tofsee | d289352c7a93aa0c2405c0f8b81162937680262984b90d27b018ba7096952219

General

Target

file.exe
Size

349KB
MD5

f085b97a4a86e373cfee621309149f70
SHA1

ea6c5f117b22fdbc40c80292eca1be2b2e03c27a
SHA256

d289352c7a93aa0c2405c0f8b81162937680262984b90d27b018ba7096952219
SHA512

7436bbe8b50fe75fc64b84de62b4abf2edc6935c50693a7df44e85ec0cb0ec372daf26587a9f810b93d7dd1f5a42cb1ef1fc7587fe76be16e489be63de024da5
SSDEEP

3072:9RZr18aXVLB9+mTtq5qcns2e9/ajB03AJfPg4asOVxFJ4trhIh3eGjMgG1ao5Lc:VOEVLr+mTnIe9/ajm8ngoa94BuRjMgU

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:

siovamqf.exe

pid process

4316 siovamqf.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

520 netsh.exe

pid	process
4316	siovamqf.exe

pid	process
520	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\wavqsvnu\ImagePath = "C:\\Windows\\SysWOW64\\wavqsvnu\\siovamqf.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-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation file.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

siovamqf.exe

description pid process target process

PID 4316 set thread context of 4296 4316 siovamqf.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

4512 sc.exe
3888 sc.exe
4248 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

1840 5064 WerFault.exe file.exe
2092 4316 WerFault.exe siovamqf.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	file.exe

description	pid	process	target process
PID 4316 set thread context of 4296	4316	siovamqf.exe	svchost.exe

pid	process
4512	sc.exe
3888	sc.exe
4248	sc.exe

pid	pid_target	process	target process
1840	5064	WerFault.exe	file.exe
2092	4316	WerFault.exe	siovamqf.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

file.exesiovamqf.exe

description	pid	process	target process
PID 5064 wrote to memory of 4760	5064	file.exe	cmd.exe
PID 5064 wrote to memory of 4760	5064	file.exe	cmd.exe
PID 5064 wrote to memory of 4760	5064	file.exe	cmd.exe
PID 5064 wrote to memory of 4796	5064	file.exe	cmd.exe
PID 5064 wrote to memory of 4796	5064	file.exe	cmd.exe
PID 5064 wrote to memory of 4796	5064	file.exe	cmd.exe
PID 5064 wrote to memory of 4512	5064	file.exe	sc.exe
PID 5064 wrote to memory of 4512	5064	file.exe	sc.exe
PID 5064 wrote to memory of 4512	5064	file.exe	sc.exe
PID 5064 wrote to memory of 3888	5064	file.exe	sc.exe
PID 5064 wrote to memory of 3888	5064	file.exe	sc.exe
PID 5064 wrote to memory of 3888	5064	file.exe	sc.exe
PID 5064 wrote to memory of 4248	5064	file.exe	sc.exe
PID 5064 wrote to memory of 4248	5064	file.exe	sc.exe
PID 5064 wrote to memory of 4248	5064	file.exe	sc.exe
PID 5064 wrote to memory of 520	5064	file.exe	netsh.exe
PID 5064 wrote to memory of 520	5064	file.exe	netsh.exe
PID 5064 wrote to memory of 520	5064	file.exe	netsh.exe
PID 4316 wrote to memory of 4296	4316	siovamqf.exe	svchost.exe
PID 4316 wrote to memory of 4296	4316	siovamqf.exe	svchost.exe
PID 4316 wrote to memory of 4296	4316	siovamqf.exe	svchost.exe
PID 4316 wrote to memory of 4296	4316	siovamqf.exe	svchost.exe
PID 4316 wrote to memory of 4296	4316	siovamqf.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:5064

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\wavqsvnu\
2⤵
PID:4760

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\siovamqf.exe" C:\Windows\SysWOW64\wavqsvnu\
2⤵
PID:4796

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create wavqsvnu binPath= "C:\Windows\SysWOW64\wavqsvnu\siovamqf.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:4512

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description wavqsvnu "wifi internet conection"
2⤵
- Launches sc.exe
PID:3888

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start wavqsvnu
2⤵
- Launches sc.exe
PID:4248

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:520

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 5064 -s 1268
2⤵
- Program crash
PID:1840

C:\Windows\SysWOW64\wavqsvnu\siovamqf.exe
C:\Windows\SysWOW64\wavqsvnu\siovamqf.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4316

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
PID:4296

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 4316 -s 516
2⤵
- Program crash
PID:2092

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 5064 -ip 5064
1⤵
PID:3456

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 560 -p 4316 -ip 4316
1⤵
PID:3848

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\siovamqf.exe
Filesize
13.9MB

MD5
59f6cc01c1a8cf6ec53c17735bc2ade0

SHA1
f3491f900cdbef774c1f867975a6942352df114d

SHA256
ea0756b9ee6d923b9ebc708834075934e55c9cac97e2a5ebc510031295da7283

SHA512
a7eace041f363ff9335bcb83cd7b1beab948b4ae67127cc2b2fc7d58b61222f0e6d56ca45cc08035c2b331dbe6355154e18086809396b9b213de09974e7aec5f

Download Submit
C:\Windows\SysWOW64\wavqsvnu\siovamqf.exe
Filesize
13.9MB

MD5
59f6cc01c1a8cf6ec53c17735bc2ade0

SHA1
f3491f900cdbef774c1f867975a6942352df114d

SHA256
ea0756b9ee6d923b9ebc708834075934e55c9cac97e2a5ebc510031295da7283

SHA512
a7eace041f363ff9335bcb83cd7b1beab948b4ae67127cc2b2fc7d58b61222f0e6d56ca45cc08035c2b331dbe6355154e18086809396b9b213de09974e7aec5f

Download Submit
memory/520-142-0x0000000000000000-mapping.dmp

Download
memory/3888-139-0x0000000000000000-mapping.dmp

Download
memory/4248-140-0x0000000000000000-mapping.dmp

Download
memory/4296-145-0x00000000012C0000-0x00000000012D5000-memory.dmp

Filesize
84KB

Download
memory/4296-144-0x0000000000000000-mapping.dmp

Download
memory/4296-150-0x00000000012C0000-0x00000000012D5000-memory.dmp

Filesize
84KB

Download
memory/4296-151-0x00000000012C0000-0x00000000012D5000-memory.dmp

Filesize
84KB

Download
memory/4316-149-0x0000000000400000-0x000000000045C000-memory.dmp

Filesize
368KB

Download
memory/4316-148-0x0000000000802000-0x0000000000817000-memory.dmp

Filesize
84KB

Download
memory/4512-138-0x0000000000000000-mapping.dmp

Download
memory/4760-135-0x0000000000000000-mapping.dmp

Download
memory/4796-136-0x0000000000000000-mapping.dmp

Download
memory/5064-134-0x0000000000400000-0x000000000045C000-memory.dmp

Filesize
368KB

Download
memory/5064-133-0x0000000000530000-0x0000000000543000-memory.dmp

Filesize
76KB

Download
memory/5064-143-0x0000000000400000-0x000000000045C000-memory.dmp

Filesize
368KB

Download
memory/5064-132-0x0000000000647000-0x000000000065C000-memory.dmp

Filesize
84KB

Download

Analysis

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