plugx | 72a7b8fe4b8401120124e8f9460bfd457fbf76b70a0c057b58ff271c5b2aadca

Resubmissions

14/10/2024, 13:09

241014-qd9sbawhrb10

14/10/2024, 13:03

14/10/2024, 12:59

14/10/2024, 12:57

14/10/2024, 12:55

14/10/2024, 12:54

14/10/2024, 12:52

Analysis

max time kernel
39s
max time network
41s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
14/10/2024, 12:52

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General

Target
AvastSvcZEg/AvastSvc.exe
Size 60KB
Sample241014-p35dfswejd
SHA256 85ca20eeec3400c68a62639a01928a5dab824d2eadf589e5cbfe5a2bc41d9654
MD5 a72036f635cecf0dcb1e9c6f49a8fa5b
SHA1 049813b955db1dd90952657ae2bd34250153563e
SHA512 e3582e0969361d272c2469ce139ec809b9b0ac98fbc5eb5bb287442aed4c6ba69ed8175b68970751c93730cfaf07b75c3bc5e4e24aeda8f984b24f33bb8e3da2
SSDEEP 768:Q/WQ3/TymxfsHYPry0bgYh3LKgMoCDGFh9D:Q+QvT7xUHYPDbgYVLWofD
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

plugx discovery persistence trojan

Malware Config

Extracted

Family

plugx

103.56.53.46:80
103.56.53.46:110
103.56.53.46:443
103.56.53.46:5938

Attributes

folder
AvastSvcZEg

Signatures

PlugX
PlugX is a RAT (Remote Access Trojan) that has been around since 2008.
trojan plugx

Executes dropped EXE 1 IoCs

pid	Process
3456	AvastSvc.exe

Loads dropped DLL 1 IoCs

pid	Process
3456	AvastSvc.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\AvastSvcZEg = "\"C:\\ProgramData\\AvastSvcZEg\\AvastSvc.exe\" 303"	AvastSvc.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\AvastSvcZEg = "\"C:\\ProgramData\\AvastSvcZEg\\AvastSvc.exe\" 303"	AvastSvc.exe

Enumerates connected drives 3 TTPs 2 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	\??\D:	AvastSvc.exe
File opened (read-only)	\??\F:	AvastSvc.exe

System Location Discovery: System Language Discovery 1 TTPs 2 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AvastSvc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AvastSvc.exe

Modifies registry class 5 IoCs

description	ioc	Process
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Classes\ms-pu\CLSID = 39003500360036003200460044004100380044003200340030003300390032000000	AvastSvc.exe
Key created	\REGISTRY\MACHINE\Software\CLASSES\ms-pu	AvastSvc.exe
Key created	\REGISTRY\MACHINE\Software\CLASSES\ms-pu\PROXY	AvastSvc.exe
Key created	\REGISTRY\MACHINE\Software\CLASSES\ms-pu	AvastSvc.exe
Key created	\REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000_Classes\ms-pu	AvastSvc.exe

Suspicious behavior: EnumeratesProcesses 12 IoCs

pid	Process
3456	AvastSvc.exe
3456	AvastSvc.exe
3456	AvastSvc.exe
3456	AvastSvc.exe
3456	AvastSvc.exe
3456	AvastSvc.exe
3456	AvastSvc.exe
3456	AvastSvc.exe
3456	AvastSvc.exe
3456	AvastSvc.exe
3456	AvastSvc.exe
3456	AvastSvc.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	3456	AvastSvc.exe
Token: SeDebugPrivilege	3456	AvastSvc.exe
Token: SeTcbPrivilege	3456	AvastSvc.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1972 wrote to memory of 4680	1972	cmd.exe	84
PID 1972 wrote to memory of 4680	1972	cmd.exe	84
PID 1972 wrote to memory of 4680	1972	cmd.exe	84
PID 4680 wrote to memory of 3456	4680	AvastSvc.exe	85
PID 4680 wrote to memory of 3456	4680	AvastSvc.exe	85
PID 4680 wrote to memory of 3456	4680	AvastSvc.exe	85

