tofsee | 34c414bf27ed2603e855e7ad3578a9ac86b03faa1a7db3278cedead5ffa1458c

General

Target

34c414bf27ed2603e855e7ad3578a9ac86b03faa1a7db3278cedead5ffa1458c.exe
Size

104KB
MD5

b8aefed6abece4f59edf9567a0cafed5
SHA1

df318db2b549a7a6e6bf51fbf3a55627bc8a8f1c
SHA256

34c414bf27ed2603e855e7ad3578a9ac86b03faa1a7db3278cedead5ffa1458c
SHA512

c7671d6482045f57db20d9c4e5113843b32af79d0a7f04f916caa44d83a8f0a7733801d7cf202e52418432a79cbd324947a8583ae39866b5619889f4ddb69bdf

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

C2

43.231.4.7

lazystax.ru

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:

smolfblq.exe

pid process

4048 smolfblq.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

3524 netsh.exe

pid	process
4048	smolfblq.exe

pid	process
3524	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\unhevvvs\ImagePath = "C:\\Windows\\SysWOW64\\unhevvvs\\smolfblq.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:

34c414bf27ed2603e855e7ad3578a9ac86b03faa1a7db3278cedead5ffa1458c.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1081944012-3634099177-1681222835-1000\Control Panel\International\Geo\Nation	34c414bf27ed2603e855e7ad3578a9ac86b03faa1a7db3278cedead5ffa1458c.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

smolfblq.exe

description pid process target process

PID 4048 set thread context of 5088 4048 smolfblq.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

4848 sc.exe
4120 sc.exe
4004 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

description	pid	process	target process
PID 4048 set thread context of 5088	4048	smolfblq.exe	svchost.exe

pid	process
4848	sc.exe
4120	sc.exe
4004	sc.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

34c414bf27ed2603e855e7ad3578a9ac86b03faa1a7db3278cedead5ffa1458c.exesmolfblq.exe

description	pid	process	target process
PID 736 wrote to memory of 2076	736	34c414bf27ed2603e855e7ad3578a9ac86b03faa1a7db3278cedead5ffa1458c.exe	cmd.exe
PID 736 wrote to memory of 2076	736	34c414bf27ed2603e855e7ad3578a9ac86b03faa1a7db3278cedead5ffa1458c.exe	cmd.exe
PID 736 wrote to memory of 2076	736	34c414bf27ed2603e855e7ad3578a9ac86b03faa1a7db3278cedead5ffa1458c.exe	cmd.exe
PID 736 wrote to memory of 3752	736	34c414bf27ed2603e855e7ad3578a9ac86b03faa1a7db3278cedead5ffa1458c.exe	cmd.exe
PID 736 wrote to memory of 3752	736	34c414bf27ed2603e855e7ad3578a9ac86b03faa1a7db3278cedead5ffa1458c.exe	cmd.exe
PID 736 wrote to memory of 3752	736	34c414bf27ed2603e855e7ad3578a9ac86b03faa1a7db3278cedead5ffa1458c.exe	cmd.exe
PID 736 wrote to memory of 4120	736	34c414bf27ed2603e855e7ad3578a9ac86b03faa1a7db3278cedead5ffa1458c.exe	sc.exe
PID 736 wrote to memory of 4120	736	34c414bf27ed2603e855e7ad3578a9ac86b03faa1a7db3278cedead5ffa1458c.exe	sc.exe
PID 736 wrote to memory of 4120	736	34c414bf27ed2603e855e7ad3578a9ac86b03faa1a7db3278cedead5ffa1458c.exe	sc.exe
PID 736 wrote to memory of 4004	736	34c414bf27ed2603e855e7ad3578a9ac86b03faa1a7db3278cedead5ffa1458c.exe	sc.exe
PID 736 wrote to memory of 4004	736	34c414bf27ed2603e855e7ad3578a9ac86b03faa1a7db3278cedead5ffa1458c.exe	sc.exe
PID 736 wrote to memory of 4004	736	34c414bf27ed2603e855e7ad3578a9ac86b03faa1a7db3278cedead5ffa1458c.exe	sc.exe
PID 736 wrote to memory of 4848	736	34c414bf27ed2603e855e7ad3578a9ac86b03faa1a7db3278cedead5ffa1458c.exe	sc.exe
PID 736 wrote to memory of 4848	736	34c414bf27ed2603e855e7ad3578a9ac86b03faa1a7db3278cedead5ffa1458c.exe	sc.exe
PID 736 wrote to memory of 4848	736	34c414bf27ed2603e855e7ad3578a9ac86b03faa1a7db3278cedead5ffa1458c.exe	sc.exe
PID 736 wrote to memory of 3524	736	34c414bf27ed2603e855e7ad3578a9ac86b03faa1a7db3278cedead5ffa1458c.exe	netsh.exe
PID 736 wrote to memory of 3524	736	34c414bf27ed2603e855e7ad3578a9ac86b03faa1a7db3278cedead5ffa1458c.exe	netsh.exe
PID 736 wrote to memory of 3524	736	34c414bf27ed2603e855e7ad3578a9ac86b03faa1a7db3278cedead5ffa1458c.exe	netsh.exe
PID 4048 wrote to memory of 5088	4048	smolfblq.exe	svchost.exe
PID 4048 wrote to memory of 5088	4048	smolfblq.exe	svchost.exe
PID 4048 wrote to memory of 5088	4048	smolfblq.exe	svchost.exe
PID 4048 wrote to memory of 5088	4048	smolfblq.exe	svchost.exe
PID 4048 wrote to memory of 5088	4048	smolfblq.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\34c414bf27ed2603e855e7ad3578a9ac86b03faa1a7db3278cedead5ffa1458c.exe
"C:\Users\Admin\AppData\Local\Temp\34c414bf27ed2603e855e7ad3578a9ac86b03faa1a7db3278cedead5ffa1458c.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:736

