tofsee | bc933a99a23308afd8537adc4da5ccefa080eaaf26c31b1e9a804f557ba258c7

General

Target

1c0a51e46a97e39af8c7f2d756563035.exe
Size

14.8MB
MD5

1c0a51e46a97e39af8c7f2d756563035
SHA1

937759508af670d83b558012cfd57d90a7570755
SHA256

bc933a99a23308afd8537adc4da5ccefa080eaaf26c31b1e9a804f557ba258c7
SHA512

ebbb6969eb48bf2ce1eb8fa8eef358861aadf2505d45042050c27586366cd9df74323491f6966cc8d4f7a5695dd6fe8659750834479a57ec60b7a9f6a9c981ad
SSDEEP

49152:SkVuhFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFP:Sk

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

C2

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 1 TTPs 1 IoCs

evasion

Windows Service

T1543.003

pid	Process
2416	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\dxgmfkxq\ImagePath = "C:\\Windows\\SysWOW64\\dxgmfkxq\\khecozoc.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-1-5-21-2398549320-3657759451-817663969-1000\Control Panel\International\Geo\Nation	1c0a51e46a97e39af8c7f2d756563035.exe

Deletes itself 1 IoCs

pid	Process
4884	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
4948	khecozoc.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4948 set thread context of 4884	4948	khecozoc.exe	112

Launches sc.exe 3 IoCs

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

pid	Process
2012	sc.exe
2548	sc.exe
3760	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
1892	4948	WerFault.exe	107
3552	1224	WerFault.exe	89

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 1224 wrote to memory of 452	1224	1c0a51e46a97e39af8c7f2d756563035.exe	95
PID 1224 wrote to memory of 452	1224	1c0a51e46a97e39af8c7f2d756563035.exe	95
PID 1224 wrote to memory of 452	1224	1c0a51e46a97e39af8c7f2d756563035.exe	95
PID 1224 wrote to memory of 4988	1224	1c0a51e46a97e39af8c7f2d756563035.exe	97
PID 1224 wrote to memory of 4988	1224	1c0a51e46a97e39af8c7f2d756563035.exe	97
PID 1224 wrote to memory of 4988	1224	1c0a51e46a97e39af8c7f2d756563035.exe	97
PID 1224 wrote to memory of 2012	1224	1c0a51e46a97e39af8c7f2d756563035.exe	100
PID 1224 wrote to memory of 2012	1224	1c0a51e46a97e39af8c7f2d756563035.exe	100
PID 1224 wrote to memory of 2012	1224	1c0a51e46a97e39af8c7f2d756563035.exe	100
PID 1224 wrote to memory of 2548	1224	1c0a51e46a97e39af8c7f2d756563035.exe	102
PID 1224 wrote to memory of 2548	1224	1c0a51e46a97e39af8c7f2d756563035.exe	102
PID 1224 wrote to memory of 2548	1224	1c0a51e46a97e39af8c7f2d756563035.exe	102
PID 1224 wrote to memory of 3760	1224	1c0a51e46a97e39af8c7f2d756563035.exe	105
PID 1224 wrote to memory of 3760	1224	1c0a51e46a97e39af8c7f2d756563035.exe	105
PID 1224 wrote to memory of 3760	1224	1c0a51e46a97e39af8c7f2d756563035.exe	105
PID 1224 wrote to memory of 2416	1224	1c0a51e46a97e39af8c7f2d756563035.exe	109
PID 1224 wrote to memory of 2416	1224	1c0a51e46a97e39af8c7f2d756563035.exe	109
PID 1224 wrote to memory of 2416	1224	1c0a51e46a97e39af8c7f2d756563035.exe	109
PID 4948 wrote to memory of 4884	4948	khecozoc.exe	112
PID 4948 wrote to memory of 4884	4948	khecozoc.exe	112
PID 4948 wrote to memory of 4884	4948	khecozoc.exe	112
PID 4948 wrote to memory of 4884	4948	khecozoc.exe	112
PID 4948 wrote to memory of 4884	4948	khecozoc.exe	112

