tofsee | 68d927f4a5b3d4f059795631f21d37ef2c8b7afa4b18d928b9cedf08287de3b4

Analysis

max time kernel
164s
max time network
175s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
29/12/2023, 22:51

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General

Target
06235e49b7dbd0a883f3c478dbcfa92f.exe
Size 13.5MB
Sample231229-2stv7ahedj
SHA256 68d927f4a5b3d4f059795631f21d37ef2c8b7afa4b18d928b9cedf08287de3b4
MD5 06235e49b7dbd0a883f3c478dbcfa92f
SHA1 630124861afd7ae79019fd694c73fe7347ae0bc6
SHA512 caba1e2912458f97e6c35656e9764369fb5527a7c3e468ad688fd1f30b1bdad1ac57d000c2d0215ef70a8a12cc5e8427df107428716eeb356985bd519d2598c9
SSDEEP 98304:dNWUlllllllllllllllllllllllllllllllllllllllllllllllllllllllllll9:7W
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

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
2812	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\oxcqmwtj\ImagePath = "C:\\Windows\\SysWOW64\\oxcqmwtj\\faewmxzx.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-1-5-21-3073191680-435865314-2862784915-1000\Control Panel\International\Geo\Nation	06235e49b7dbd0a883f3c478dbcfa92f.exe

Deletes itself 1 IoCs

pid	Process
4772	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
3780	faewmxzx.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3780 set thread context of 4772	3780	faewmxzx.exe	108

Launches sc.exe 3 IoCs

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

pid	Process
4184	sc.exe
4168	sc.exe
888	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 3176 wrote to memory of 2740	3176	06235e49b7dbd0a883f3c478dbcfa92f.exe	94
PID 3176 wrote to memory of 2740	3176	06235e49b7dbd0a883f3c478dbcfa92f.exe	94
PID 3176 wrote to memory of 2740	3176	06235e49b7dbd0a883f3c478dbcfa92f.exe	94
PID 3176 wrote to memory of 3216	3176	06235e49b7dbd0a883f3c478dbcfa92f.exe	96
PID 3176 wrote to memory of 3216	3176	06235e49b7dbd0a883f3c478dbcfa92f.exe	96
PID 3176 wrote to memory of 3216	3176	06235e49b7dbd0a883f3c478dbcfa92f.exe	96
PID 3176 wrote to memory of 888	3176	06235e49b7dbd0a883f3c478dbcfa92f.exe	98
PID 3176 wrote to memory of 888	3176	06235e49b7dbd0a883f3c478dbcfa92f.exe	98
PID 3176 wrote to memory of 888	3176	06235e49b7dbd0a883f3c478dbcfa92f.exe	98
PID 3176 wrote to memory of 4184	3176	06235e49b7dbd0a883f3c478dbcfa92f.exe	100
PID 3176 wrote to memory of 4184	3176	06235e49b7dbd0a883f3c478dbcfa92f.exe	100
PID 3176 wrote to memory of 4184	3176	06235e49b7dbd0a883f3c478dbcfa92f.exe	100
PID 3176 wrote to memory of 4168	3176	06235e49b7dbd0a883f3c478dbcfa92f.exe	102
PID 3176 wrote to memory of 4168	3176	06235e49b7dbd0a883f3c478dbcfa92f.exe	102
PID 3176 wrote to memory of 4168	3176	06235e49b7dbd0a883f3c478dbcfa92f.exe	102
PID 3176 wrote to memory of 2812	3176	06235e49b7dbd0a883f3c478dbcfa92f.exe	104
PID 3176 wrote to memory of 2812	3176	06235e49b7dbd0a883f3c478dbcfa92f.exe	104
PID 3176 wrote to memory of 2812	3176	06235e49b7dbd0a883f3c478dbcfa92f.exe	104
PID 3780 wrote to memory of 4772	3780	faewmxzx.exe	108
PID 3780 wrote to memory of 4772	3780	faewmxzx.exe	108
PID 3780 wrote to memory of 4772	3780	faewmxzx.exe	108
PID 3780 wrote to memory of 4772	3780	faewmxzx.exe	108
PID 3780 wrote to memory of 4772	3780	faewmxzx.exe	108

