tofsee | 85eca08e0d409e4c94322f454b9978281d4418ec61521a2feab505c76c7a6b02

General

Target

file.exe
Size

349KB
MD5

9c7cf69b45ace1ffd689b1725fd5bbfc
SHA1

b9b9677ff38eb6ee8b1b3ef85181675e84830ecf
SHA256

85eca08e0d409e4c94322f454b9978281d4418ec61521a2feab505c76c7a6b02
SHA512

9ac0e8740e8dcf989c652f6274b8023ee103a08c6b7775d658097a07a7162c27afc19d413d6b015552743a7eeafa601e38de27b1306f9d42b129cebe47683530
SSDEEP

3072:YT832BLU26yrK5sAFv0hHHyssE6QrjHwUUWQPiTdvaG9WLzjHhIh3eGjMgG1ao5e:zGBLH6yrDgchHSkfbATL/uRjMgU

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:

jphwbul.exe

pid process

4632 jphwbul.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

3872 netsh.exe

pid	process
4632	jphwbul.exe

pid	process
3872	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\mthvhpac\ImagePath = "C:\\Windows\\SysWOW64\\mthvhpac\\jphwbul.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-1-5-21-2386679933-1492765628-3466841596-1000\Control Panel\International\Geo\Nation file.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

jphwbul.exe

description pid process target process

PID 4632 set thread context of 2296 4632 jphwbul.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

4404 sc.exe
116 sc.exe
3232 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

60 1360 WerFault.exe file.exe
4960 4632 WerFault.exe jphwbul.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000\Control Panel\International\Geo\Nation	file.exe

description	pid	process	target process
PID 4632 set thread context of 2296	4632	jphwbul.exe	svchost.exe

pid	process
4404	sc.exe
116	sc.exe
3232	sc.exe

pid	pid_target	process	target process
60	1360	WerFault.exe	file.exe
4960	4632	WerFault.exe	jphwbul.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

file.exejphwbul.exe

description	pid	process	target process
PID 1360 wrote to memory of 1760	1360	file.exe	cmd.exe
PID 1360 wrote to memory of 1760	1360	file.exe	cmd.exe
PID 1360 wrote to memory of 1760	1360	file.exe	cmd.exe
PID 1360 wrote to memory of 1592	1360	file.exe	cmd.exe
PID 1360 wrote to memory of 1592	1360	file.exe	cmd.exe
PID 1360 wrote to memory of 1592	1360	file.exe	cmd.exe
PID 1360 wrote to memory of 4404	1360	file.exe	sc.exe
PID 1360 wrote to memory of 4404	1360	file.exe	sc.exe
PID 1360 wrote to memory of 4404	1360	file.exe	sc.exe
PID 1360 wrote to memory of 116	1360	file.exe	sc.exe
PID 1360 wrote to memory of 116	1360	file.exe	sc.exe
PID 1360 wrote to memory of 116	1360	file.exe	sc.exe
PID 1360 wrote to memory of 3232	1360	file.exe	sc.exe
PID 1360 wrote to memory of 3232	1360	file.exe	sc.exe
PID 1360 wrote to memory of 3232	1360	file.exe	sc.exe
PID 1360 wrote to memory of 3872	1360	file.exe	netsh.exe
PID 1360 wrote to memory of 3872	1360	file.exe	netsh.exe
PID 1360 wrote to memory of 3872	1360	file.exe	netsh.exe
PID 4632 wrote to memory of 2296	4632	jphwbul.exe	svchost.exe
PID 4632 wrote to memory of 2296	4632	jphwbul.exe	svchost.exe
PID 4632 wrote to memory of 2296	4632	jphwbul.exe	svchost.exe
PID 4632 wrote to memory of 2296	4632	jphwbul.exe	svchost.exe
PID 4632 wrote to memory of 2296	4632	jphwbul.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:1360

