tofsee | 72ddf1a00d4705c99c0d26668d6af55071dcddeb9c4da47f87e5c69dc1ef3e19

Analysis

max time kernel
149s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
02/12/2022, 10:10

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General

Target
file.exe
Size 350KB
Sample221202-l7ertaba8s
SHA256 72ddf1a00d4705c99c0d26668d6af55071dcddeb9c4da47f87e5c69dc1ef3e19
MD5 e6c5a231ec3235d5020f4af44ee5f2b8
SHA1 ae7aeaf37397c4adf15eb839f3a69b0b64444e9f
SHA512 367668d17178bb47ab49afdd7d9ff73682cca7872920e587592f739b55805f056b3f93613bff6d359f84f4c0d18c6bc9ac461d30998dce865130ebec50380692
SSDEEP 6144:KHXLG/6QDZw2FGxTKrzXR8+zqrWuRjMgU:K3S/DK2sYzXR8/RQg
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
1564	qtcnnjjg.exe

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Modify Existing Service

T1031

pid	Process
4628	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\kesfnmff\ImagePath = "C:\\Windows\\SysWOW64\\kesfnmff\\qtcnnjjg.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	file.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1564 set thread context of 220	1564	qtcnnjjg.exe	97

Launches sc.exe 3 IoCs

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

pid	Process
4332	sc.exe
4660	sc.exe
5044	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
3476	2400	WerFault.exe	81
3528	1564	WerFault.exe	95

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 2400 wrote to memory of 4488	2400	file.exe	82
PID 2400 wrote to memory of 4488	2400	file.exe	82
PID 2400 wrote to memory of 4488	2400	file.exe	82
PID 2400 wrote to memory of 4872	2400	file.exe	84
PID 2400 wrote to memory of 4872	2400	file.exe	84
PID 2400 wrote to memory of 4872	2400	file.exe	84
PID 2400 wrote to memory of 4332	2400	file.exe	86
PID 2400 wrote to memory of 4332	2400	file.exe	86
PID 2400 wrote to memory of 4332	2400	file.exe	86
PID 2400 wrote to memory of 4660	2400	file.exe	88
PID 2400 wrote to memory of 4660	2400	file.exe	88
PID 2400 wrote to memory of 4660	2400	file.exe	88
PID 2400 wrote to memory of 5044	2400	file.exe	90
PID 2400 wrote to memory of 5044	2400	file.exe	90
PID 2400 wrote to memory of 5044	2400	file.exe	90
PID 2400 wrote to memory of 4628	2400	file.exe	92
PID 2400 wrote to memory of 4628	2400	file.exe	92
PID 2400 wrote to memory of 4628	2400	file.exe	92
PID 1564 wrote to memory of 220	1564	qtcnnjjg.exe	97
PID 1564 wrote to memory of 220	1564	qtcnnjjg.exe	97
PID 1564 wrote to memory of 220	1564	qtcnnjjg.exe	97
PID 1564 wrote to memory of 220	1564	qtcnnjjg.exe	97
PID 1564 wrote to memory of 220	1564	qtcnnjjg.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:2400
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\kesfnmff\
  2⤵
  PID:4488
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\qtcnnjjg.exe" C:\Windows\SysWOW64\kesfnmff\
  2⤵
  PID:4872
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create kesfnmff binPath= "C:\Windows\SysWOW64\kesfnmff\qtcnnjjg.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:4332
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description kesfnmff "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:4660
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start kesfnmff
  2⤵
  - Launches sc.exe
  PID:5044
- 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:4628
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2400 -s 1248
  2⤵
  - Program crash
  PID:3476

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 2400 -ip 2400
1⤵
PID:4144

C:\Windows\SysWOW64\kesfnmff\qtcnnjjg.exe
C:\Windows\SysWOW64\kesfnmff\qtcnnjjg.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1564
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  PID:220
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1564 -s 552
  2⤵
  - Program crash
  PID:3528

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 492 -p 1564 -ip 1564
1⤵
PID:3552

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

qtcnnjjg.exe

Path C:\Users\Admin\AppData\Local\Temp\qtcnnjjg.exe
Size 12.0MB
SHA256 2f01d90ce373a99f6c185b5469821dc80e068fe0df39937e8e76f28f19f90352
MD5 f369527d57bc47898ae64113edb2d1d0
SHA1 8c10f7062cb63b2838d8e3069d21e83198dcb56c
SHA512 429b15b22ad090f5b2af4ed0c771e7203e38bff7063880ba266e438ff1c21dc6756830b58af044038c007de3d2546dbf860b17f28332fdb052f90c921b49e4e3
SSDEEP 6144:cHXLG/6QDZw2FGxTKrzXR8+zqrWuRjMgU:c3S/DK2sYzXR8/RQg
MD5 SHA1 SHA512 SSDEEP

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qtcnnjjg.exe

Path C:\Windows\SysWOW64\kesfnmff\qtcnnjjg.exe
Size 12.0MB
SHA256 2f01d90ce373a99f6c185b5469821dc80e068fe0df39937e8e76f28f19f90352
MD5 f369527d57bc47898ae64113edb2d1d0
SHA1 8c10f7062cb63b2838d8e3069d21e83198dcb56c
SHA512 429b15b22ad090f5b2af4ed0c771e7203e38bff7063880ba266e438ff1c21dc6756830b58af044038c007de3d2546dbf860b17f28332fdb052f90c921b49e4e3
SSDEEP 6144:cHXLG/6QDZw2FGxTKrzXR8+zqrWuRjMgU:c3S/DK2sYzXR8/RQg
MD5 SHA1 SHA512 SSDEEP

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memory/220-145-0x0000000001100000-0x0000000001115000-memory.dmp

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memory/220-150-0x0000000001100000-0x0000000001115000-memory.dmp

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memory/220-151-0x0000000001100000-0x0000000001115000-memory.dmp

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memory/1564-148-0x0000000000672000-0x0000000000687000-memory.dmp

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memory/1564-149-0x0000000000400000-0x000000000045D000-memory.dmp

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memory/2400-134-0x0000000000570000-0x0000000000583000-memory.dmp

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memory/2400-135-0x0000000000400000-0x000000000045D000-memory.dmp

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memory/2400-142-0x0000000000400000-0x000000000045D000-memory.dmp

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memory/2400-133-0x00000000007A7000-0x00000000007BC000-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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