C:\Users\Admin\AppData\Local\Temp\1c0a51e46a97e39af8c7f2d756563035.exe
"C:\Users\Admin\AppData\Local\Temp\1c0a51e46a97e39af8c7f2d756563035.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1224
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\dxgmfkxq\
  2⤵
  PID:452
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\khecozoc.exe" C:\Windows\SysWOW64\dxgmfkxq\
  2⤵
  PID:4988
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create dxgmfkxq binPath= "C:\Windows\SysWOW64\dxgmfkxq\khecozoc.exe /d\"C:\Users\Admin\AppData\Local\Temp\1c0a51e46a97e39af8c7f2d756563035.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:2012
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description dxgmfkxq "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:2548
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start dxgmfkxq
  2⤵
  - Launches sc.exe
  PID:3760
- 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:2416
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1224 -s 1308
  2⤵
  - Program crash
  PID:3552

C:\Windows\SysWOW64\dxgmfkxq\khecozoc.exe
C:\Windows\SysWOW64\dxgmfkxq\khecozoc.exe /d"C:\Users\Admin\AppData\Local\Temp\1c0a51e46a97e39af8c7f2d756563035.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4948
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  PID:4884
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4948 -s 220
  2⤵
  - Program crash
  PID:1892

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4948 -ip 4948
1⤵
PID:1528

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 1224 -ip 1224
1⤵
PID:648

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

C:\Users\Admin\AppData\Local\Temp\khecozoc.exe

Filesize
8.4MB

MD5
4b665e63bc3f01a4167aa4aeac6f6910

SHA1
16e402b2acb49ba7199cdc86b66b55834c66395f

SHA256
d408c9e69b40dc32c244cd10493816350eebbac0d199c8cf756faac911371483

SHA512
c77e7b6043fb3882f23af9753a2acedbf07adf074ffafb87b5e1252a27516a496023ac737c9899a6cef6b998190caf1a1de3b8f8bc597f5a65c643d5ab54fd08

Download Submit
C:\Windows\SysWOW64\dxgmfkxq\khecozoc.exe

Filesize
11.8MB

MD5
e119825255e138b1fa9426876ce97c1a

SHA1
5b84e609dacadbb157215d5d0f646d15e0b6e5b4

SHA256
1563644ece51748ad4799ee1ec4762251b64ade3269a7f0aa6d6af7d82f50125

SHA512
cd0dffec02452cd4241c9192bae559bca861ccbabfb3f7f6b4924530d4674d59f6aff0befa3b4881c678e4fcd8c6c726188c95eb29bffe33807d3daaa3e57ff2

Download Submit
memory/1224-12-0x0000000000400000-0x0000000000C17000-memory.dmp

Filesize
8.1MB

Download
memory/1224-5-0x0000000000400000-0x0000000000C17000-memory.dmp

Filesize
8.1MB

Download
memory/1224-4-0x0000000000400000-0x0000000000C17000-memory.dmp

Filesize
8.1MB

Download
memory/1224-2-0x0000000002820000-0x0000000002833000-memory.dmp

Filesize
76KB

Download
memory/1224-1-0x0000000000D60000-0x0000000000E60000-memory.dmp

Filesize
1024KB

Download
memory/1224-14-0x0000000000D60000-0x0000000000E60000-memory.dmp

Filesize
1024KB

Download
memory/4884-23-0x0000000000720000-0x0000000000735000-memory.dmp

Filesize
84KB

Download
memory/4884-22-0x0000000000720000-0x0000000000735000-memory.dmp

Filesize
84KB

Download
memory/4884-18-0x0000000000720000-0x0000000000735000-memory.dmp

Filesize
84KB

Download
memory/4884-13-0x0000000000720000-0x0000000000735000-memory.dmp

Filesize
84KB

Download
memory/4884-21-0x0000000000720000-0x0000000000735000-memory.dmp

Filesize
84KB

Download
memory/4948-11-0x0000000000400000-0x0000000000C17000-memory.dmp

Filesize
8.1MB

Download
memory/4948-17-0x0000000000400000-0x0000000000C17000-memory.dmp

Filesize
8.1MB

Download
memory/4948-10-0x0000000000D70000-0x0000000000D83000-memory.dmp

Filesize
76KB

Download
memory/4948-9-0x0000000000F00000-0x0000000001000000-memory.dmp

Filesize
1024KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads