tofsee | 3bf66140ed49d2b71c6674e064b26d605f196ec45b99cc2392802313918cd4ed

General

Target

3bf66140ed49d2b71c6674e064b26d605f196ec45b99cc2392802313918cd4ed.exe
Size

104KB
MD5

cfce7e045cb6ed8bdcab5460ea2ff37a
SHA1

6bdc0c47643df5da4a583b0e23a8572a90d27ecd
SHA256

3bf66140ed49d2b71c6674e064b26d605f196ec45b99cc2392802313918cd4ed
SHA512

41d25210921915a7163daa4433a61f8c865a64829fa1d1ffd50a2dea7aa8aef66d3e7ed52229bac9e181c20b21543a3cb92251edcdce738e1735010bdba01279

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:

ydqqtsin.exe

pid process

2244 ydqqtsin.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

3476 netsh.exe

pid	process
2244	ydqqtsin.exe

pid	process
3476	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\yurorqlw\ImagePath = "C:\\Windows\\SysWOW64\\yurorqlw\\ydqqtsin.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:

3bf66140ed49d2b71c6674e064b26d605f196ec45b99cc2392802313918cd4ed.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\Control Panel\International\Geo\Nation	3bf66140ed49d2b71c6674e064b26d605f196ec45b99cc2392802313918cd4ed.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

ydqqtsin.exe

description pid process target process

PID 2244 set thread context of 4804 2244 ydqqtsin.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

60 sc.exe
3128 sc.exe
4284 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 2244 set thread context of 4804	2244	ydqqtsin.exe	svchost.exe

pid	process
60	sc.exe
3128	sc.exe
4284	sc.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

3bf66140ed49d2b71c6674e064b26d605f196ec45b99cc2392802313918cd4ed.exeydqqtsin.exe

description	pid	process	target process
PID 3292 wrote to memory of 3756	3292	3bf66140ed49d2b71c6674e064b26d605f196ec45b99cc2392802313918cd4ed.exe	cmd.exe
PID 3292 wrote to memory of 3756	3292	3bf66140ed49d2b71c6674e064b26d605f196ec45b99cc2392802313918cd4ed.exe	cmd.exe
PID 3292 wrote to memory of 3756	3292	3bf66140ed49d2b71c6674e064b26d605f196ec45b99cc2392802313918cd4ed.exe	cmd.exe
PID 3292 wrote to memory of 4188	3292	3bf66140ed49d2b71c6674e064b26d605f196ec45b99cc2392802313918cd4ed.exe	cmd.exe
PID 3292 wrote to memory of 4188	3292	3bf66140ed49d2b71c6674e064b26d605f196ec45b99cc2392802313918cd4ed.exe	cmd.exe
PID 3292 wrote to memory of 4188	3292	3bf66140ed49d2b71c6674e064b26d605f196ec45b99cc2392802313918cd4ed.exe	cmd.exe
PID 3292 wrote to memory of 60	3292	3bf66140ed49d2b71c6674e064b26d605f196ec45b99cc2392802313918cd4ed.exe	sc.exe
PID 3292 wrote to memory of 60	3292	3bf66140ed49d2b71c6674e064b26d605f196ec45b99cc2392802313918cd4ed.exe	sc.exe
PID 3292 wrote to memory of 60	3292	3bf66140ed49d2b71c6674e064b26d605f196ec45b99cc2392802313918cd4ed.exe	sc.exe
PID 3292 wrote to memory of 3128	3292	3bf66140ed49d2b71c6674e064b26d605f196ec45b99cc2392802313918cd4ed.exe	sc.exe
PID 3292 wrote to memory of 3128	3292	3bf66140ed49d2b71c6674e064b26d605f196ec45b99cc2392802313918cd4ed.exe	sc.exe
PID 3292 wrote to memory of 3128	3292	3bf66140ed49d2b71c6674e064b26d605f196ec45b99cc2392802313918cd4ed.exe	sc.exe
PID 3292 wrote to memory of 4284	3292	3bf66140ed49d2b71c6674e064b26d605f196ec45b99cc2392802313918cd4ed.exe	sc.exe
PID 3292 wrote to memory of 4284	3292	3bf66140ed49d2b71c6674e064b26d605f196ec45b99cc2392802313918cd4ed.exe	sc.exe
PID 3292 wrote to memory of 4284	3292	3bf66140ed49d2b71c6674e064b26d605f196ec45b99cc2392802313918cd4ed.exe	sc.exe
PID 3292 wrote to memory of 3476	3292	3bf66140ed49d2b71c6674e064b26d605f196ec45b99cc2392802313918cd4ed.exe	netsh.exe
PID 3292 wrote to memory of 3476	3292	3bf66140ed49d2b71c6674e064b26d605f196ec45b99cc2392802313918cd4ed.exe	netsh.exe
PID 3292 wrote to memory of 3476	3292	3bf66140ed49d2b71c6674e064b26d605f196ec45b99cc2392802313918cd4ed.exe	netsh.exe
PID 2244 wrote to memory of 4804	2244	ydqqtsin.exe	svchost.exe
PID 2244 wrote to memory of 4804	2244	ydqqtsin.exe	svchost.exe
PID 2244 wrote to memory of 4804	2244	ydqqtsin.exe	svchost.exe
PID 2244 wrote to memory of 4804	2244	ydqqtsin.exe	svchost.exe
PID 2244 wrote to memory of 4804	2244	ydqqtsin.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\3bf66140ed49d2b71c6674e064b26d605f196ec45b99cc2392802313918cd4ed.exe
"C:\Users\Admin\AppData\Local\Temp\3bf66140ed49d2b71c6674e064b26d605f196ec45b99cc2392802313918cd4ed.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3292

