fa47d6d85592087d1cba503253670920ac9545deb3176006fc79606b21ae966c | Triage

Analysis

max time kernel
149s
max time network
153s
platform
windows10-1703_x64
resource
win10-20240404-en
resource tags

arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-x64system
submitted
21/08/2024, 13:45

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General

Target

Svhost.exe
Size

399KB
MD5

7d4970831fafb993a4b0de345cb6832b
SHA1

ff95a1c11fe502a396f65cb817abf6796dfb791a
SHA256

fa47d6d85592087d1cba503253670920ac9545deb3176006fc79606b21ae966c
SHA512

9b27ecaca0dc6b7b68acdcfc4308f213b94ddfea3cbc357ee96e1cc82bd2e3cfb06c4c8a9ce5647fbde18931f5e2b34e5a119295c4548d719b7a85d425657b84
SSDEEP

6144:PaSpJQYtBJ5666+e6VlWT8b9L+s82y00ZFlTzubWKrhtwwD:PPph95o+PVle8Is8LZFFCrhtw4

Score

10^/10

persistence privilege_escalation

Malware Config

Signatures

Modifies WinLogon for persistence 2 TTPs 2 IoCs

Winlogon Helper DLL

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\Windows\\System32\\userinit.exe,C:\\Users\\Admin\\AppData\\Roaming\\xdwdAvast Antivirus Upgrade.exe"	Svhost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\Windows\\System32\\userinit.exe"	Svhost.exe

Event Triggered Execution: AppInit DLLs 1 TTPs
Adversaries may establish persistence and/or elevate privileges by executing malicious content triggered by AppInit DLLs loaded into processes.
persistence privilege_escalation

AppInit DLLs
T1546.010

Adds Run key to start application 2 TTPs 1 IoCs

Registry Run Keys / Startup Folder

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-4106386276-4127174233-3637007343-1000\Software\Microsoft\Windows\CurrentVersion\Run\xdwdfghfghfg = "C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Windows\\Templates\\xdwdMicrosoft Dynamics Upgrade.exe"	Svhost.exe

Drops file in Windows directory 1 IoCs

description	ioc	Process
File created	C:\Windows\xdwd.dll	Svhost.exe

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

System Information Discovery
T1082

Delays execution with timeout.exe 1 IoCs

pid	Process
1792	timeout.exe

Kills process with taskkill 1 IoCs

pid	Process
3260	taskkill.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

pid	Process
4180	schtasks.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
4848	WmiApSrv.exe
4848	WmiApSrv.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe
2824	Svhost.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2824	Svhost.exe
Token: SeDebugPrivilege	3260	taskkill.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 2824 wrote to memory of 3444	2824	Svhost.exe	75
PID 2824 wrote to memory of 3444	2824	Svhost.exe	75
PID 3444 wrote to memory of 4180	3444	CMD.exe	77
PID 3444 wrote to memory of 4180	3444	CMD.exe	77
PID 2824 wrote to memory of 5076	2824	Svhost.exe	79
PID 2824 wrote to memory of 5076	2824	Svhost.exe	79
PID 2824 wrote to memory of 1296	2824	Svhost.exe	81
PID 2824 wrote to memory of 1296	2824	Svhost.exe	81
PID 1296 wrote to memory of 3260	1296	CMD.exe	83
PID 1296 wrote to memory of 3260	1296	CMD.exe	83
PID 5076 wrote to memory of 4980	5076	cmd.exe	84
PID 5076 wrote to memory of 4980	5076	cmd.exe	84
PID 2824 wrote to memory of 3644	2824	Svhost.exe	85
PID 2824 wrote to memory of 3644	2824	Svhost.exe	85
PID 3644 wrote to memory of 1792	3644	cmd.exe	87
PID 3644 wrote to memory of 1792	3644	cmd.exe	87

