tofsee | d249a482a32a8ec7fcd413b4788623427381bfa1eda1d9830a81d0d32a253fac

Resubmissions

24/10/2023, 07:41

231024-jh9vjsbe21 10

24/10/2023, 04:50

231024-ff96raaf5s 10

Analysis

max time kernel
597s
max time network
601s
platform
windows7_x64
resource
win7-20231023-en
resource tags

arch:x64arch:x86image:win7-20231023-enlocale:en-usos:windows7-x64system
submitted
24/10/2023, 07:41

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General

Target

file.exe
Size

175KB
MD5

d382d253438178a44d67bcbaa981ef3b
SHA1

0e1c782df01cef179ac0f189689e061bb987bdc0
SHA256

d249a482a32a8ec7fcd413b4788623427381bfa1eda1d9830a81d0d32a253fac
SHA512

2949e7be5b683c875dadc838505f6265c93bc4fb37fee1d62bb1f663634671aabdf820d8cf85ed90e760f617cbe0bad9a5455e2bb4468daf5c0f5db36073a207
SSDEEP

3072:9uBNaqoS6nDTU1EKmqGlKyKwFkDtwkTGvX4IbDphSxRr79pq:kEql6nDTU1EKRGlKyJAG/zXphSH7

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

vanaheim.cn

jotunheim.name

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\yabtkign = "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
2532	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\yabtkign\ImagePath = "C:\\Windows\\SysWOW64\\yabtkign\\fzzrueiu.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
2528	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
2656	fzzrueiu.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2656 set thread context of 2528	2656	fzzrueiu.exe	41

Launches sc.exe 3 IoCs

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

pid	Process
2764	sc.exe
2816	sc.exe
2980	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 1404 wrote to memory of 2952	1404	file.exe	28
PID 1404 wrote to memory of 2952	1404	file.exe	28
PID 1404 wrote to memory of 2952	1404	file.exe	28
PID 1404 wrote to memory of 2952	1404	file.exe	28
PID 1404 wrote to memory of 2716	1404	file.exe	30
PID 1404 wrote to memory of 2716	1404	file.exe	30
PID 1404 wrote to memory of 2716	1404	file.exe	30
PID 1404 wrote to memory of 2716	1404	file.exe	30
PID 1404 wrote to memory of 2764	1404	file.exe	32
PID 1404 wrote to memory of 2764	1404	file.exe	32
PID 1404 wrote to memory of 2764	1404	file.exe	32
PID 1404 wrote to memory of 2764	1404	file.exe	32
PID 1404 wrote to memory of 2816	1404	file.exe	34
PID 1404 wrote to memory of 2816	1404	file.exe	34
PID 1404 wrote to memory of 2816	1404	file.exe	34
PID 1404 wrote to memory of 2816	1404	file.exe	34
PID 1404 wrote to memory of 2980	1404	file.exe	36
PID 1404 wrote to memory of 2980	1404	file.exe	36
PID 1404 wrote to memory of 2980	1404	file.exe	36
PID 1404 wrote to memory of 2980	1404	file.exe	36
PID 1404 wrote to memory of 2532	1404	file.exe	40
PID 1404 wrote to memory of 2532	1404	file.exe	40
PID 1404 wrote to memory of 2532	1404	file.exe	40
PID 1404 wrote to memory of 2532	1404	file.exe	40
PID 2656 wrote to memory of 2528	2656	fzzrueiu.exe	41
PID 2656 wrote to memory of 2528	2656	fzzrueiu.exe	41
PID 2656 wrote to memory of 2528	2656	fzzrueiu.exe	41
PID 2656 wrote to memory of 2528	2656	fzzrueiu.exe	41
PID 2656 wrote to memory of 2528	2656	fzzrueiu.exe	41
PID 2656 wrote to memory of 2528	2656	fzzrueiu.exe	41

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1404
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yabtkign\
  2⤵
  PID:2952
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\fzzrueiu.exe" C:\Windows\SysWOW64\yabtkign\
  2⤵
  PID:2716
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create yabtkign binPath= "C:\Windows\SysWOW64\yabtkign\fzzrueiu.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:2764
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description yabtkign "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:2816
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start yabtkign
  2⤵
  - Launches sc.exe
  PID:2980
- 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:2532

C:\Windows\SysWOW64\yabtkign\fzzrueiu.exe
C:\Windows\SysWOW64\yabtkign\fzzrueiu.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2656
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Windows security bypass
  - Sets service image path in registry
  - Deletes itself
  PID:2528

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

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

Filesize
10.3MB

MD5
a01f69afc89b2bb3ae3af38caca61b72

SHA1
77183c3fc10b128e59d61aee4514c3c64fa4c0ba

SHA256
b399d9b58877d113108dc2092c8de0e971ce08e7ec1c97af99d72ce4c4a547ad

SHA512
e0c7527e828bd9b33f8eaa280410e83a87c4dd92da416f178d924102ae8d27b70beee18feca9ce48a06890fc5250f0a68dbd4b2115775ce6f47cdcdcdb1251ec

Download Submit
C:\Windows\SysWOW64\yabtkign\fzzrueiu.exe

Filesize
10.3MB

MD5
a01f69afc89b2bb3ae3af38caca61b72

SHA1
77183c3fc10b128e59d61aee4514c3c64fa4c0ba

SHA256
b399d9b58877d113108dc2092c8de0e971ce08e7ec1c97af99d72ce4c4a547ad

SHA512
e0c7527e828bd9b33f8eaa280410e83a87c4dd92da416f178d924102ae8d27b70beee18feca9ce48a06890fc5250f0a68dbd4b2115775ce6f47cdcdcdb1251ec

Download Submit
memory/1404-1-0x00000000008A0000-0x00000000009A0000-memory.dmp

Filesize
1024KB

Download
memory/1404-4-0x0000000000230000-0x0000000000243000-memory.dmp

Filesize
76KB

Download
memory/1404-3-0x0000000000400000-0x00000000007B4000-memory.dmp

Filesize
3.7MB

Download
memory/1404-7-0x0000000000400000-0x00000000007B4000-memory.dmp

Filesize
3.7MB

Download
memory/2528-12-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2528-11-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2528-14-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2528-19-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2528-20-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2528-21-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2656-10-0x0000000000400000-0x00000000007B4000-memory.dmp

Filesize
3.7MB

Download
memory/2656-9-0x0000000000860000-0x0000000000960000-memory.dmp

Filesize
1024KB

Download
memory/2656-17-0x0000000000400000-0x00000000007B4000-memory.dmp

Filesize
3.7MB

Download

Resubmissions

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads