tofsee | 5de55880ecb8e7bb12b9262abe470300f37cf366e208369787c5d753290e7d95

Analysis

max time kernel
150s
max time network
143s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-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

Windows security bypass 2 TTPs 1 IoCs

evasion trojan

Disabling Security Tools

T1089

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Windows\SysWOW64\ktqsjedf = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

New Service
T1050

Executes dropped EXE 1 IoCs

pid	Process
1684	ixlibhdg.exe

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Modify Existing Service

T1031

pid	Process
516	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\ktqsjedf\ImagePath = "C:\\Windows\\SysWOW64\\ktqsjedf\\ixlibhdg.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
1516	svchost.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1684 set thread context of 1516	1684	ixlibhdg.exe	41

Launches sc.exe 3 IoCs

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

pid	Process
852	sc.exe
340	sc.exe
1900	sc.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 1908 wrote to memory of 844	1908	file.exe	28
PID 1908 wrote to memory of 844	1908	file.exe	28
PID 1908 wrote to memory of 844	1908	file.exe	28
PID 1908 wrote to memory of 844	1908	file.exe	28
PID 1908 wrote to memory of 1336	1908	file.exe	30
PID 1908 wrote to memory of 1336	1908	file.exe	30
PID 1908 wrote to memory of 1336	1908	file.exe	30
PID 1908 wrote to memory of 1336	1908	file.exe	30
PID 1908 wrote to memory of 852	1908	file.exe	32
PID 1908 wrote to memory of 852	1908	file.exe	32
PID 1908 wrote to memory of 852	1908	file.exe	32
PID 1908 wrote to memory of 852	1908	file.exe	32
PID 1908 wrote to memory of 340	1908	file.exe	34
PID 1908 wrote to memory of 340	1908	file.exe	34
PID 1908 wrote to memory of 340	1908	file.exe	34
PID 1908 wrote to memory of 340	1908	file.exe	34
PID 1908 wrote to memory of 1900	1908	file.exe	36
PID 1908 wrote to memory of 1900	1908	file.exe	36
PID 1908 wrote to memory of 1900	1908	file.exe	36
PID 1908 wrote to memory of 1900	1908	file.exe	36
PID 1908 wrote to memory of 516	1908	file.exe	39
PID 1908 wrote to memory of 516	1908	file.exe	39
PID 1908 wrote to memory of 516	1908	file.exe	39
PID 1908 wrote to memory of 516	1908	file.exe	39
PID 1684 wrote to memory of 1516	1684	ixlibhdg.exe	41
PID 1684 wrote to memory of 1516	1684	ixlibhdg.exe	41
PID 1684 wrote to memory of 1516	1684	ixlibhdg.exe	41
PID 1684 wrote to memory of 1516	1684	ixlibhdg.exe	41
PID 1684 wrote to memory of 1516	1684	ixlibhdg.exe	41
PID 1684 wrote to memory of 1516	1684	ixlibhdg.exe	41

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1908
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ktqsjedf\
  2⤵
  PID:844
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ixlibhdg.exe" C:\Windows\SysWOW64\ktqsjedf\
  2⤵
  PID:1336
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create ktqsjedf binPath= "C:\Windows\SysWOW64\ktqsjedf\ixlibhdg.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:852
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description ktqsjedf "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:340
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start ktqsjedf
  2⤵
  - Launches sc.exe
  PID:1900
- 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:516

C:\Windows\SysWOW64\ktqsjedf\ixlibhdg.exe
C:\Windows\SysWOW64\ktqsjedf\ixlibhdg.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1684
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Windows security bypass
  - Sets service image path in registry
  - Deletes itself
  PID:1516

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

Disabling Security Tools

T1089

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

ixlibhdg.exe

Path C:\Users\Admin\AppData\Local\Temp\ixlibhdg.exe
Size 14.4MB
SHA256 7d3dd189fd8c7e0323b6a72334cc77daeec4d59bcee0545bd9afd935b55c5c05
MD5 3d148ac903fb2ff7ba6d9779a5af5d43
SHA1 484522cd798148c88f2e04f36122569467ca62db
SHA512 545ab8285353b4c80aa1df17adf9e3f6f120f137f3cd096295155167ee807a86aacac64bcc5eeb935d9caf17ba602eb37ac67369a0ae8de4e5b111070f27ce16
SSDEEP 3072:yBN4X3txFXRKZBLpSv+/QDt5BZYY+PI8xrYIRLO5RU+ca6qgxEEoV3kihN5N5N59:mmqDLpSW/QDhWXPrJUca6qfEoP
MD5 SHA1 SHA512 SSDEEP

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ixlibhdg.exe

Path C:\Windows\SysWOW64\ktqsjedf\ixlibhdg.exe
Size 14.4MB
SHA256 7d3dd189fd8c7e0323b6a72334cc77daeec4d59bcee0545bd9afd935b55c5c05
MD5 3d148ac903fb2ff7ba6d9779a5af5d43
SHA1 484522cd798148c88f2e04f36122569467ca62db
SHA512 545ab8285353b4c80aa1df17adf9e3f6f120f137f3cd096295155167ee807a86aacac64bcc5eeb935d9caf17ba602eb37ac67369a0ae8de4e5b111070f27ce16
SSDEEP 3072:yBN4X3txFXRKZBLpSv+/QDt5BZYY+PI8xrYIRLO5RU+ca6qgxEEoV3kihN5N5N59:mmqDLpSW/QDhWXPrJUca6qfEoP
MD5 SHA1 SHA512 SSDEEP

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memory/1516-72-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/1516-80-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/1516-79-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/1516-70-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/1684-78-0x0000000000400000-0x0000000002B9B000-memory.dmp

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memory/1684-75-0x0000000002CCE000-0x0000000002CE1000-memory.dmp

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memory/1908-57-0x0000000000220000-0x0000000000233000-memory.dmp

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memory/1908-68-0x0000000000400000-0x0000000002B9B000-memory.dmp

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memory/1908-67-0x0000000002CFE000-0x0000000002D11000-memory.dmp

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memory/1908-56-0x0000000002CFE000-0x0000000002D11000-memory.dmp

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memory/1908-54-0x00000000762F1000-0x00000000762F3000-memory.dmp

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memory/1908-58-0x0000000000400000-0x0000000002B9B000-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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