tofsee | 65757b57e365632cbb09a09c18fe86a67aa5d53c8fd9da23ee7842d8a46055a8

Analysis

max time kernel
145s
max time network
139s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
24/10/2022, 08:39

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General

Target
file.exe
Size 230KB
Sample221024-kkac5sffgn
SHA256 65757b57e365632cbb09a09c18fe86a67aa5d53c8fd9da23ee7842d8a46055a8
MD5 988e00b9de7bc68ba25bd87abfc5ee1e
SHA1 9e8d0636f82a04cb3be147fcd4cbb2b135e7ffe1
SHA512 dd34e8e544f985505b8b047f453759e368a831ebf25cf07008d8466de174153287c3bc2ae3f6a2a3b2f8c1610176f33c71359c1f22fba3e945703cc05afde259
SSDEEP 6144:v73P/9LU1sRQa338j2WKpmWj7GwWtseqTj:v7fVoEQa33fWCLWwWtW3
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\lddxpirz = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

New Service
T1050

Executes dropped EXE 1 IoCs

pid	Process
524	tjcaxgnm.exe

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Modify Existing Service

T1031

pid	Process
1472	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\lddxpirz\ImagePath = "C:\\Windows\\SysWOW64\\lddxpirz\\tjcaxgnm.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
1948	svchost.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 524 set thread context of 1948	524	tjcaxgnm.exe	41

Launches sc.exe 3 IoCs

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

pid	Process
856	sc.exe
1244	sc.exe
2044	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 1576 wrote to memory of 1908	1576	file.exe	28
PID 1576 wrote to memory of 1908	1576	file.exe	28
PID 1576 wrote to memory of 1908	1576	file.exe	28
PID 1576 wrote to memory of 1908	1576	file.exe	28
PID 1576 wrote to memory of 976	1576	file.exe	30
PID 1576 wrote to memory of 976	1576	file.exe	30
PID 1576 wrote to memory of 976	1576	file.exe	30
PID 1576 wrote to memory of 976	1576	file.exe	30
PID 1576 wrote to memory of 856	1576	file.exe	32
PID 1576 wrote to memory of 856	1576	file.exe	32
PID 1576 wrote to memory of 856	1576	file.exe	32
PID 1576 wrote to memory of 856	1576	file.exe	32
PID 1576 wrote to memory of 1244	1576	file.exe	34
PID 1576 wrote to memory of 1244	1576	file.exe	34
PID 1576 wrote to memory of 1244	1576	file.exe	34
PID 1576 wrote to memory of 1244	1576	file.exe	34
PID 1576 wrote to memory of 2044	1576	file.exe	36
PID 1576 wrote to memory of 2044	1576	file.exe	36
PID 1576 wrote to memory of 2044	1576	file.exe	36
PID 1576 wrote to memory of 2044	1576	file.exe	36
PID 1576 wrote to memory of 1472	1576	file.exe	39
PID 1576 wrote to memory of 1472	1576	file.exe	39
PID 1576 wrote to memory of 1472	1576	file.exe	39
PID 1576 wrote to memory of 1472	1576	file.exe	39
PID 524 wrote to memory of 1948	524	tjcaxgnm.exe	41
PID 524 wrote to memory of 1948	524	tjcaxgnm.exe	41
PID 524 wrote to memory of 1948	524	tjcaxgnm.exe	41
PID 524 wrote to memory of 1948	524	tjcaxgnm.exe	41
PID 524 wrote to memory of 1948	524	tjcaxgnm.exe	41
PID 524 wrote to memory of 1948	524	tjcaxgnm.exe	41

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1576
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\lddxpirz\
  2⤵
  PID:1908
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\tjcaxgnm.exe" C:\Windows\SysWOW64\lddxpirz\
  2⤵
  PID:976
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create lddxpirz binPath= "C:\Windows\SysWOW64\lddxpirz\tjcaxgnm.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:856
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description lddxpirz "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:1244
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start lddxpirz
  2⤵
  - Launches sc.exe
  PID:2044
- 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:1472

C:\Windows\SysWOW64\lddxpirz\tjcaxgnm.exe
C:\Windows\SysWOW64\lddxpirz\tjcaxgnm.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:524
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Windows security bypass
  - Sets service image path in registry
  - Deletes itself
  PID:1948

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

tjcaxgnm.exe

Path C:\Users\Admin\AppData\Local\Temp\tjcaxgnm.exe
Size 13.4MB
SHA256 ebb24a8ff08b8a40e284609c21d02f264c11da6a9ac0e69651d87c44a9574f0a
MD5 b02584adbdf1cc07a09000877bc75474
SHA1 b30cbac9e33656f7e3f29f3a70dd3465c4821e02
SHA512 56c6b3708187a92dcf084f5d5f5fb040d57088c70660e74b3f8df3e539c354b3fbf89137af9705afd2702c1a359da56c988dae6cd740e35073555a230a2953d1
SSDEEP 12288:o7fVoEQa33fWCLWwWtW31111111111111111111111111111111111111111111d:oDSanf7i
MD5 SHA1 SHA512 SSDEEP

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tjcaxgnm.exe

Path C:\Windows\SysWOW64\lddxpirz\tjcaxgnm.exe
Size 13.4MB
SHA256 ebb24a8ff08b8a40e284609c21d02f264c11da6a9ac0e69651d87c44a9574f0a
MD5 b02584adbdf1cc07a09000877bc75474
SHA1 b30cbac9e33656f7e3f29f3a70dd3465c4821e02
SHA512 56c6b3708187a92dcf084f5d5f5fb040d57088c70660e74b3f8df3e539c354b3fbf89137af9705afd2702c1a359da56c988dae6cd740e35073555a230a2953d1
SSDEEP 12288:o7fVoEQa33fWCLWwWtW31111111111111111111111111111111111111111111d:oDSanf7i
MD5 SHA1 SHA512 SSDEEP

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memory/524-80-0x0000000000400000-0x0000000000597000-memory.dmp

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memory/524-78-0x00000000002E8000-0x00000000002F9000-memory.dmp

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memory/524-66-0x00000000002E8000-0x00000000002F9000-memory.dmp

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memory/1576-70-0x0000000000400000-0x0000000000597000-memory.dmp

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memory/1576-55-0x0000000075B11000-0x0000000075B13000-memory.dmp

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memory/1576-59-0x0000000000400000-0x0000000000597000-memory.dmp

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memory/1576-57-0x00000000002C8000-0x00000000002D9000-memory.dmp

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memory/1576-58-0x00000000001B0000-0x00000000001C3000-memory.dmp

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memory/1576-69-0x00000000002C8000-0x00000000002D9000-memory.dmp

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memory/1576-54-0x00000000002C8000-0x00000000002D9000-memory.dmp

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memory/1948-72-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/1948-74-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/1948-81-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/1948-82-0x0000000000080000-0x0000000000095000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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