tofsee | ff2b1cc6b5905ea5609ffb52c098d2a2d251b1fbb28d37cac3e176203cd488fa

General

Target
3ad2aec044029075ed9c164e1681faf8.exe
Size 10.2MB
Sample231231-xt1mxafbc2
SHA256 ff2b1cc6b5905ea5609ffb52c098d2a2d251b1fbb28d37cac3e176203cd488fa
MD5 3ad2aec044029075ed9c164e1681faf8
SHA1 7b25f7895a94fb65ae9ca965c51b13c444b2b4f9
SHA512 a8d45c418c272ad341cc98064a3e42de7327d4901c1298c5dbb908e7442c71ae71681104c80dabcc620bc5679664f6732f0e0eb6d6e2f8889c5a97c9f5a92aaa
SSDEEP 6144:k5VCb4QuzFbpIozzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzn:C8NKFbp
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

C2

43.231.4.7
lazystax.ru

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
4784	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\zisvcbrn\ImagePath = "C:\\Windows\\SysWOW64\\zisvcbrn\\fkxxazpu.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-1-5-21-996941297-2279405024-2328152752-1000\Control Panel\International\Geo\Nation	3ad2aec044029075ed9c164e1681faf8.exe

Deletes itself 1 IoCs

pid	Process
2500	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
5072	fkxxazpu.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 5072 set thread context of 2500	5072	fkxxazpu.exe	106

Launches sc.exe 3 IoCs

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

pid	Process
456	sc.exe
1524	sc.exe
5064	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 23 IoCs

description	pid	Process	procid_target
PID 2240 wrote to memory of 4984	2240	3ad2aec044029075ed9c164e1681faf8.exe	91
PID 2240 wrote to memory of 4984	2240	3ad2aec044029075ed9c164e1681faf8.exe	91
PID 2240 wrote to memory of 4984	2240	3ad2aec044029075ed9c164e1681faf8.exe	91
PID 2240 wrote to memory of 2768	2240	3ad2aec044029075ed9c164e1681faf8.exe	94
PID 2240 wrote to memory of 2768	2240	3ad2aec044029075ed9c164e1681faf8.exe	94
PID 2240 wrote to memory of 2768	2240	3ad2aec044029075ed9c164e1681faf8.exe	94
PID 2240 wrote to memory of 456	2240	3ad2aec044029075ed9c164e1681faf8.exe	96
PID 2240 wrote to memory of 456	2240	3ad2aec044029075ed9c164e1681faf8.exe	96
PID 2240 wrote to memory of 456	2240	3ad2aec044029075ed9c164e1681faf8.exe	96
PID 2240 wrote to memory of 1524	2240	3ad2aec044029075ed9c164e1681faf8.exe	98
PID 2240 wrote to memory of 1524	2240	3ad2aec044029075ed9c164e1681faf8.exe	98
PID 2240 wrote to memory of 1524	2240	3ad2aec044029075ed9c164e1681faf8.exe	98
PID 2240 wrote to memory of 5064	2240	3ad2aec044029075ed9c164e1681faf8.exe	100
PID 2240 wrote to memory of 5064	2240	3ad2aec044029075ed9c164e1681faf8.exe	100
PID 2240 wrote to memory of 5064	2240	3ad2aec044029075ed9c164e1681faf8.exe	100
PID 2240 wrote to memory of 4784	2240	3ad2aec044029075ed9c164e1681faf8.exe	104
PID 2240 wrote to memory of 4784	2240	3ad2aec044029075ed9c164e1681faf8.exe	104
PID 2240 wrote to memory of 4784	2240	3ad2aec044029075ed9c164e1681faf8.exe	104
PID 5072 wrote to memory of 2500	5072	fkxxazpu.exe	106
PID 5072 wrote to memory of 2500	5072	fkxxazpu.exe	106
PID 5072 wrote to memory of 2500	5072	fkxxazpu.exe	106
PID 5072 wrote to memory of 2500	5072	fkxxazpu.exe	106
PID 5072 wrote to memory of 2500	5072	fkxxazpu.exe	106

C:\Users\Admin\AppData\Local\Temp\3ad2aec044029075ed9c164e1681faf8.exe
"C:\Users\Admin\AppData\Local\Temp\3ad2aec044029075ed9c164e1681faf8.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2240
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\zisvcbrn\
  2⤵
  PID:4984
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\fkxxazpu.exe" C:\Windows\SysWOW64\zisvcbrn\
  2⤵
  PID:2768
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create zisvcbrn binPath= "C:\Windows\SysWOW64\zisvcbrn\fkxxazpu.exe /d\"C:\Users\Admin\AppData\Local\Temp\3ad2aec044029075ed9c164e1681faf8.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:456
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description zisvcbrn "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:1524
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start zisvcbrn
  2⤵
  - Launches sc.exe
  PID:5064
- 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:4784

C:\Windows\SysWOW64\zisvcbrn\fkxxazpu.exe
C:\Windows\SysWOW64\zisvcbrn\fkxxazpu.exe /d"C:\Users\Admin\AppData\Local\Temp\3ad2aec044029075ed9c164e1681faf8.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:5072
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  PID:2500

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Create or Modify System Process

2

T1543

Windows Service

2

T1543.003

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Create or Modify System Process

2

T1543

Windows Service

2

T1543.003

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

fkxxazpu.exe

Path C:\Users\Admin\AppData\Local\Temp\fkxxazpu.exe
Size 6.0MB
SHA256 8d3c9fa3d2718d29bec1918bba040badffb66030743f896dd5c83ef90d8372cc
MD5 1712dda19756cf053522e6459242f501
SHA1 6d596a7c4c3daf1341be2897b6ec3f80613ff71e
SHA512 dbb9784d0eb872ee21e86e85ec8f0fc1117b2d9db24a928d2e7aa83f5029179c22d91f5906fcbc31dce56f929f179093cabd2ec5f880c3d706de7cc35eb3b2c0
SSDEEP 6144:f5VCb4QuzFbpIozzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzN:h8NKFbpp
MD5 SHA1 SHA512 SSDEEP

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fkxxazpu.exe

Path C:\Windows\SysWOW64\zisvcbrn\fkxxazpu.exe
Size 3.5MB
SHA256 0f36dfe1dd3b30ebe3e244a7087d61724ba24406bd30133fcc227aab853be376
MD5 784387586df5d5524cad9d1fa2e52112
SHA1 bf8a7e91c161d7d7e7401cc102b8ee6c3a9026fd
SHA512 82be6c1e761499fcce27526e618338017c06655c175896d5585e839460eb3dda484d316d7ad53576e7137a2b8579db8cb708108f37e2db49e2c3c58d442ff639
SSDEEP 6144:f5VCb4QuzFbpIozzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz2:h8NKFbp6
MD5 SHA1 SHA512 SSDEEP

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memory/2500-3-0x0000000000670000-0x0000000000685000-memory.dmp

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memory/2500-5-0x0000000000670000-0x0000000000685000-memory.dmp

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memory/2500-7-0x0000000000670000-0x0000000000685000-memory.dmp

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memory/2500-6-0x0000000000670000-0x0000000000685000-memory.dmp

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memory/2500-8-0x0000000000670000-0x0000000000685000-memory.dmp

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memory/2500-9-0x0000000000670000-0x0000000000685000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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