C:\Windows\system32\cmd.exe
cmd /c C:\Users\Admin\AppData\Local\Temp\AvastSvcZEg\AvastSvc.exe
1⤵
- Suspicious use of WriteProcessMemory
PID:1972
- C:\Users\Admin\AppData\Local\Temp\AvastSvcZEg\AvastSvc.exe
  C:\Users\Admin\AppData\Local\Temp\AvastSvcZEg\AvastSvc.exe
  2⤵
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:4680
- - C:\ProgramData\AvastSvcZEg\AvastSvc.exe
    C:\ProgramData\AvastSvcZEg\AvastSvc.exe 303
    3⤵
    - Executes dropped EXE
    - Loads dropped DLL
    - Enumerates connected drives
    - System Location Discovery: System Language Discovery
    - Modifies registry class
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3456

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

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

AvastAuth.dat

Path C:\ProgramData\AvastSvcZEg\AvastAuth.dat
Size 160KB
SHA256 8ec409c1537e3030405bc8f8353d2605d1e88f1b245554383682f3aa8b5100ec
MD5 53830fe278811363f93e0906d8b5ce69
SHA1 b133578af848e10500cc8b943483ed71e86a713a
SHA512 c87497b49d2924be200053495074e16d82fdc875ecdcd231e185479901020c176c2a478c52eea55a9908fe3605ed3d5b2037fa4c83248d4d2bfea45f9f03dc37
SSDEEP 3072:4NZDIHsDYhxMxRpyfGZpUOJR6UfzhgAN6f8HQJCKJUn/:4NZQsskdEGvH4IzhgnUH+dU/
MD5 SHA1 SHA512 SSDEEP

Submit Download

AvastSvc.exe

Path C:\ProgramData\AvastSvcZEg\AvastSvc.exe
Size 60KB
SHA256 85ca20eeec3400c68a62639a01928a5dab824d2eadf589e5cbfe5a2bc41d9654
MD5 a72036f635cecf0dcb1e9c6f49a8fa5b
SHA1 049813b955db1dd90952657ae2bd34250153563e
SHA512 e3582e0969361d272c2469ce139ec809b9b0ac98fbc5eb5bb287442aed4c6ba69ed8175b68970751c93730cfaf07b75c3bc5e4e24aeda8f984b24f33bb8e3da2
SSDEEP 768:Q/WQ3/TymxfsHYPry0bgYh3LKgMoCDGFh9D:Q+QvT7xUHYPDbgYVLWofD
MD5 SHA1 SHA512 SSDEEP

Submit Download

wsc.dll

Path C:\ProgramData\AvastSvcZEg\wsc.dll
Size 52KB
SHA256 6491c646397025bf02709f1bd3025f1622abdc89b550ac38ce6fac938353b954
MD5 831252e7fa9bd6fa174715647ebce516
SHA1 bf8c5bf141f0db53000805f2629e6e031d137ceb
SHA512 0be6e898dcb75b32358bb8c2214e7b9453034ecfbe71d092df75b186a28f97ae7d5737f010b9d9e781c6b4cf3da19ee4a7cf5002604d23c527c55a3f7a0dba04
SSDEEP 768:ctRTzgT291lvLotXKUoImwKvuZ+UHo4QIkfbZoN:ctRHgTWPcpmwKf4X2oN
MD5 SHA1 SHA512 SSDEEP

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memory/3456-14-0x0000000000FE0000-0x00000000010E0000-memory.dmp

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memory/3456-13-0x00000000012A0000-0x0000000004ED7000-memory.dmp

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memory/3456-15-0x00000000012A0000-0x0000000004ED7000-memory.dmp

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memory/3456-16-0x00000000012A0000-0x0000000004ED7000-memory.dmp

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memory/3456-17-0x0000000000FE0000-0x00000000010E0000-memory.dmp

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memory/4680-1-0x0000000000A80000-0x0000000000B80000-memory.dmp

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memory/4680-2-0x0000000000D70000-0x00000000049A7000-memory.dmp

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