tofsee | dae33d38f40bc387c3decf2d8388795f5aaae213062181806c8a6a94d4e31409

Analysis

max time kernel
152s
max time network
153s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
10/02/2023, 11:30

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General

Target
file.exe
Size 357KB
Sample230210-nl6draea85
SHA256 dae33d38f40bc387c3decf2d8388795f5aaae213062181806c8a6a94d4e31409
MD5 f35b1bf55afb2ec8d9e13a8f15e21d89
SHA1 5aa7bf6e603321edb6e6fd244fabc6e9b195de0b
SHA512 761768e1ca5895ad8b25e7050e857f254b32b31bbb163e10f91dba5a0b6ae6819d47ab970947f348b8f62953cb5925102d46145ae95a595db7f92fa99174d0ff
SSDEEP 3072:ZwCbieK9GBaH91u4+R6hNOruBFYI4TzCVA8KmuyTlfdU2cZpx9nf6NAI2UUU/:aKG8adVhr/Y+VA8K65JcZVnfWfT/
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
2032	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\zqoekyau\ImagePath = "C:\\Windows\\SysWOW64\\zqoekyau\\brtgxpa.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
4260	brtgxpa.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4260 set thread context of 4348	4260	brtgxpa.exe	97

Launches sc.exe 3 IoCs

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

pid	Process
4668	sc.exe
1676	sc.exe
3372	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
716	4840	WerFault.exe	79
1480	4260	WerFault.exe	94

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 4840 wrote to memory of 4568	4840	file.exe	80
PID 4840 wrote to memory of 4568	4840	file.exe	80
PID 4840 wrote to memory of 4568	4840	file.exe	80
PID 4840 wrote to memory of 872	4840	file.exe	82
PID 4840 wrote to memory of 872	4840	file.exe	82
PID 4840 wrote to memory of 872	4840	file.exe	82
PID 4840 wrote to memory of 4668	4840	file.exe	84
PID 4840 wrote to memory of 4668	4840	file.exe	84
PID 4840 wrote to memory of 4668	4840	file.exe	84
PID 4840 wrote to memory of 1676	4840	file.exe	86
PID 4840 wrote to memory of 1676	4840	file.exe	86
PID 4840 wrote to memory of 1676	4840	file.exe	86
PID 4840 wrote to memory of 3372	4840	file.exe	88
PID 4840 wrote to memory of 3372	4840	file.exe	88
PID 4840 wrote to memory of 3372	4840	file.exe	88
PID 4840 wrote to memory of 2032	4840	file.exe	90
PID 4840 wrote to memory of 2032	4840	file.exe	90
PID 4840 wrote to memory of 2032	4840	file.exe	90
PID 4260 wrote to memory of 4348	4260	brtgxpa.exe	97
PID 4260 wrote to memory of 4348	4260	brtgxpa.exe	97
PID 4260 wrote to memory of 4348	4260	brtgxpa.exe	97
PID 4260 wrote to memory of 4348	4260	brtgxpa.exe	97
PID 4260 wrote to memory of 4348	4260	brtgxpa.exe	97

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:4840
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\zqoekyau\
  2⤵
  PID:4568
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\brtgxpa.exe" C:\Windows\SysWOW64\zqoekyau\
  2⤵
  PID:872
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create zqoekyau binPath= "C:\Windows\SysWOW64\zqoekyau\brtgxpa.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:4668
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description zqoekyau "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:1676
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start zqoekyau
  2⤵
  - Launches sc.exe
  PID:3372
- 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:2032
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4840 -s 1040
  2⤵
  - Program crash
  PID:716

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 4840 -ip 4840
1⤵
PID:1936

C:\Windows\SysWOW64\zqoekyau\brtgxpa.exe
C:\Windows\SysWOW64\zqoekyau\brtgxpa.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4260
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  PID:4348
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4260 -s 528
  2⤵
  - Program crash
  PID:1480

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 536 -p 4260 -ip 4260
1⤵
PID:2316

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

brtgxpa.exe

Path C:\Users\Admin\AppData\Local\Temp\brtgxpa.exe
Size 11.4MB
SHA256 0baec960c6c06ee999cc95120f761fe3ea9c532d66d930a749c681775b25253d
MD5 d49d0eeeefbb676fdcbdbc18cc91e2fa
SHA1 dbd8b30889167ab489a02e56ae2b2ee5de199920
SHA512 cf775e6e6f6d1768a810612266df2e4284334a02e053ada8d9244f2d314cd508d0ce6fcb9b864849137b87c45a0f8b1368468351151717abbf8d3194def60169
SSDEEP 49152:+mKwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwg:h
MD5 SHA1 SHA512 SSDEEP

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brtgxpa.exe

Path C:\Windows\SysWOW64\zqoekyau\brtgxpa.exe
Size 11.4MB
SHA256 0baec960c6c06ee999cc95120f761fe3ea9c532d66d930a749c681775b25253d
MD5 d49d0eeeefbb676fdcbdbc18cc91e2fa
SHA1 dbd8b30889167ab489a02e56ae2b2ee5de199920
SHA512 cf775e6e6f6d1768a810612266df2e4284334a02e053ada8d9244f2d314cd508d0ce6fcb9b864849137b87c45a0f8b1368468351151717abbf8d3194def60169
SSDEEP 49152:+mKwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwg:h
MD5 SHA1 SHA512 SSDEEP

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memory/4260-152-0x0000000000400000-0x0000000000485000-memory.dmp

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memory/4348-149-0x00000000004C0000-0x00000000004D5000-memory.dmp

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memory/4348-153-0x00000000004C0000-0x00000000004D5000-memory.dmp

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memory/4348-154-0x00000000004C0000-0x00000000004D5000-memory.dmp

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memory/4840-141-0x000000000061D000-0x0000000000633000-memory.dmp

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memory/4840-142-0x0000000000400000-0x0000000000485000-memory.dmp

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memory/4840-134-0x0000000000400000-0x0000000000485000-memory.dmp

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memory/4840-146-0x000000000061D000-0x0000000000633000-memory.dmp

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memory/4840-147-0x0000000000400000-0x0000000000485000-memory.dmp

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memory/4840-132-0x000000000061D000-0x0000000000633000-memory.dmp

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memory/4840-133-0x00000000005E0000-0x00000000005F3000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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