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yurorqlw\
2⤵
PID:3756

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ydqqtsin.exe" C:\Windows\SysWOW64\yurorqlw\
2⤵
PID:4188

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create yurorqlw binPath= "C:\Windows\SysWOW64\yurorqlw\ydqqtsin.exe /d\"C:\Users\Admin\AppData\Local\Temp\3bf66140ed49d2b71c6674e064b26d605f196ec45b99cc2392802313918cd4ed.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:60

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description yurorqlw "wifi internet conection"
2⤵
- Launches sc.exe
PID:3128

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start yurorqlw
2⤵
- Launches sc.exe
PID:4284

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:3476

C:\Windows\SysWOW64\yurorqlw\ydqqtsin.exe
C:\Windows\SysWOW64\yurorqlw\ydqqtsin.exe /d"C:\Users\Admin\AppData\Local\Temp\3bf66140ed49d2b71c6674e064b26d605f196ec45b99cc2392802313918cd4ed.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2244

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
PID:4804

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\ydqqtsin.exe
Filesize
12.2MB

MD5
87a9c3fc114d54f9f6442c1ff5f556b6

SHA1
d3d8b272264e3102607c61356e14a25bbaff3d6f

SHA256
b711395ea04286f421570c26e136c27a4e707c671e324d4245ffa81e2ce183ad

SHA512
f7ee2714f195cd2770c72e632d8c7f455828d37ddd9a97700df57c58de2ae7e1c47bb88bef5e7f2748ba5e94cd561f8004aef0e67a9834fbb0770feec313d8f9

Download Submit
C:\Windows\SysWOW64\yurorqlw\ydqqtsin.exe
Filesize
12.2MB

MD5
87a9c3fc114d54f9f6442c1ff5f556b6

SHA1
d3d8b272264e3102607c61356e14a25bbaff3d6f

SHA256
b711395ea04286f421570c26e136c27a4e707c671e324d4245ffa81e2ce183ad

SHA512
f7ee2714f195cd2770c72e632d8c7f455828d37ddd9a97700df57c58de2ae7e1c47bb88bef5e7f2748ba5e94cd561f8004aef0e67a9834fbb0770feec313d8f9

Download Submit
memory/60-134-0x0000000000000000-mapping.dmp

Download
memory/2244-139-0x0000000000400000-0x000000000041D000-memory.dmp

Filesize
116KB

Download
memory/3128-135-0x0000000000000000-mapping.dmp

Download
memory/3292-130-0x0000000000400000-0x000000000041D000-memory.dmp

Filesize
116KB

Download
memory/3476-137-0x0000000000000000-mapping.dmp

Download
memory/3756-131-0x0000000000000000-mapping.dmp

Download
memory/4188-132-0x0000000000000000-mapping.dmp

Download
memory/4284-136-0x0000000000000000-mapping.dmp

Download
memory/4804-140-0x0000000000000000-mapping.dmp

Download
memory/4804-141-0x00000000001A0000-0x00000000001B5000-memory.dmp

Filesize
84KB

Download
memory/4804-144-0x00000000001A0000-0x00000000001B5000-memory.dmp

Filesize
84KB

Download
memory/4804-145-0x00000000001A0000-0x00000000001B5000-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