C:\Users\Admin\AppData\Local\Temp\06235e49b7dbd0a883f3c478dbcfa92f.exe
"C:\Users\Admin\AppData\Local\Temp\06235e49b7dbd0a883f3c478dbcfa92f.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3176
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\oxcqmwtj\
  2⤵
  PID:2740
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\faewmxzx.exe" C:\Windows\SysWOW64\oxcqmwtj\
  2⤵
  PID:3216
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create oxcqmwtj binPath= "C:\Windows\SysWOW64\oxcqmwtj\faewmxzx.exe /d\"C:\Users\Admin\AppData\Local\Temp\06235e49b7dbd0a883f3c478dbcfa92f.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:888
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description oxcqmwtj "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:4184
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start oxcqmwtj
  2⤵
  - Launches sc.exe
  PID:4168
- 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:2812

C:\Windows\SysWOW64\oxcqmwtj\faewmxzx.exe
C:\Windows\SysWOW64\oxcqmwtj\faewmxzx.exe /d"C:\Users\Admin\AppData\Local\Temp\06235e49b7dbd0a883f3c478dbcfa92f.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3780
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  PID:4772

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

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

faewmxzx.exe

Path C:\Users\Admin\AppData\Local\Temp\faewmxzx.exe
Size 10.7MB
SHA256 c0b03c7ed18a8c9df7473772af9df5046defa7e3bc0f33ae2df217d57320981c
MD5 fd639331d864e0d6653818e0b4f752a7
SHA1 8caf50b72ca55b4770e473ec270356af6ac8d80e
SHA512 5562fc1f1a94b6235888a0e1dcc072271474d34ddd609b81ccb1a475fa6313d0e910cadfa13e310e4eac1f7deb41abd3ceab6bf2121055f1dc219e9585ced65c
SSDEEP 98304:KNWUlllllllllllllllllllllllllllllllllllllllllllllllllllllllllllX:AW
MD5 SHA1 SHA512 SSDEEP

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faewmxzx.exe

Path C:\Windows\SysWOW64\oxcqmwtj\faewmxzx.exe
Size 512KB
SHA256 6efea653912516827b73de749af1ed1f6f70a14f7ff7ec3e7e0e7fcaf97a16a8
MD5 bae219e7b23e16b6b9d1a091b9256fbe
SHA1 1acc2e97318383f15912af9dc00b5952cccfe4b5
SHA512 f33468abbba3b4c8e3b219f0f0f3d97f71b7cfc81ebec1abc0c6c9340b2e46f54a8c3706a8ecfad366ff7b66d711226dfa489e4395ffe9cba7b8b60973ad2c17
SSDEEP 12288:tg1dZoZmeh2lllllllllllllllllllllllllll:KzZsmeUllllllllllllllllllllllllB
MD5 SHA1 SHA512 SSDEEP

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memory/3176-6-0x0000000000400000-0x00000000036CD000-memory.dmp

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memory/3176-5-0x0000000000400000-0x00000000036CD000-memory.dmp

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memory/3176-1-0x0000000003870000-0x0000000003970000-memory.dmp

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memory/3176-3-0x0000000000400000-0x00000000036CD000-memory.dmp

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memory/3176-9-0x0000000000400000-0x00000000036CD000-memory.dmp

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memory/3176-10-0x0000000005410000-0x0000000005423000-memory.dmp

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memory/3176-2-0x0000000005410000-0x0000000005423000-memory.dmp

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memory/3780-13-0x00000000036D0000-0x00000000037D0000-memory.dmp

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memory/3780-14-0x0000000000400000-0x00000000036CD000-memory.dmp

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memory/3780-16-0x0000000000400000-0x00000000036CD000-memory.dmp

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memory/4772-15-0x0000000000BA0000-0x0000000000BB5000-memory.dmp

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memory/4772-19-0x0000000000BA0000-0x0000000000BB5000-memory.dmp

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memory/4772-20-0x0000000000BA0000-0x0000000000BB5000-memory.dmp

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memory/4772-21-0x0000000000BA0000-0x0000000000BB5000-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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