tofsee | c841cb96a9a0648f1d9df6b16c244bc1e80aca79eebd77e733c2c33ddcef5e1a

Analysis

max time kernel
151s
max time network
158s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
26/11/2022, 04:28

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General

Target
file.exe
Size 147KB
Sample221126-e3netsfc3s
SHA256 c841cb96a9a0648f1d9df6b16c244bc1e80aca79eebd77e733c2c33ddcef5e1a
MD5 1eb05ec5bc5982ebc88aa1ad6b69fb46
SHA1 fcfc2f0c0f5cc446961959165b6dc01b29b23701
SHA512 c591a73be6073da3ee9a2f80336ba386c31c9f5f08332d5b8a6ec959bb8a6cc929dae51309832c648af44c69e712082f930e11ae3324a528bcfe5ff1265bb9f6
SSDEEP 3072:fkJxzH6d2wC065TLWslukoo1Cl7U8onB:f4i2wklukooS7U8
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
224	ztjadben.exe

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Modify Existing Service

T1031

pid	Process
4016	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\hdeaudju\ImagePath = "C:\\Windows\\SysWOW64\\hdeaudju\\ztjadben.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

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 224 set thread context of 3528	224	ztjadben.exe	97

Launches sc.exe 3 IoCs

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

pid	Process
4232	sc.exe
2524	sc.exe
2920	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
3212	1752	WerFault.exe	78
4492	224	WerFault.exe	89

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 1752 wrote to memory of 4644	1752	file.exe	79
PID 1752 wrote to memory of 4644	1752	file.exe	79
PID 1752 wrote to memory of 4644	1752	file.exe	79
PID 1752 wrote to memory of 2456	1752	file.exe	81
PID 1752 wrote to memory of 2456	1752	file.exe	81
PID 1752 wrote to memory of 2456	1752	file.exe	81
PID 1752 wrote to memory of 4232	1752	file.exe	83
PID 1752 wrote to memory of 4232	1752	file.exe	83
PID 1752 wrote to memory of 4232	1752	file.exe	83
PID 1752 wrote to memory of 2524	1752	file.exe	85
PID 1752 wrote to memory of 2524	1752	file.exe	85
PID 1752 wrote to memory of 2524	1752	file.exe	85
PID 1752 wrote to memory of 2920	1752	file.exe	87
PID 1752 wrote to memory of 2920	1752	file.exe	87
PID 1752 wrote to memory of 2920	1752	file.exe	87
PID 1752 wrote to memory of 4016	1752	file.exe	90
PID 1752 wrote to memory of 4016	1752	file.exe	90
PID 1752 wrote to memory of 4016	1752	file.exe	90
PID 224 wrote to memory of 3528	224	ztjadben.exe	97
PID 224 wrote to memory of 3528	224	ztjadben.exe	97
PID 224 wrote to memory of 3528	224	ztjadben.exe	97
PID 224 wrote to memory of 3528	224	ztjadben.exe	97
PID 224 wrote to memory of 3528	224	ztjadben.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:1752
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\hdeaudju\
  2⤵
  PID:4644
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ztjadben.exe" C:\Windows\SysWOW64\hdeaudju\
  2⤵
  PID:2456
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create hdeaudju binPath= "C:\Windows\SysWOW64\hdeaudju\ztjadben.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:4232
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description hdeaudju "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:2524
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start hdeaudju
  2⤵
  - Launches sc.exe
  PID:2920
- 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:4016
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1752 -s 648
  2⤵
  - Program crash
  PID:3212

C:\Windows\SysWOW64\hdeaudju\ztjadben.exe
C:\Windows\SysWOW64\hdeaudju\ztjadben.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:224
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  PID:3528
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 224 -s 516
  2⤵
  - Program crash
  PID:4492

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 1752 -ip 1752
1⤵
PID:1992

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 224 -ip 224
1⤵
PID:2532

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

ztjadben.exe

Path C:\Users\Admin\AppData\Local\Temp\ztjadben.exe
Size 14.4MB
SHA256 5504c3d153bf5e3fdfa6626e6a966961d83ddfc8fa6a624be0f031dafc4081ae
MD5 fcfe10c254fe5b17b2b0f490121d2894
SHA1 a771604400e87a4e6df52e3404fd09594390aaa2
SHA512 4dfd6f34718ad5246626358f609d3b48296f3d70c307172c77325bc07e8ad65d9ad5858651447d25fc187fd08f43dd397bc48794f62a323cc0d6ba40803812ee
SSDEEP 6144:v4i2wklukooS7U8UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUY:v4s6utv
MD5 SHA1 SHA512 SSDEEP

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ztjadben.exe

Path C:\Windows\SysWOW64\hdeaudju\ztjadben.exe
Size 14.4MB
SHA256 5504c3d153bf5e3fdfa6626e6a966961d83ddfc8fa6a624be0f031dafc4081ae
MD5 fcfe10c254fe5b17b2b0f490121d2894
SHA1 a771604400e87a4e6df52e3404fd09594390aaa2
SHA512 4dfd6f34718ad5246626358f609d3b48296f3d70c307172c77325bc07e8ad65d9ad5858651447d25fc187fd08f43dd397bc48794f62a323cc0d6ba40803812ee
SSDEEP 6144:v4i2wklukooS7U8UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUY:v4s6utv
MD5 SHA1 SHA512 SSDEEP

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memory/224-152-0x0000000000400000-0x0000000000AD6000-memory.dmp

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memory/224-146-0x0000000000400000-0x0000000000AD6000-memory.dmp

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memory/224-151-0x0000000000C39000-0x0000000000C49000-memory.dmp

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memory/224-145-0x0000000000C39000-0x0000000000C49000-memory.dmp

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memory/1752-134-0x0000000000400000-0x0000000000AD6000-memory.dmp

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memory/1752-133-0x0000000002810000-0x0000000002823000-memory.dmp

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memory/1752-132-0x0000000000B3D000-0x0000000000B4D000-memory.dmp

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memory/1752-143-0x0000000002810000-0x0000000002823000-memory.dmp

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memory/1752-144-0x0000000000400000-0x0000000000AD6000-memory.dmp

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memory/3528-148-0x00000000006D0000-0x00000000006E5000-memory.dmp

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memory/3528-153-0x00000000006D0000-0x00000000006E5000-memory.dmp

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memory/3528-154-0x00000000006D0000-0x00000000006E5000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads