tofsee | 5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946

General

Target

5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe
Size

10.5MB
MD5

222c77202aaadbae9167f125d5235c93
SHA1

bdaa4533ebd52e7c4936cc2612ae9cc850ccdd6c
SHA256

5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946
SHA512

834691c22d611de565c4b147728f74d7cc24b623c5bdda53f43e6fc129cce765a43cfb31982618e5fb341e676adf2eb816192b1fcb26a1cd00399429db46bbbe

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:

mmnytusa.exe

pid process

3660 mmnytusa.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

3608 netsh.exe

pid	process
3660	mmnytusa.exe

pid	process
3608	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\vafyauan\ImagePath = "C:\\Windows\\SysWOW64\\vafyauan\\mmnytusa.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:

5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\Control Panel\International\Geo\Nation	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

mmnytusa.exe

description pid process target process

PID 3660 set thread context of 1236 3660 mmnytusa.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

792 sc.exe
212 sc.exe
4076 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 3660 set thread context of 1236	3660	mmnytusa.exe	svchost.exe

pid	process
792	sc.exe
212	sc.exe
4076	sc.exe

Program crash 21 IoCs

Processes:

WerFault.exeWerFault.exeWerFault.exeWerFault.exeWerFault.exeWerFault.exeWerFault.exeWerFault.exeWerFault.exeWerFault.exeWerFault.exeWerFault.exeWerFault.exeWerFault.exeWerFault.exeWerFault.exeWerFault.exeWerFault.exeWerFault.exeWerFault.exeWerFault.exe

pid	pid_target	process	target process
3576	1964	WerFault.exe	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe
1312	1964	WerFault.exe	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe
2836	1964	WerFault.exe	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe
3552	1964	WerFault.exe	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe
4724	1964	WerFault.exe	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe
4112	1964	WerFault.exe	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe
3144	1964	WerFault.exe	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe
4304	1964	WerFault.exe	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe
4540	1964	WerFault.exe	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe
4444	1964	WerFault.exe	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe
3472	1964	WerFault.exe	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe
2676	1964	WerFault.exe	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe
4764	1964	WerFault.exe	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe
4588	1964	WerFault.exe	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe
2308	1964	WerFault.exe	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe
4156	1964	WerFault.exe	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe
3672	1964	WerFault.exe	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe
1716	1964	WerFault.exe	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe
632	3660	WerFault.exe	mmnytusa.exe
1636	3660	WerFault.exe	mmnytusa.exe
2176	3660	WerFault.exe	mmnytusa.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exemmnytusa.exe

description	pid	process	target process
PID 1964 wrote to memory of 4576	1964	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	cmd.exe
PID 1964 wrote to memory of 4576	1964	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	cmd.exe
PID 1964 wrote to memory of 4576	1964	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	cmd.exe
PID 1964 wrote to memory of 1480	1964	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	cmd.exe
PID 1964 wrote to memory of 1480	1964	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	cmd.exe
PID 1964 wrote to memory of 1480	1964	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	cmd.exe
PID 1964 wrote to memory of 792	1964	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	sc.exe
PID 1964 wrote to memory of 792	1964	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	sc.exe
PID 1964 wrote to memory of 792	1964	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	sc.exe
PID 1964 wrote to memory of 212	1964	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	sc.exe
PID 1964 wrote to memory of 212	1964	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	sc.exe
PID 1964 wrote to memory of 212	1964	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	sc.exe
PID 1964 wrote to memory of 4076	1964	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	sc.exe
PID 1964 wrote to memory of 4076	1964	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	sc.exe
PID 1964 wrote to memory of 4076	1964	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	sc.exe
PID 1964 wrote to memory of 3608	1964	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	netsh.exe
PID 1964 wrote to memory of 3608	1964	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	netsh.exe
PID 1964 wrote to memory of 3608	1964	5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe	netsh.exe
PID 3660 wrote to memory of 1236	3660	mmnytusa.exe	svchost.exe
PID 3660 wrote to memory of 1236	3660	mmnytusa.exe	svchost.exe
PID 3660 wrote to memory of 1236	3660	mmnytusa.exe	svchost.exe
PID 3660 wrote to memory of 1236	3660	mmnytusa.exe	svchost.exe
PID 3660 wrote to memory of 1236	3660	mmnytusa.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe
"C:\Users\Admin\AppData\Local\Temp\5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1964

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1964 -s 604
2⤵
- Program crash
PID:3576

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1964 -s 692
2⤵
- Program crash
PID:1312

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1964 -s 844
2⤵
- Program crash
PID:2836

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1964 -s 980
2⤵
- Program crash
PID:3552

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1964 -s 736
2⤵
- Program crash
PID:4724

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1964 -s 736
2⤵
- Program crash
PID:4112

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1964 -s 840
2⤵
- Program crash
PID:3144

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\vafyauan\
2⤵
PID:4576

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1964 -s 924
2⤵
- Program crash
PID:4304

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1964 -s 1152
2⤵
- Program crash
PID:4540

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\mmnytusa.exe" C:\Windows\SysWOW64\vafyauan\
2⤵
PID:1480

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1964 -s 812
2⤵
- Program crash
PID:4444

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1964 -s 668
2⤵
- Program crash
PID:3472

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create vafyauan binPath= "C:\Windows\SysWOW64\vafyauan\mmnytusa.exe /d\"C:\Users\Admin\AppData\Local\Temp\5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:792

