tofsee | 6a7b41efa4831599f18fc65fef165a9fd49aa3210eb715a6253487d2bc7572dd

Analysis

max time kernel
149s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
25/03/2024, 03:37

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General

Target
dd2449cc99a8ebb87ee86c1500f97a41.exe
Size 14.4MB
Sample240325-d6f99aaa4t
SHA256 6a7b41efa4831599f18fc65fef165a9fd49aa3210eb715a6253487d2bc7572dd
MD5 dd2449cc99a8ebb87ee86c1500f97a41
SHA1 d380615538d78ce99b7ce40a2ee73cb97d57941e
SHA512 10ffbe4054a0cf2b51442daf023649ee47858a5dca0b116b6b999635feb1b83d4428fdd2bf6a3b36d7fd5ec2005e1a4d7a4263715a344b9d1293b3fcf73cd7af
SSDEEP 24576:FjY+lg48SlJPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPH:gHSl
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
Creates new service(s) 1 TTPs
persistence

Windows Service
T1543.003

Modifies Windows Firewall 2 TTPs 1 IoCs

evasion

Windows Service

T1543.003

Disable or Modify System Firewall

T1562.004

pid	Process
4860	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\zzyjodsu\ImagePath = "C:\\Windows\\SysWOW64\\zzyjodsu\\txeocpxn.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-1-5-21-566096764-1992588923-1249862864-1000\Control Panel\International\Geo\Nation	dd2449cc99a8ebb87ee86c1500f97a41.exe

Deletes itself 1 IoCs

pid	Process
1940	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
1340	txeocpxn.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1340 set thread context of 1940	1340	txeocpxn.exe	113

Launches sc.exe 3 IoCs

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

pid	Process
1364	sc.exe
1368	sc.exe
1888	sc.exe

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

System Information Discovery
T1082

Program crash 2 IoCs

pid	pid_target	Process	procid_target
4624	2076	WerFault.exe	90
3228	1340	WerFault.exe	106

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 2076 wrote to memory of 1892	2076	dd2449cc99a8ebb87ee86c1500f97a41.exe	92
PID 2076 wrote to memory of 1892	2076	dd2449cc99a8ebb87ee86c1500f97a41.exe	92
PID 2076 wrote to memory of 1892	2076	dd2449cc99a8ebb87ee86c1500f97a41.exe	92
PID 2076 wrote to memory of 3352	2076	dd2449cc99a8ebb87ee86c1500f97a41.exe	96
PID 2076 wrote to memory of 3352	2076	dd2449cc99a8ebb87ee86c1500f97a41.exe	96
PID 2076 wrote to memory of 3352	2076	dd2449cc99a8ebb87ee86c1500f97a41.exe	96
PID 2076 wrote to memory of 1364	2076	dd2449cc99a8ebb87ee86c1500f97a41.exe	98
PID 2076 wrote to memory of 1364	2076	dd2449cc99a8ebb87ee86c1500f97a41.exe	98
PID 2076 wrote to memory of 1364	2076	dd2449cc99a8ebb87ee86c1500f97a41.exe	98
PID 2076 wrote to memory of 1368	2076	dd2449cc99a8ebb87ee86c1500f97a41.exe	102
PID 2076 wrote to memory of 1368	2076	dd2449cc99a8ebb87ee86c1500f97a41.exe	102
PID 2076 wrote to memory of 1368	2076	dd2449cc99a8ebb87ee86c1500f97a41.exe	102
PID 2076 wrote to memory of 1888	2076	dd2449cc99a8ebb87ee86c1500f97a41.exe	104
PID 2076 wrote to memory of 1888	2076	dd2449cc99a8ebb87ee86c1500f97a41.exe	104
PID 2076 wrote to memory of 1888	2076	dd2449cc99a8ebb87ee86c1500f97a41.exe	104
PID 2076 wrote to memory of 4860	2076	dd2449cc99a8ebb87ee86c1500f97a41.exe	107
PID 2076 wrote to memory of 4860	2076	dd2449cc99a8ebb87ee86c1500f97a41.exe	107
PID 2076 wrote to memory of 4860	2076	dd2449cc99a8ebb87ee86c1500f97a41.exe	107
PID 1340 wrote to memory of 1940	1340	txeocpxn.exe	113
PID 1340 wrote to memory of 1940	1340	txeocpxn.exe	113
PID 1340 wrote to memory of 1940	1340	txeocpxn.exe	113
PID 1340 wrote to memory of 1940	1340	txeocpxn.exe	113
PID 1340 wrote to memory of 1940	1340	txeocpxn.exe	113

