tofsee | 583bcd9cc37ac2f4d3f3c1c8133b3b843e851e7fba456bd189eef7090ba549f0

Analysis

max time kernel
146s
max time network
122s
platform
windows7_x64
resource
win7-20231129-en
resource tags

arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system
submitted
01/01/2024, 00:06

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General

Target
3b68da54fb8d64c5af84fceba0260579.exe
Size 10.3MB
Sample240101-adswssbba2
SHA256 583bcd9cc37ac2f4d3f3c1c8133b3b843e851e7fba456bd189eef7090ba549f0
MD5 3b68da54fb8d64c5af84fceba0260579
SHA1 accad1d4fc3dc24f172ae9530acfaaf537d7491e
SHA512 b98d7ec7c19c67ddd11eda0c2b1fd903008b7535a23bc86129797a0a7bea1f0cb747cfa2e8b87c5386bbb0f50ecb93bcbddc717d875896c12bf7bbece07540ff
SSDEEP 49152:4RBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBf:
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

43.231.4.6
lazystax.ru

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

Disable or Modify Tools

T1562.001

Modify Registry

T1112

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

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
2824	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\jyzmvcch\ImagePath = "C:\\Windows\\SysWOW64\\jyzmvcch\\jjksytvh.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
2552	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
2444	jjksytvh.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2444 set thread context of 2552	2444	jjksytvh.exe	41

Launches sc.exe 3 IoCs

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

pid	Process
2588	sc.exe
2664	sc.exe
2564	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 1868 wrote to memory of 1920	1868	3b68da54fb8d64c5af84fceba0260579.exe	29
PID 1868 wrote to memory of 1920	1868	3b68da54fb8d64c5af84fceba0260579.exe	29
PID 1868 wrote to memory of 1920	1868	3b68da54fb8d64c5af84fceba0260579.exe	29
PID 1868 wrote to memory of 1920	1868	3b68da54fb8d64c5af84fceba0260579.exe	29
PID 1868 wrote to memory of 2732	1868	3b68da54fb8d64c5af84fceba0260579.exe	31
PID 1868 wrote to memory of 2732	1868	3b68da54fb8d64c5af84fceba0260579.exe	31
PID 1868 wrote to memory of 2732	1868	3b68da54fb8d64c5af84fceba0260579.exe	31
PID 1868 wrote to memory of 2732	1868	3b68da54fb8d64c5af84fceba0260579.exe	31
PID 1868 wrote to memory of 2588	1868	3b68da54fb8d64c5af84fceba0260579.exe	33
PID 1868 wrote to memory of 2588	1868	3b68da54fb8d64c5af84fceba0260579.exe	33
PID 1868 wrote to memory of 2588	1868	3b68da54fb8d64c5af84fceba0260579.exe	33
PID 1868 wrote to memory of 2588	1868	3b68da54fb8d64c5af84fceba0260579.exe	33
PID 1868 wrote to memory of 2664	1868	3b68da54fb8d64c5af84fceba0260579.exe	35
PID 1868 wrote to memory of 2664	1868	3b68da54fb8d64c5af84fceba0260579.exe	35
PID 1868 wrote to memory of 2664	1868	3b68da54fb8d64c5af84fceba0260579.exe	35
PID 1868 wrote to memory of 2664	1868	3b68da54fb8d64c5af84fceba0260579.exe	35
PID 1868 wrote to memory of 2564	1868	3b68da54fb8d64c5af84fceba0260579.exe	37
PID 1868 wrote to memory of 2564	1868	3b68da54fb8d64c5af84fceba0260579.exe	37
PID 1868 wrote to memory of 2564	1868	3b68da54fb8d64c5af84fceba0260579.exe	37
PID 1868 wrote to memory of 2564	1868	3b68da54fb8d64c5af84fceba0260579.exe	37
PID 1868 wrote to memory of 2824	1868	3b68da54fb8d64c5af84fceba0260579.exe	39
PID 1868 wrote to memory of 2824	1868	3b68da54fb8d64c5af84fceba0260579.exe	39
PID 1868 wrote to memory of 2824	1868	3b68da54fb8d64c5af84fceba0260579.exe	39
PID 1868 wrote to memory of 2824	1868	3b68da54fb8d64c5af84fceba0260579.exe	39
PID 2444 wrote to memory of 2552	2444	jjksytvh.exe	41
PID 2444 wrote to memory of 2552	2444	jjksytvh.exe	41
PID 2444 wrote to memory of 2552	2444	jjksytvh.exe	41
PID 2444 wrote to memory of 2552	2444	jjksytvh.exe	41
PID 2444 wrote to memory of 2552	2444	jjksytvh.exe	41
PID 2444 wrote to memory of 2552	2444	jjksytvh.exe	41