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1964 -s 1220
2⤵
- Program crash
PID:2676

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1964 -s 1164
2⤵
- Program crash
PID:4764

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description vafyauan "wifi internet conection"
2⤵
- Launches sc.exe
PID:212

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1964 -s 1168
2⤵
- Program crash
PID:4588

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1964 -s 1220
2⤵
- Program crash
PID:2308

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start vafyauan
2⤵
- Launches sc.exe
PID:4076

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1964 -s 812
2⤵
- Program crash
PID:4156

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1964 -s 680
2⤵
- Program crash
PID:3672

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:3608

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1964 -s 1040
2⤵
- Program crash
PID:1716

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 184 -p 1964 -ip 1964
1⤵
PID:2908

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 528 -p 1964 -ip 1964
1⤵
PID:2572

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 1964 -ip 1964
1⤵
PID:4348

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 360 -p 1964 -ip 1964
1⤵
PID:3860

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 548 -p 1964 -ip 1964
1⤵
PID:3496

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 1964 -ip 1964
1⤵
PID:3992

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 1964 -ip 1964
1⤵
PID:3564

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 1964 -ip 1964
1⤵
PID:1016

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 1964 -ip 1964
1⤵
PID:4320

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 1964 -ip 1964
1⤵
PID:2024

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 536 -p 1964 -ip 1964
1⤵
PID:3800

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 1964 -ip 1964
1⤵
PID:740

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 1964 -ip 1964
1⤵
PID:4796

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 1964 -ip 1964
1⤵
PID:224

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 500 -p 1964 -ip 1964
1⤵
PID:1668

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 1964 -ip 1964
1⤵
PID:2568

C:\Windows\SysWOW64\vafyauan\mmnytusa.exe
C:\Windows\SysWOW64\vafyauan\mmnytusa.exe /d"C:\Users\Admin\AppData\Local\Temp\5c9432e3f389b63a63d2aa8eed0e91350b86370539542f5a9f572395eabef946.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3660

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 3660 -s 536
2⤵
- Program crash
PID:632

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
PID:1236

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 3660 -s 544
2⤵
- Program crash
PID:1636

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 3660 -s 536
2⤵
- Program crash
PID:2176

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 1964 -ip 1964
1⤵
PID:3628

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 1964 -ip 1964
1⤵
PID:3716

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 544 -p 3660 -ip 3660
1⤵
PID:2440

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 560 -p 3660 -ip 3660
1⤵
PID:1840

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 3660 -ip 3660
1⤵
PID:1320

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\mmnytusa.exe
Filesize
14.7MB

MD5
06bde269eefefc468ba72c1b4cbba68d

SHA1
8de37d656292faeb9fd3fd2e55cd7eccda690caa

SHA256
48662cbe5e727debe574d0441e0b48ed0baa7565212080e08900b1b5b97ba2f4

SHA512
235a293b93ba44286611f01282dd91f6543f63963d864fd84e2a9bf472ab75f41ad61f3f36697abfe7fb2ebb7fcda7a3f95d43915fcb9e5600c274ba90a4e13e

Download Submit
C:\Windows\SysWOW64\vafyauan\mmnytusa.exe
Filesize
14.7MB

MD5
06bde269eefefc468ba72c1b4cbba68d

SHA1
8de37d656292faeb9fd3fd2e55cd7eccda690caa

SHA256
48662cbe5e727debe574d0441e0b48ed0baa7565212080e08900b1b5b97ba2f4

SHA512
235a293b93ba44286611f01282dd91f6543f63963d864fd84e2a9bf472ab75f41ad61f3f36697abfe7fb2ebb7fcda7a3f95d43915fcb9e5600c274ba90a4e13e

Download Submit
memory/212-137-0x0000000000000000-mapping.dmp

Download
memory/792-136-0x0000000000000000-mapping.dmp

Download
memory/1236-147-0x0000000000EA0000-0x0000000000EB5000-memory.dmp

Filesize
84KB

Download
memory/1236-143-0x0000000000EA0000-0x0000000000EB5000-memory.dmp

Filesize
84KB

Download
memory/1236-150-0x0000000000EA0000-0x0000000000EB5000-memory.dmp

Filesize
84KB

Download
memory/1236-142-0x0000000000000000-mapping.dmp

Download
memory/1480-134-0x0000000000000000-mapping.dmp

Download
memory/1964-146-0x0000000000400000-0x0000000002321000-memory.dmp

Filesize
31.1MB

Download
memory/1964-141-0x000000000249A000-0x00000000024A8000-memory.dmp

Filesize
56KB

Download
memory/1964-131-0x00000000023F0000-0x0000000002403000-memory.dmp

Filesize
76KB

Download
memory/1964-132-0x0000000000400000-0x0000000002321000-memory.dmp

Filesize
31.1MB

Download
memory/1964-130-0x000000000249A000-0x00000000024A8000-memory.dmp

Filesize
56KB

Download
memory/3608-140-0x0000000000000000-mapping.dmp

Download
memory/3660-148-0x0000000002595000-0x00000000025A3000-memory.dmp

Filesize
56KB

Download
memory/3660-149-0x0000000000400000-0x0000000002321000-memory.dmp

Filesize
31.1MB

Download
memory/3660-151-0x0000000000400000-0x0000000002321000-memory.dmp

Filesize
31.1MB

Download
memory/4076-138-0x0000000000000000-mapping.dmp

Download
memory/4576-133-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads