tofsee | 12c8a5d0074b51c3d799ef722a7d97e7e1490529064759ef5932e0e76f28bf7e

General

Target

file.exe
Size

350KB
MD5

38e3f0f985ad66154c83f39a43c7b499
SHA1

c2082df23b60440e5e5661feab6001183c79c299
SHA256

12c8a5d0074b51c3d799ef722a7d97e7e1490529064759ef5932e0e76f28bf7e
SHA512

c955c141ca47679985da8cce632d0bcc6572956d5a19918061afc64067acda98f180385837c302e0e76e0386a06db085175131ee52569a3fb324becf795a19ce
SSDEEP

6144:G3gLadmInlyjX3m3iCww4ek4NYpIlIwassuYQuRjMgU:Gw2dHcjX3m3iC9SEYpIlHaBpdRQg

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:

twfqqmmj.exe

pid process

2300 twfqqmmj.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

4656 netsh.exe

pid	process
2300	twfqqmmj.exe

pid	process
4656	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\pkdkkhpn\ImagePath = "C:\\Windows\\SysWOW64\\pkdkkhpn\\twfqqmmj.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-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation file.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

twfqqmmj.exe

description pid process target process

PID 2300 set thread context of 1772 2300 twfqqmmj.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

1592 sc.exe
4620 sc.exe
2132 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

892 1660 WerFault.exe file.exe
3108 2300 WerFault.exe twfqqmmj.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	file.exe

description	pid	process	target process
PID 2300 set thread context of 1772	2300	twfqqmmj.exe	svchost.exe

pid	process
1592	sc.exe
4620	sc.exe
2132	sc.exe

pid	pid_target	process	target process
892	1660	WerFault.exe	file.exe
3108	2300	WerFault.exe	twfqqmmj.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

file.exetwfqqmmj.exe

description	pid	process	target process
PID 1660 wrote to memory of 4080	1660	file.exe	cmd.exe
PID 1660 wrote to memory of 4080	1660	file.exe	cmd.exe
PID 1660 wrote to memory of 4080	1660	file.exe	cmd.exe
PID 1660 wrote to memory of 4172	1660	file.exe	cmd.exe
PID 1660 wrote to memory of 4172	1660	file.exe	cmd.exe
PID 1660 wrote to memory of 4172	1660	file.exe	cmd.exe
PID 1660 wrote to memory of 1592	1660	file.exe	sc.exe
PID 1660 wrote to memory of 1592	1660	file.exe	sc.exe
PID 1660 wrote to memory of 1592	1660	file.exe	sc.exe
PID 1660 wrote to memory of 4620	1660	file.exe	sc.exe
PID 1660 wrote to memory of 4620	1660	file.exe	sc.exe
PID 1660 wrote to memory of 4620	1660	file.exe	sc.exe
PID 1660 wrote to memory of 2132	1660	file.exe	sc.exe
PID 1660 wrote to memory of 2132	1660	file.exe	sc.exe
PID 1660 wrote to memory of 2132	1660	file.exe	sc.exe
PID 1660 wrote to memory of 4656	1660	file.exe	netsh.exe
PID 1660 wrote to memory of 4656	1660	file.exe	netsh.exe
PID 1660 wrote to memory of 4656	1660	file.exe	netsh.exe
PID 2300 wrote to memory of 1772	2300	twfqqmmj.exe	svchost.exe
PID 2300 wrote to memory of 1772	2300	twfqqmmj.exe	svchost.exe
PID 2300 wrote to memory of 1772	2300	twfqqmmj.exe	svchost.exe
PID 2300 wrote to memory of 1772	2300	twfqqmmj.exe	svchost.exe
PID 2300 wrote to memory of 1772	2300	twfqqmmj.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:1660

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\pkdkkhpn\
2⤵
PID:4080

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\twfqqmmj.exe" C:\Windows\SysWOW64\pkdkkhpn\
2⤵
PID:4172

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create pkdkkhpn binPath= "C:\Windows\SysWOW64\pkdkkhpn\twfqqmmj.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:1592

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description pkdkkhpn "wifi internet conection"
2⤵
- Launches sc.exe
PID:4620

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start pkdkkhpn
2⤵
- Launches sc.exe
PID:2132

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:4656

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1660 -s 888
2⤵
- Program crash
PID:892

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 188 -p 1660 -ip 1660
1⤵
PID:4988

C:\Windows\SysWOW64\pkdkkhpn\twfqqmmj.exe
C:\Windows\SysWOW64\pkdkkhpn\twfqqmmj.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2300

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
PID:1772

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 2300 -s 232
2⤵
- Program crash
PID:3108

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 2300 -ip 2300
1⤵
PID:4220

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\twfqqmmj.exe
Filesize
14.4MB

MD5
cfe0d32714d1d9624ca2734455623b65

SHA1
85be4fe66ca00841e012326e099d576c5e5ad935

SHA256
9c7c21a542f2e6354e9fed5ef04dd94e4fb67440f60d3077af61764843dda113

SHA512
9269bbee9a2b99cbf2eec9edd6b95a8d7dd191dbd5888ac630f26ac1c462ed221c409faa7d2c0b105863b2c9024d68659129b5f57e94916d2ee2ea1c8eb88781

Download Submit
C:\Windows\SysWOW64\pkdkkhpn\twfqqmmj.exe
Filesize
14.4MB

MD5
cfe0d32714d1d9624ca2734455623b65

SHA1
85be4fe66ca00841e012326e099d576c5e5ad935

SHA256
9c7c21a542f2e6354e9fed5ef04dd94e4fb67440f60d3077af61764843dda113

SHA512
9269bbee9a2b99cbf2eec9edd6b95a8d7dd191dbd5888ac630f26ac1c462ed221c409faa7d2c0b105863b2c9024d68659129b5f57e94916d2ee2ea1c8eb88781

Download Submit
memory/1592-138-0x0000000000000000-mapping.dmp

Download
memory/1660-143-0x00000000005F7000-0x000000000060C000-memory.dmp

Filesize
84KB

Download
memory/1660-133-0x0000000000580000-0x0000000000593000-memory.dmp

Filesize
76KB

Download
memory/1660-134-0x0000000000400000-0x000000000045D000-memory.dmp

Filesize
372KB

Download
memory/1660-132-0x00000000005F7000-0x000000000060C000-memory.dmp

Filesize
84KB

Download
memory/1660-144-0x0000000000400000-0x000000000045D000-memory.dmp

Filesize
372KB

Download
memory/1772-152-0x0000000000EE0000-0x0000000000EF5000-memory.dmp

Filesize
84KB

Download
memory/1772-151-0x0000000000EE0000-0x0000000000EF5000-memory.dmp

Filesize
84KB

Download
memory/1772-146-0x0000000000EE0000-0x0000000000EF5000-memory.dmp

Filesize
84KB

Download
memory/1772-145-0x0000000000000000-mapping.dmp

Download
memory/2132-140-0x0000000000000000-mapping.dmp

Download
memory/2300-149-0x0000000000552000-0x0000000000567000-memory.dmp

Filesize
84KB

Download
memory/2300-150-0x0000000000400000-0x000000000045D000-memory.dmp

Filesize
372KB

Download
memory/4080-135-0x0000000000000000-mapping.dmp

Download
memory/4172-136-0x0000000000000000-mapping.dmp

Download
memory/4620-139-0x0000000000000000-mapping.dmp

Download
memory/4656-141-0x0000000000000000-mapping.dmp

Download

Analysis

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