C:\Users\Admin\AppData\Local\Temp\3b68da54fb8d64c5af84fceba0260579.exe
"C:\Users\Admin\AppData\Local\Temp\3b68da54fb8d64c5af84fceba0260579.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1868
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\jyzmvcch\
  2⤵
  PID:1920
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\jjksytvh.exe" C:\Windows\SysWOW64\jyzmvcch\
  2⤵
  PID:2732
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create jyzmvcch binPath= "C:\Windows\SysWOW64\jyzmvcch\jjksytvh.exe /d\"C:\Users\Admin\AppData\Local\Temp\3b68da54fb8d64c5af84fceba0260579.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:2588
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description jyzmvcch "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:2664
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start jyzmvcch
  2⤵
  - Launches sc.exe
  PID:2564
- 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:2824

C:\Windows\SysWOW64\jyzmvcch\jjksytvh.exe
C:\Windows\SysWOW64\jyzmvcch\jjksytvh.exe /d"C:\Users\Admin\AppData\Local\Temp\3b68da54fb8d64c5af84fceba0260579.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2444
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Windows security bypass
  - Sets service image path in registry
  - Deletes itself
  PID:2552

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

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

jjksytvh.exe

Path C:\Users\Admin\AppData\Local\Temp\jjksytvh.exe
Size 92KB
SHA256 3c579d9e0445e34db2102cc8e12a0db020bd4db8df4bf1a0deda3fb636ba2352
MD5 bda3261946df5cdb85e967db3db1af8a
SHA1 a1793735b3f07e347c2347559d626e50f40b43db
SHA512 e47b5b30c3222e9c9c074f0b0faaef6d2c1d51fdc186e9d19af674b6647097119f7010fa8969643b2d0249a093355d545a0711dcf8a634530e55249f2f2951ca
SSDEEP 1536:rTFwNlI8DvZK0RTg3VYUzJy5lzT84zHZV5+dTAqktudAWJ60W1O27qu+nl12KJ3L:rsB7Q0hYYseuGIBWM27t+nl12U3L
MD5 SHA1 SHA512 SSDEEP

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memory/1868-4-0x0000000000400000-0x0000000000C0A000-memory.dmp

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memory/1868-1-0x0000000000D80000-0x0000000000E80000-memory.dmp

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memory/1868-7-0x0000000000400000-0x0000000000C0A000-memory.dmp

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memory/1868-2-0x0000000000220000-0x0000000000233000-memory.dmp

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memory/2444-12-0x0000000000400000-0x0000000000C0A000-memory.dmp

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memory/2444-9-0x0000000000D50000-0x0000000000E50000-memory.dmp

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memory/2444-16-0x0000000000400000-0x0000000000C0A000-memory.dmp

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memory/2552-14-0x00000000000D0000-0x00000000000E5000-memory.dmp

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memory/2552-18-0x00000000000D0000-0x00000000000E5000-memory.dmp

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memory/2552-19-0x00000000000D0000-0x00000000000E5000-memory.dmp

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memory/2552-11-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

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memory/2552-10-0x00000000000D0000-0x00000000000E5000-memory.dmp

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memory/2552-20-0x00000000000D0000-0x00000000000E5000-memory.dmp

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Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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