tofsee | 787cc52fcb94334b237932627fa7a1a843c5a9f79b3827b1bc899773601e1d4e

Analysis

max time kernel
147s
max time network
150s
platform
windows7_x64
resource
win7-20230712-en
resource tags

arch:x64arch:x86image:win7-20230712-enlocale:en-usos:windows7-x64system
submitted
08/08/2023, 06:07

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General

Target
file.exe
Size 295KB
Sample230808-gva6mscd71
SHA256 787cc52fcb94334b237932627fa7a1a843c5a9f79b3827b1bc899773601e1d4e
MD5 5c00ce09a4e183802027bb3315473c8d
SHA1 d2cd5774fdfa0b40a26e35e74364f8b54336aefe
SHA512 f974cf2c5950803858511737a58b429d8a7156ba4394e98830bac23674eb3c32de5854685f11df4ea79add488985879bd1f865d5aa240e74c4b20021b552475f
SSDEEP 3072:M27w3MOJE+8lAgf2dgSDuZ+rowNVTdF+7fIdR3ew:zMDJql1ejQyowNVTdFqiJ
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

vanaheim.cn
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

Windows Service
T1543.003

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Windows Service

T1543.003

pid	Process
2124	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\qblzyhzl\ImagePath = "C:\\Windows\\SysWOW64\\qblzyhzl\\pwdgvjcm.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
2932	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
2864	pwdgvjcm.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2864 set thread context of 2932	2864	pwdgvjcm.exe	41

Launches sc.exe 3 IoCs

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

pid	Process
2752	sc.exe
2488	sc.exe
2872	sc.exe

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

System Information Discovery
T1082

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2068 wrote to memory of 2492	2068	file.exe	28
PID 2068 wrote to memory of 2492	2068	file.exe	28
PID 2068 wrote to memory of 2492	2068	file.exe	28
PID 2068 wrote to memory of 2492	2068	file.exe	28
PID 2068 wrote to memory of 2380	2068	file.exe	30
PID 2068 wrote to memory of 2380	2068	file.exe	30
PID 2068 wrote to memory of 2380	2068	file.exe	30
PID 2068 wrote to memory of 2380	2068	file.exe	30
PID 2068 wrote to memory of 2752	2068	file.exe	32
PID 2068 wrote to memory of 2752	2068	file.exe	32
PID 2068 wrote to memory of 2752	2068	file.exe	32
PID 2068 wrote to memory of 2752	2068	file.exe	32
PID 2068 wrote to memory of 2488	2068	file.exe	34
PID 2068 wrote to memory of 2488	2068	file.exe	34
PID 2068 wrote to memory of 2488	2068	file.exe	34
PID 2068 wrote to memory of 2488	2068	file.exe	34
PID 2068 wrote to memory of 2872	2068	file.exe	36
PID 2068 wrote to memory of 2872	2068	file.exe	36
PID 2068 wrote to memory of 2872	2068	file.exe	36
PID 2068 wrote to memory of 2872	2068	file.exe	36
PID 2068 wrote to memory of 2124	2068	file.exe	39
PID 2068 wrote to memory of 2124	2068	file.exe	39
PID 2068 wrote to memory of 2124	2068	file.exe	39
PID 2068 wrote to memory of 2124	2068	file.exe	39
PID 2864 wrote to memory of 2932	2864	pwdgvjcm.exe	41
PID 2864 wrote to memory of 2932	2864	pwdgvjcm.exe	41
PID 2864 wrote to memory of 2932	2864	pwdgvjcm.exe	41
PID 2864 wrote to memory of 2932	2864	pwdgvjcm.exe	41
PID 2864 wrote to memory of 2932	2864	pwdgvjcm.exe	41
PID 2864 wrote to memory of 2932	2864	pwdgvjcm.exe	41

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2068
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\qblzyhzl\
  2⤵
  PID:2492
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\pwdgvjcm.exe" C:\Windows\SysWOW64\qblzyhzl\
  2⤵
  PID:2380
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create qblzyhzl binPath= "C:\Windows\SysWOW64\qblzyhzl\pwdgvjcm.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:2752
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description qblzyhzl "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:2488
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start qblzyhzl
  2⤵
  - Launches sc.exe
  PID:2872
- 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:2124

C:\Windows\SysWOW64\qblzyhzl\pwdgvjcm.exe
C:\Windows\SysWOW64\qblzyhzl\pwdgvjcm.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2864
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  PID:2932

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

pwdgvjcm.exe

Path C:\Users\Admin\AppData\Local\Temp\pwdgvjcm.exe
Size 11.3MB
SHA256 e3bc1ac4c4bcbc857a6af1e7ca87c67711eef951b653b4fdb03c85885c50c9ca
MD5 e521c6976141072bd03256481b92acd2
SHA1 e24d9bef02e174f1e620e4129de6f5fe8ade7016
SHA512 59de73fe7e601c431208532f24d1f86397d7c8f1baa7bc706c365b72513750839eb4f1094bd4afb4600b641a6674b6a45aa1d7d28494a871529d01637f876de1
SSDEEP 12288:skEl1ec2LpBJkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk:sk97
MD5 SHA1 SHA512 SSDEEP

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pwdgvjcm.exe

Path C:\Windows\SysWOW64\qblzyhzl\pwdgvjcm.exe
Size 11.3MB
SHA256 e3bc1ac4c4bcbc857a6af1e7ca87c67711eef951b653b4fdb03c85885c50c9ca
MD5 e521c6976141072bd03256481b92acd2
SHA1 e24d9bef02e174f1e620e4129de6f5fe8ade7016
SHA512 59de73fe7e601c431208532f24d1f86397d7c8f1baa7bc706c365b72513750839eb4f1094bd4afb4600b641a6674b6a45aa1d7d28494a871529d01637f876de1
SSDEEP 12288:skEl1ec2LpBJkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk:sk97
MD5 SHA1 SHA512 SSDEEP

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memory/2068-56-0x0000000000400000-0x00000000022F1000-memory.dmp

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memory/2068-57-0x0000000000220000-0x0000000000233000-memory.dmp

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memory/2068-60-0x0000000000400000-0x00000000022F1000-memory.dmp

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memory/2068-54-0x00000000024D0000-0x00000000025D0000-memory.dmp

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memory/2864-68-0x00000000024A0000-0x00000000025A0000-memory.dmp

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memory/2864-62-0x00000000024A0000-0x00000000025A0000-memory.dmp

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memory/2864-82-0x0000000000400000-0x00000000022F1000-memory.dmp

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memory/2864-65-0x0000000000400000-0x00000000022F1000-memory.dmp

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memory/2864-67-0x0000000000400000-0x00000000022F1000-memory.dmp

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memory/2932-63-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/2932-80-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/2932-85-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/2932-64-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

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memory/2932-86-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/2932-87-0x0000000000080000-0x0000000000095000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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