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\mthvhpac\
2⤵
PID:1760

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\jphwbul.exe" C:\Windows\SysWOW64\mthvhpac\
2⤵
PID:1592

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create mthvhpac binPath= "C:\Windows\SysWOW64\mthvhpac\jphwbul.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:4404

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description mthvhpac "wifi internet conection"
2⤵
- Launches sc.exe
PID:116

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start mthvhpac
2⤵
- Launches sc.exe
PID:3232

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:3872

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1360 -s 1036
2⤵
- Program crash
PID:60

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 424 -p 1360 -ip 1360
1⤵
PID:4172

C:\Windows\SysWOW64\mthvhpac\jphwbul.exe
C:\Windows\SysWOW64\mthvhpac\jphwbul.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4632

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
PID:2296

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 4632 -s 520
2⤵
- Program crash
PID:4960

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 4632 -ip 4632
1⤵
PID:4340

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\jphwbul.exe
Filesize
12.6MB

MD5
45e184dcff4a9c27044f85cf237ada24

SHA1
5ab9033ad7a19ff9047000306398a776877d7140

SHA256
260f971e4ad9f1e3590e81721390cac84a0524b68d1adc5700bea5a3efa274ea

SHA512
3028010575c2aaa12e0c17a784a260f99a46bc8b04a9e594c7b987a9779161702a6d003f299f7f2aad3a6c6bf7e74e039cde72986e128bc7f4284626b681ff3e

Download Submit
C:\Windows\SysWOW64\mthvhpac\jphwbul.exe
Filesize
12.6MB

MD5
45e184dcff4a9c27044f85cf237ada24

SHA1
5ab9033ad7a19ff9047000306398a776877d7140

SHA256
260f971e4ad9f1e3590e81721390cac84a0524b68d1adc5700bea5a3efa274ea

SHA512
3028010575c2aaa12e0c17a784a260f99a46bc8b04a9e594c7b987a9779161702a6d003f299f7f2aad3a6c6bf7e74e039cde72986e128bc7f4284626b681ff3e

Download Submit
memory/116-141-0x0000000000000000-mapping.dmp

Download
memory/1360-138-0x00000000004D7000-0x00000000004EC000-memory.dmp

Filesize
84KB

Download
memory/1360-140-0x00000000004A0000-0x00000000004B3000-memory.dmp

Filesize
76KB

Download
memory/1360-134-0x0000000000400000-0x000000000045C000-memory.dmp

Filesize
368KB

Download
memory/1360-132-0x00000000004D7000-0x00000000004EC000-memory.dmp

Filesize
84KB

Download
memory/1360-133-0x00000000004A0000-0x00000000004B3000-memory.dmp

Filesize
76KB

Download
memory/1360-145-0x0000000000400000-0x000000000045C000-memory.dmp

Filesize
368KB

Download
memory/1592-136-0x0000000000000000-mapping.dmp

Download
memory/1760-135-0x0000000000000000-mapping.dmp

Download
memory/2296-148-0x0000000000000000-mapping.dmp

Download
memory/2296-154-0x0000000000F10000-0x0000000000F25000-memory.dmp

Filesize
84KB

Download
memory/2296-153-0x0000000000F10000-0x0000000000F25000-memory.dmp

Filesize
84KB

Download
memory/2296-149-0x0000000000F10000-0x0000000000F25000-memory.dmp

Filesize
84KB

Download
memory/3232-142-0x0000000000000000-mapping.dmp

Download
memory/3872-143-0x0000000000000000-mapping.dmp

Download
memory/4404-139-0x0000000000000000-mapping.dmp

Download
memory/4632-147-0x0000000000400000-0x000000000045C000-memory.dmp

Filesize
368KB

Download
memory/4632-146-0x00000000005E1000-0x00000000005F7000-memory.dmp

Filesize
88KB

Download
memory/4632-150-0x0000000000400000-0x000000000045C000-memory.dmp

Filesize
368KB

Download

Analysis

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