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\unhevvvs\
2⤵
PID:2076

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\smolfblq.exe" C:\Windows\SysWOW64\unhevvvs\
2⤵
PID:3752

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create unhevvvs binPath= "C:\Windows\SysWOW64\unhevvvs\smolfblq.exe /d\"C:\Users\Admin\AppData\Local\Temp\34c414bf27ed2603e855e7ad3578a9ac86b03faa1a7db3278cedead5ffa1458c.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:4120

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description unhevvvs "wifi internet conection"
2⤵
- Launches sc.exe
PID:4004

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start unhevvvs
2⤵
- Launches sc.exe
PID:4848

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:3524

C:\Windows\SysWOW64\unhevvvs\smolfblq.exe
C:\Windows\SysWOW64\unhevvvs\smolfblq.exe /d"C:\Users\Admin\AppData\Local\Temp\34c414bf27ed2603e855e7ad3578a9ac86b03faa1a7db3278cedead5ffa1458c.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4048

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
PID:5088

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

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Downloads

C:\Users\Admin\AppData\Local\Temp\smolfblq.exe
Filesize
10.2MB

MD5
21f19472aa11bc56f356cb6b25f3b764

SHA1
b541cd6394a0b823eb18759f4dbbecd0d6aef473

SHA256
afd8c4bb5fbc2905695508ec761587b210bfc833630d2e2e382d90e0f3c7322e

SHA512
ddfed729130cfc6dd331562f0f768fc0a0187d6bbbd17735bf835d14ca111cbb40110e7282dcc1d7a37bff27f110ad7750322b00ec2984dd8b028a151f231bee

Download Submit
C:\Windows\SysWOW64\unhevvvs\smolfblq.exe
Filesize
10.2MB

MD5
21f19472aa11bc56f356cb6b25f3b764

SHA1
b541cd6394a0b823eb18759f4dbbecd0d6aef473

SHA256
afd8c4bb5fbc2905695508ec761587b210bfc833630d2e2e382d90e0f3c7322e

SHA512
ddfed729130cfc6dd331562f0f768fc0a0187d6bbbd17735bf835d14ca111cbb40110e7282dcc1d7a37bff27f110ad7750322b00ec2984dd8b028a151f231bee

Download Submit
memory/736-130-0x0000000000400000-0x000000000041D000-memory.dmp

Filesize
116KB

Download
memory/2076-131-0x0000000000000000-mapping.dmp

Download
memory/3524-137-0x0000000000000000-mapping.dmp

Download
memory/3752-132-0x0000000000000000-mapping.dmp

Download
memory/4004-135-0x0000000000000000-mapping.dmp

Download
memory/4048-139-0x0000000000400000-0x000000000041D000-memory.dmp

Filesize
116KB

Download
memory/4120-133-0x0000000000000000-mapping.dmp

Download
memory/4848-136-0x0000000000000000-mapping.dmp

Download
memory/5088-140-0x0000000000000000-mapping.dmp

Download
memory/5088-141-0x0000000000660000-0x0000000000675000-memory.dmp

Filesize
84KB

Download
memory/5088-144-0x0000000000660000-0x0000000000675000-memory.dmp

Filesize
84KB

Download
memory/5088-145-0x0000000000660000-0x0000000000675000-memory.dmp

Filesize
84KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads