tofsee | 5de55880ecb8e7bb12b9262abe470300f37cf366e208369787c5d753290e7d95

Analysis

max time kernel
149s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20221111-en
resource tags

arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
submitted
22/01/2023, 07:24

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General

Target
file.exe
Size 195KB
Sample230122-h8dpcsfe88
SHA256 5de55880ecb8e7bb12b9262abe470300f37cf366e208369787c5d753290e7d95
MD5 1d6857f7f3faee7f3016aa8c2f221423
SHA1 608494e52a324690904804bd68d3a4107b22950c
SHA512 7a0a79649981f4c8c290fc9f1ba03f6bc5c154eb7730bb00a914c304130216864044e28f361a8642b3a8309b8df57785e11f770d28e3fe845c98506183769bf5
SSDEEP 3072:fBN4X3txFXRKZBLpSv+/QDt5BZYY+PI8xrYIRLO5RU+ca6qgxEEoV3kihN:ZmqDLpSW/QDhWXPrJUca6qfEoP
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

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

pid	Process
1856	edcdeoqt.exe

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Modify Existing Service

T1031

pid	Process
3696	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\morlawte\ImagePath = "C:\\Windows\\SysWOW64\\morlawte\\edcdeoqt.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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\Control Panel\International\Geo\Nation	file.exe

Drops file in System32 directory 1 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\config\systemprofile:.repos	svchost.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1856 set thread context of 5076	1856	edcdeoqt.exe	97

Launches sc.exe 3 IoCs

Sc.exe is a Windows utlilty to control services on the system.

pid	Process
2336	sc.exe
4596	sc.exe
2172	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

pid	pid_target	Process	procid_target
4224	2600	WerFault.exe	81
3728	1856	WerFault.exe	94

Modifies data under HKEY_USERS 2 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\.DEFAULT\Control Panel\Buses	svchost.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Control Panel\Buses\Config0 = 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	svchost.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 2600 wrote to memory of 1368	2600	file.exe	82
PID 2600 wrote to memory of 1368	2600	file.exe	82
PID 2600 wrote to memory of 1368	2600	file.exe	82
PID 2600 wrote to memory of 2628	2600	file.exe	84
PID 2600 wrote to memory of 2628	2600	file.exe	84
PID 2600 wrote to memory of 2628	2600	file.exe	84
PID 2600 wrote to memory of 2172	2600	file.exe	86
PID 2600 wrote to memory of 2172	2600	file.exe	86
PID 2600 wrote to memory of 2172	2600	file.exe	86
PID 2600 wrote to memory of 2336	2600	file.exe	88
PID 2600 wrote to memory of 2336	2600	file.exe	88
PID 2600 wrote to memory of 2336	2600	file.exe	88
PID 2600 wrote to memory of 4596	2600	file.exe	91
PID 2600 wrote to memory of 4596	2600	file.exe	91
PID 2600 wrote to memory of 4596	2600	file.exe	91
PID 2600 wrote to memory of 3696	2600	file.exe	92
PID 2600 wrote to memory of 3696	2600	file.exe	92
PID 2600 wrote to memory of 3696	2600	file.exe	92
PID 1856 wrote to memory of 5076	1856	edcdeoqt.exe	97
PID 1856 wrote to memory of 5076	1856	edcdeoqt.exe	97
PID 1856 wrote to memory of 5076	1856	edcdeoqt.exe	97
PID 1856 wrote to memory of 5076	1856	edcdeoqt.exe	97
PID 1856 wrote to memory of 5076	1856	edcdeoqt.exe	97

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:2600
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\morlawte\
  2⤵
  PID:1368
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\edcdeoqt.exe" C:\Windows\SysWOW64\morlawte\
  2⤵
  PID:2628
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create morlawte binPath= "C:\Windows\SysWOW64\morlawte\edcdeoqt.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:2172
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description morlawte "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:2336
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start morlawte
  2⤵
  - Launches sc.exe
  PID:4596
- 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:3696
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2600 -s 1040
  2⤵
  - Program crash
  PID:4224

C:\Windows\SysWOW64\morlawte\edcdeoqt.exe
C:\Windows\SysWOW64\morlawte\edcdeoqt.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1856
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Drops file in System32 directory
  - Modifies data under HKEY_USERS
  PID:5076
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1856 -s 512
  2⤵
  - Program crash
  PID:3728

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 2600 -ip 2600
1⤵
PID:1452

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 500 -p 1856 -ip 1856
1⤵
PID:2940

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Modify Existing Service

T1031

New Service

T1050

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

New Service

T1050

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

edcdeoqt.exe

Path C:\Users\Admin\AppData\Local\Temp\edcdeoqt.exe
Size 11.7MB
SHA256 e5bf67672179ecdea000a73b6f1c259eddbb4e8394bc74f4653ebba21773d6f6
MD5 61c3f01e033c19681473679b8afabb49
SHA1 9f0b94d885a5ff2bfcb116b3525da0fd82649717
SHA512 abbcfcdca53a5c377e1809d38bbd5460c2b2f7c0874d5477ab7a3196dcb30e61f960497366c25e1d064dea46ebc846ead3192fa8d83dcd05d5a97b69994b4fa6
SSDEEP 3072:2BN4X3txFXRKZBLpSv+/QDt5BZYY+PI8xrYIRLO5RU+ca6qgxEEoV3kihN5N5N59:KmqDLpSW/QDhWXPrJUca6qfEoP
MD5 SHA1 SHA512 SSDEEP

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edcdeoqt.exe

Path C:\Windows\SysWOW64\morlawte\edcdeoqt.exe
Size 11.7MB
SHA256 e5bf67672179ecdea000a73b6f1c259eddbb4e8394bc74f4653ebba21773d6f6
MD5 61c3f01e033c19681473679b8afabb49
SHA1 9f0b94d885a5ff2bfcb116b3525da0fd82649717
SHA512 abbcfcdca53a5c377e1809d38bbd5460c2b2f7c0874d5477ab7a3196dcb30e61f960497366c25e1d064dea46ebc846ead3192fa8d83dcd05d5a97b69994b4fa6
SSDEEP 3072:2BN4X3txFXRKZBLpSv+/QDt5BZYY+PI8xrYIRLO5RU+ca6qgxEEoV3kihN5N5N59:KmqDLpSW/QDhWXPrJUca6qfEoP
MD5 SHA1 SHA512 SSDEEP

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memory/1856-147-0x0000000002D6A000-0x0000000002D7D000-memory.dmp

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memory/1856-148-0x0000000000400000-0x0000000002B9B000-memory.dmp

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memory/2600-150-0x0000000000400000-0x0000000002B9B000-memory.dmp

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memory/2600-133-0x0000000002F40000-0x0000000002F53000-memory.dmp

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memory/2600-134-0x0000000002D20000-0x0000000002D33000-memory.dmp

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memory/2600-135-0x0000000000400000-0x0000000002B9B000-memory.dmp

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memory/5076-144-0x0000000001260000-0x0000000001275000-memory.dmp

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memory/5076-149-0x0000000001260000-0x0000000001275000-memory.dmp

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memory/5076-151-0x0000000001260000-0x0000000001275000-memory.dmp

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Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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