tofsee | c841cb96a9a0648f1d9df6b16c244bc1e80aca79eebd77e733c2c33ddcef5e1a

General

Target

file.exe
Size

147KB
MD5

1eb05ec5bc5982ebc88aa1ad6b69fb46
SHA1

fcfc2f0c0f5cc446961959165b6dc01b29b23701
SHA256

c841cb96a9a0648f1d9df6b16c244bc1e80aca79eebd77e733c2c33ddcef5e1a
SHA512

c591a73be6073da3ee9a2f80336ba386c31c9f5f08332d5b8a6ec959bb8a6cc929dae51309832c648af44c69e712082f930e11ae3324a528bcfe5ff1265bb9f6
SSDEEP

3072:fkJxzH6d2wC065TLWslukoo1Cl7U8onB:f4i2wklukooS7U8

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

C2

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

Processes:

ztjadben.exe

pid process

224 ztjadben.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

4016 netsh.exe

pid	process
224	ztjadben.exe

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

Processes:

svchost.exe

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

Processes:

file.exe

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

Processes:

ztjadben.exe

description pid process target process

PID 224 set thread context of 3528 224 ztjadben.exe svchost.exe
Launches sc.exe 3 IoCs
Sc.exe is a Windows utlilty to control services on the system.

Processes:

sc.exesc.exesc.exe

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

Processes:

WerFault.exeWerFault.exe

pid pid_target process target process

3212 1752 WerFault.exe file.exe
4492 224 WerFault.exe ztjadben.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Control Panel\International\Geo\Nation	file.exe

description	pid	process	target process
PID 224 set thread context of 3528	224	ztjadben.exe	svchost.exe

pid	process
4232	sc.exe
2524	sc.exe
2920	sc.exe

pid	pid_target	process	target process
3212	1752	WerFault.exe	file.exe
4492	224	WerFault.exe	ztjadben.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

file.exeztjadben.exe

description	pid	process	target process
PID 1752 wrote to memory of 4644	1752	file.exe	cmd.exe
PID 1752 wrote to memory of 4644	1752	file.exe	cmd.exe
PID 1752 wrote to memory of 4644	1752	file.exe	cmd.exe
PID 1752 wrote to memory of 2456	1752	file.exe	cmd.exe
PID 1752 wrote to memory of 2456	1752	file.exe	cmd.exe
PID 1752 wrote to memory of 2456	1752	file.exe	cmd.exe
PID 1752 wrote to memory of 4232	1752	file.exe	sc.exe
PID 1752 wrote to memory of 4232	1752	file.exe	sc.exe
PID 1752 wrote to memory of 4232	1752	file.exe	sc.exe
PID 1752 wrote to memory of 2524	1752	file.exe	sc.exe
PID 1752 wrote to memory of 2524	1752	file.exe	sc.exe
PID 1752 wrote to memory of 2524	1752	file.exe	sc.exe
PID 1752 wrote to memory of 2920	1752	file.exe	sc.exe
PID 1752 wrote to memory of 2920	1752	file.exe	sc.exe
PID 1752 wrote to memory of 2920	1752	file.exe	sc.exe
PID 1752 wrote to memory of 4016	1752	file.exe	netsh.exe
PID 1752 wrote to memory of 4016	1752	file.exe	netsh.exe
PID 1752 wrote to memory of 4016	1752	file.exe	netsh.exe
PID 224 wrote to memory of 3528	224	ztjadben.exe	svchost.exe
PID 224 wrote to memory of 3528	224	ztjadben.exe	svchost.exe
PID 224 wrote to memory of 3528	224	ztjadben.exe	svchost.exe
PID 224 wrote to memory of 3528	224	ztjadben.exe	svchost.exe
PID 224 wrote to memory of 3528	224	ztjadben.exe	svchost.exe

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 Matrix ATT&CK v6

Initial Access

Execution

Persistence

New Service

1

T1050

Modify Existing Service

1

T1031

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

New Service

1

T1050

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\ztjadben.exe
Filesize
14.4MB

MD5
fcfe10c254fe5b17b2b0f490121d2894

SHA1
a771604400e87a4e6df52e3404fd09594390aaa2

SHA256
5504c3d153bf5e3fdfa6626e6a966961d83ddfc8fa6a624be0f031dafc4081ae

SHA512
4dfd6f34718ad5246626358f609d3b48296f3d70c307172c77325bc07e8ad65d9ad5858651447d25fc187fd08f43dd397bc48794f62a323cc0d6ba40803812ee

Download Submit
C:\Windows\SysWOW64\hdeaudju\ztjadben.exe
Filesize
14.4MB

MD5
fcfe10c254fe5b17b2b0f490121d2894

SHA1
a771604400e87a4e6df52e3404fd09594390aaa2

SHA256
5504c3d153bf5e3fdfa6626e6a966961d83ddfc8fa6a624be0f031dafc4081ae

SHA512
4dfd6f34718ad5246626358f609d3b48296f3d70c307172c77325bc07e8ad65d9ad5858651447d25fc187fd08f43dd397bc48794f62a323cc0d6ba40803812ee

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

Filesize
6.8MB

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

Filesize
6.8MB

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

Filesize
64KB

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

Filesize
64KB

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

Filesize
6.8MB

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

Filesize
76KB

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

Filesize
64KB

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

Filesize
76KB

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

Filesize
6.8MB

Download
memory/2456-136-0x0000000000000000-mapping.dmp

Download
memory/2524-139-0x0000000000000000-mapping.dmp

Download
memory/2920-140-0x0000000000000000-mapping.dmp

Download
memory/3528-147-0x0000000000000000-mapping.dmp

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

Filesize
84KB

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

Filesize
84KB

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

Filesize
84KB

Download
memory/4016-142-0x0000000000000000-mapping.dmp

Download
memory/4232-138-0x0000000000000000-mapping.dmp

Download
memory/4644-135-0x0000000000000000-mapping.dmp

Download

Analysis

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