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\Svhost.exe
"C:\Users\Admin\AppData\Local\Temp\Svhost.exe"
1⤵
- Modifies WinLogon for persistence
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2824
- C:\Windows\SYSTEM32\CMD.exe
  "CMD" /C SchTaSKs /CrEAte /F /sc OnLoGoN /rl HighEst /tn "svchost.exe" /tr "C:\Users\Admin\AppData\Roaming\xdwdAvast Antivirus Upgrade.exe" & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3444
- - C:\Windows\system32\schtasks.exe
    SchTaSKs /CrEAte /F /sc OnLoGoN /rl HighEst /tn "svchost.exe" /tr "C:\Users\Admin\AppData\Roaming\xdwdAvast Antivirus Upgrade.exe"
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4180
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtASks /deLeTe /F /Tn "svchost.exe" & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:5076
- - C:\Windows\system32\schtasks.exe
    schtASks /deLeTe /F /Tn "svchost.exe"
    3⤵
    PID:4980
- C:\Windows\SYSTEM32\CMD.exe
  "CMD" /C taskkill /im explorer.exe /f
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1296
- - C:\Windows\system32\taskkill.exe
    taskkill /im explorer.exe /f
    3⤵
    - Kills process with taskkill
    - Suspicious use of AdjustPrivilegeToken
    PID:3260
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp9BD9.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3644
- - C:\Windows\system32\timeout.exe
    timeout 5
    3⤵
    - Delays execution with timeout.exe
    PID:1792

C:\Windows\system32\wbem\WmiApSrv.exe
C:\Windows\system32\wbem\WmiApSrv.exe
1⤵
- Suspicious behavior: EnumeratesProcesses
PID:4848

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

Scheduled Task

Persistence

Boot or Logon Autostart Execution

Registry Run Keys / Startup Folder

Winlogon Helper DLL

Event Triggered Execution

AppInit DLLs

Scheduled Task/Job

Scheduled Task

Privilege Escalation

Boot or Logon Autostart Execution

Registry Run Keys / Startup Folder

Winlogon Helper DLL

Event Triggered Execution

AppInit DLLs

Scheduled Task/Job

Scheduled Task

Defense Evasion

Modify Registry

Credential Access

Discovery

Query Registry

System Information Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp9BD9.tmp.bat

Filesize
262B

MD5
729324bab31d55db11306fdd91643e25

SHA1
20ffc24b2edda91e9334823184edaa045619ae9e

SHA256
e8bafe2040195eae8f9d886f02c4ddf5e94d9958e86af86580081be39d86c51e

SHA512
1af7006dbda7bd8affa360761d3a4d5975444ac5d83c43e9469a746b98e7a91b4420c5ac15c2c5a70e9951babb7986602595502bcbec93ece50596120db14c25

Download Submit
C:\Windows\xdwd.dll

Filesize
136KB

MD5
16e5a492c9c6ae34c59683be9c51fa31

SHA1
97031b41f5c56f371c28ae0d62a2df7d585adaba

SHA256
35c8d022e1d917f1aabdceae98097ccc072161b302f84c768ca63e4b32ac2b66

SHA512
20fd369172ef5e3e2fde388666b42e8fe5f0c2bfa338c0345f45e98af6561a249ba3ecc48c3f16efcc73f02ecb67b3ddb1e2e8f0e77d18fa00ac34e6379e50b6

Download Submit
memory/2824-119-0x00007FFA5EE10000-0x00007FFA5F7FC000-memory.dmp

Filesize
9.9MB

Download
memory/2824-1-0x0000000000F50000-0x0000000000FB8000-memory.dmp

Filesize
416KB

Download
memory/2824-2-0x00007FFA5EE13000-0x00007FFA5EE14000-memory.dmp

Filesize
4KB

Download
memory/2824-39-0x00007FFA5EE10000-0x00007FFA5F7FC000-memory.dmp

Filesize
9.9MB

Download
memory/2824-1131-0x00007FFA5EE10000-0x00007FFA5F7FC000-memory.dmp

Filesize
9.9MB

Download
memory/2824-0-0x00007FFA5EE13000-0x00007FFA5EE14000-memory.dmp

Filesize
4KB

Download
memory/4848-62-0x00007FFA6A855000-0x00007FFA6A856000-memory.dmp

Filesize
4KB

Download
memory/4848-65-0x00007FFA5B090000-0x00007FFA5B0B2000-memory.dmp

Filesize
136KB

Download
memory/4848-66-0x00007FFA6A7B0000-0x00007FFA6A98B000-memory.dmp

Filesize
1.9MB

Download
memory/4848-64-0x00007FFA6A7B0000-0x00007FFA6A98B000-memory.dmp

Filesize
1.9MB

Download
memory/4848-63-0x00007FFA6A7B0000-0x00007FFA6A98B000-memory.dmp

Filesize
1.9MB

Download