tofsee | 662a375950d1b16ceb51ea7d50fbaa9121f087d7d148d3be65705a2c4b8b3d08

General

Target

file.exe
Size

146KB
MD5

1fd5ff320a44cfc6d33a505c24efa590
SHA1

6db5b5667f7861e163344f95ec9f0f3616d14130
SHA256

662a375950d1b16ceb51ea7d50fbaa9121f087d7d148d3be65705a2c4b8b3d08
SHA512

83177f1f72249deaca68249ee5b2f4b755dd0481fb7b24c55f3f28183d5b54edf40f4e330bb00156210eea1f6d73414474df4f3b5b8b69cb14150d058983c29d
SSDEEP

3072:/EBurucqyxil650IRnGOamWe3BYL7aoBUSl3X:cVcqd6Bg7aj+n

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:

jlozuode.exe

pid process

2200 jlozuode.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

2084 netsh.exe

pid	process
2200	jlozuode.exe

pid	process
2084	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\vulgkvsu\ImagePath = "C:\\Windows\\SysWOW64\\vulgkvsu\\jlozuode.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-1-5-21-2891029575-1462575-1165213807-1000\Control Panel\International\Geo\Nation file.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

jlozuode.exe

description pid process target process

PID 2200 set thread context of 4724 2200 jlozuode.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

3744 sc.exe
1520 sc.exe
224 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

1072 2472 WerFault.exe file.exe
1768 2200 WerFault.exe jlozuode.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Control Panel\International\Geo\Nation	file.exe

description	pid	process	target process
PID 2200 set thread context of 4724	2200	jlozuode.exe	svchost.exe

pid	process
3744	sc.exe
1520	sc.exe
224	sc.exe

pid	pid_target	process	target process
1072	2472	WerFault.exe	file.exe
1768	2200	WerFault.exe	jlozuode.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

file.exejlozuode.exe

description	pid	process	target process
PID 2472 wrote to memory of 3508	2472	file.exe	cmd.exe
PID 2472 wrote to memory of 3508	2472	file.exe	cmd.exe
PID 2472 wrote to memory of 3508	2472	file.exe	cmd.exe
PID 2472 wrote to memory of 1576	2472	file.exe	cmd.exe
PID 2472 wrote to memory of 1576	2472	file.exe	cmd.exe
PID 2472 wrote to memory of 1576	2472	file.exe	cmd.exe
PID 2472 wrote to memory of 3744	2472	file.exe	sc.exe
PID 2472 wrote to memory of 3744	2472	file.exe	sc.exe
PID 2472 wrote to memory of 3744	2472	file.exe	sc.exe
PID 2472 wrote to memory of 1520	2472	file.exe	sc.exe
PID 2472 wrote to memory of 1520	2472	file.exe	sc.exe
PID 2472 wrote to memory of 1520	2472	file.exe	sc.exe
PID 2472 wrote to memory of 224	2472	file.exe	sc.exe
PID 2472 wrote to memory of 224	2472	file.exe	sc.exe
PID 2472 wrote to memory of 224	2472	file.exe	sc.exe
PID 2472 wrote to memory of 2084	2472	file.exe	netsh.exe
PID 2472 wrote to memory of 2084	2472	file.exe	netsh.exe
PID 2472 wrote to memory of 2084	2472	file.exe	netsh.exe
PID 2200 wrote to memory of 4724	2200	jlozuode.exe	svchost.exe
PID 2200 wrote to memory of 4724	2200	jlozuode.exe	svchost.exe
PID 2200 wrote to memory of 4724	2200	jlozuode.exe	svchost.exe
PID 2200 wrote to memory of 4724	2200	jlozuode.exe	svchost.exe
PID 2200 wrote to memory of 4724	2200	jlozuode.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:2472

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\vulgkvsu\
2⤵
PID:3508

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\jlozuode.exe" C:\Windows\SysWOW64\vulgkvsu\
2⤵
PID:1576

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create vulgkvsu binPath= "C:\Windows\SysWOW64\vulgkvsu\jlozuode.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:3744

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description vulgkvsu "wifi internet conection"
2⤵
- Launches sc.exe
PID:1520

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start vulgkvsu
2⤵
- Launches sc.exe
PID:224

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:2084

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 2472 -s 1036
2⤵
- Program crash
PID:1072

C:\Windows\SysWOW64\vulgkvsu\jlozuode.exe
C:\Windows\SysWOW64\vulgkvsu\jlozuode.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2200

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
PID:4724

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 2200 -s 516
2⤵
- Program crash
PID:1768

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2472 -ip 2472
1⤵
PID:4480

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 2200 -ip 2200
1⤵
PID:2176

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\jlozuode.exe
Filesize
12.1MB

MD5
8e48e7b1f09bbbfc25765f5a52ad1104

SHA1
6d07d5aa8fe19258c19a390272947a5ccd47f93f

SHA256
09f28a15b4065e1b224e544c4f62c36e1c0aab87531b8c7664090f875aefc9f0

SHA512
6a5211a6f088ea99455a3d5a7ff6ccbab8fb58dd35266748a61a2960ff1d68f31a6595dc3179cef34541dd0f0857383c8ff810eb0f440d068f67772a17f31add

Download Submit
C:\Windows\SysWOW64\vulgkvsu\jlozuode.exe
Filesize
12.1MB

MD5
8e48e7b1f09bbbfc25765f5a52ad1104

SHA1
6d07d5aa8fe19258c19a390272947a5ccd47f93f

SHA256
09f28a15b4065e1b224e544c4f62c36e1c0aab87531b8c7664090f875aefc9f0

SHA512
6a5211a6f088ea99455a3d5a7ff6ccbab8fb58dd35266748a61a2960ff1d68f31a6595dc3179cef34541dd0f0857383c8ff810eb0f440d068f67772a17f31add

Download Submit
memory/224-140-0x0000000000000000-mapping.dmp

Download
memory/1520-139-0x0000000000000000-mapping.dmp

Download
memory/1576-136-0x0000000000000000-mapping.dmp

Download
memory/2084-142-0x0000000000000000-mapping.dmp

Download
memory/2200-149-0x0000000000D58000-0x0000000000D69000-memory.dmp

Filesize
68KB

Download
memory/2200-152-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download
memory/2200-150-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download
memory/2472-133-0x0000000002810000-0x0000000002823000-memory.dmp

Filesize
76KB

Download
memory/2472-132-0x0000000000BAD000-0x0000000000BBD000-memory.dmp

Filesize
64KB

Download
memory/2472-143-0x0000000002810000-0x0000000002823000-memory.dmp

Filesize
76KB

Download
memory/2472-144-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download
memory/2472-134-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download
memory/3508-135-0x0000000000000000-mapping.dmp

Download
memory/3744-138-0x0000000000000000-mapping.dmp

Download
memory/4724-145-0x0000000000000000-mapping.dmp

Download
memory/4724-146-0x0000000001240000-0x0000000001255000-memory.dmp

Filesize
84KB

Download
memory/4724-151-0x0000000001240000-0x0000000001255000-memory.dmp

Filesize
84KB

Download
memory/4724-153-0x0000000001240000-0x0000000001255000-memory.dmp

Filesize
84KB

Download

Analysis

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