C:\Users\Admin\AppData\Local\Temp\dd2449cc99a8ebb87ee86c1500f97a41.exe
"C:\Users\Admin\AppData\Local\Temp\dd2449cc99a8ebb87ee86c1500f97a41.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2076
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\zzyjodsu\
  2⤵
  PID:1892
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\txeocpxn.exe" C:\Windows\SysWOW64\zzyjodsu\
  2⤵
  PID:3352
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create zzyjodsu binPath= "C:\Windows\SysWOW64\zzyjodsu\txeocpxn.exe /d\"C:\Users\Admin\AppData\Local\Temp\dd2449cc99a8ebb87ee86c1500f97a41.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:1364
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description zzyjodsu "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:1368
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start zzyjodsu
  2⤵
  - Launches sc.exe
  PID:1888
- 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:4860
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2076 -s 1296
  2⤵
  - Program crash
  PID:4624

C:\Windows\SysWOW64\zzyjodsu\txeocpxn.exe
C:\Windows\SysWOW64\zzyjodsu\txeocpxn.exe /d"C:\Users\Admin\AppData\Local\Temp\dd2449cc99a8ebb87ee86c1500f97a41.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1340
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  PID:1940
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1340 -s 508
  2⤵
  - Program crash
  PID:3228

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2076 -ip 2076
1⤵
PID:4904

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 1340 -ip 1340
1⤵
PID:3784

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 System Firewall

T1562.004

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

txeocpxn.exe

Path C:\Users\Admin\AppData\Local\Temp\txeocpxn.exe
Size 11.9MB
SHA256 52bd52bf5b27469e42400dff76a7ce9d39e001c9f0245f65634385841bb848cb
MD5 4034bee08f1a6a97a9a24ee7d5c40b1b
SHA1 ae9a128065a69f7c0c497fc4fd051197b03db721
SHA512 31898f49cb2f3c680417ec05f36dc1a6d73dc63bf579e7fad09172e513805933cc4370a0fefac8922a63d9b0b6582b8c4f7324bc0e896996b2a237e1f7b81e22
SSDEEP 24576:VjY+lg48SlJPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPX:QHSl
MD5 SHA1 SHA512 SSDEEP

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memory/1340-12-0x0000000000400000-0x00000000008E9000-memory.dmp

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memory/1340-10-0x0000000000C20000-0x0000000000D20000-memory.dmp

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memory/1340-18-0x0000000000400000-0x00000000008E9000-memory.dmp

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memory/1940-11-0x0000000000AF0000-0x0000000000B05000-memory.dmp

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memory/1940-15-0x0000000000AF0000-0x0000000000B05000-memory.dmp

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memory/1940-16-0x0000000000AF0000-0x0000000000B05000-memory.dmp

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memory/1940-17-0x0000000000AF0000-0x0000000000B05000-memory.dmp

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memory/1940-19-0x0000000000AF0000-0x0000000000B05000-memory.dmp

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memory/2076-4-0x0000000000400000-0x00000000008E9000-memory.dmp

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memory/2076-2-0x0000000000A40000-0x0000000000A53000-memory.dmp

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memory/2076-7-0x0000000000400000-0x00000000008E9000-memory.dmp

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memory/2076-8-0x0000000000A40000-0x0000000000A53000-memory.dmp

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memory/2076-1-0x0000000000AC0000-0x0000000000BC0000-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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