-0x0000000002DDE000-memory.dmp

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memory/1652-133-0x0000000002D20000-0x0000000002D33000-memory.dmp

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memory/1652-134-0x0000000000400000-0x0000000002B8E000-memory.dmp

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memory/1652-145-0x0000000000400000-0x0000000002B8E000-memory.dmp

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memory/1652-136-0x0000000002DCD000-0x0000000002DDE000-memory.dmp

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memory/1652-137-0x0000000002D20000-0x0000000002D33000-memory.dmp

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memory/3396-150-0x0000000002F29000-0x0000000002F3A000-memory.dmp

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memory/3396-151-0x0000000000400000-0x0000000002B8E000-memory.dmp

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memory/4516-147-0x0000000000E40000-0x0000000000E55000-memory.dmp

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memory/4516-152-0x0000000000E40000-0x0000000000E55000-memory.dmp

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memory/4516-153-0x0000000000E40000-0x0000000000E55000-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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