asyncrat | e51eb91ddc758c9b2d1abef31a298307a462ab48d3a2d6bae58190c53085ba84

General

Target

a3436e7f17a93b12a60029992f728720N.exe
Size

267KB
MD5

a3436e7f17a93b12a60029992f728720
SHA1

52f184dcf5d04e7c7b5d9bab7ce1a90aab626d3b
SHA256

e51eb91ddc758c9b2d1abef31a298307a462ab48d3a2d6bae58190c53085ba84
SHA512

97950ace681672548c2cc410729d282c1b6ab2e2aa39f74dbfab62c723aab3dd7ad3baa11099b094e2b61d020554fcc710c1bbbb3de7c35fc75d359b3c4b9f4c
SSDEEP

3072:WdvzDqxs8ORikgogWfiuRXd3YmSffdTKXNXANewGBvskX1pWA/B:WFzDqa86hV6uRRqX1evPlwAJ

Score

10^/10

asyncrat discovery persistence rat

Malware Config

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat

Contains code to disable Windows Defender 1 IoCs

A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.

resource	yara_rule
behavioral2/memory/1740-28-0x0000000000400000-0x0000000000430000-memory.dmp	disable_win_def

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-1-5-21-2718105630-359604950-2820636825-1000\Control Panel\International\Geo\Nation	a3436e7f17a93b12a60029992f728720N.exe

Executes dropped EXE 1 IoCs

pid	Process
3692	HiPatchService.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2718105630-359604950-2820636825-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\HiPatch = "C:\\Users\\Admin\\AppData\\Roaming\\HiPatch\\HiPatchService.exe"	a3436e7f17a93b12a60029992f728720N.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3692 set thread context of 1740	3692	HiPatchService.exe	91

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 5 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	RegAsm.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	a3436e7f17a93b12a60029992f728720N.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	HiPatchService.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe

Checks processor information in registry 2 TTPs 2 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	RegAsm.exe
Key opened	\Registry\Machine\HARDWARE\DESCRIPTION\System\CentralProcessor\0	RegAsm.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
3780	timeout.exe

Suspicious behavior: EnumeratesProcesses 28 IoCs

pid	Process
3692	HiPatchService.exe
3692	HiPatchService.exe
1740	RegAsm.exe
1740	RegAsm.exe
1740	RegAsm.exe
1740	RegAsm.exe
1740	RegAsm.exe
1740	RegAsm.exe
1740	RegAsm.exe
1740	RegAsm.exe
1740	RegAsm.exe
1740	RegAsm.exe
1740	RegAsm.exe
1740	RegAsm.exe
1740	RegAsm.exe
1740	RegAsm.exe
1740	RegAsm.exe
1740	RegAsm.exe
1740	RegAsm.exe
1740	RegAsm.exe
1740	RegAsm.exe
1740	RegAsm.exe
1740	RegAsm.exe
1740	RegAsm.exe
1740	RegAsm.exe
1740	RegAsm.exe
1740	RegAsm.exe
1740	RegAsm.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3692	HiPatchService.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 3740 wrote to memory of 3692	3740	a3436e7f17a93b12a60029992f728720N.exe	86
PID 3740 wrote to memory of 3692	3740	a3436e7f17a93b12a60029992f728720N.exe	86
PID 3740 wrote to memory of 3692	3740	a3436e7f17a93b12a60029992f728720N.exe	86
PID 3740 wrote to memory of 2528	3740	a3436e7f17a93b12a60029992f728720N.exe	87
PID 3740 wrote to memory of 2528	3740	a3436e7f17a93b12a60029992f728720N.exe	87
PID 3740 wrote to memory of 2528	3740	a3436e7f17a93b12a60029992f728720N.exe	87
PID 2528 wrote to memory of 3780	2528	cmd.exe	89
PID 2528 wrote to memory of 3780	2528	cmd.exe	89
PID 2528 wrote to memory of 3780	2528	cmd.exe	89
PID 3692 wrote to memory of 2616	3692	HiPatchService.exe	90
PID 3692 wrote to memory of 2616	3692	HiPatchService.exe	90
PID 3692 wrote to memory of 2616	3692	HiPatchService.exe	90
PID 3692 wrote to memory of 1740	3692	HiPatchService.exe	91
PID 3692 wrote to memory of 1740	3692	HiPatchService.exe	91
PID 3692 wrote to memory of 1740	3692	HiPatchService.exe	91
PID 3692 wrote to memory of 1740	3692	HiPatchService.exe	91
PID 3692 wrote to memory of 1740	3692	HiPatchService.exe	91
PID 3692 wrote to memory of 1740	3692	HiPatchService.exe	91
PID 3692 wrote to memory of 1740	3692	HiPatchService.exe	91
PID 3692 wrote to memory of 1740	3692	HiPatchService.exe	91

C:\Users\Admin\AppData\Local\Temp\a3436e7f17a93b12a60029992f728720N.exe
"C:\Users\Admin\AppData\Local\Temp\a3436e7f17a93b12a60029992f728720N.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3740
- C:\Users\Admin\AppData\Roaming\HiPatch\HiPatchService.exe
  "C:\Users\Admin\AppData\Roaming\HiPatch\HiPatchService.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3692
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
    3⤵
    PID:2616
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    - Checks processor information in registry
    - Suspicious behavior: EnumeratesProcesses
    PID:1740
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\HiPatch\HiPatchService.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2528
- - C:\Windows\SysWOW64\timeout.exe
    timeout /t 180
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:3780

C:\Windows\system32\wbem\WmiApSrv.exe
C:\Windows\system32\wbem\WmiApSrv.exe
1⤵
PID:1684

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

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

3

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\HiPatch\HiPatchService.bat

Filesize
213B

MD5
0955cb4b691d44b37f8b6fad48a33b8e

SHA1
9dae759ae014cc124ab6eed7c8035788c124ae4a

SHA256
9092dbb1ca1767d1966b7f79349dd95a802a68248251bf070c0f1d74d5681d71

SHA512
08b868a028c1e8d29ed643416850df16f58d44668f9193b46bd3934965e5617a0a4015fc52815c5456023dbde01023450d295b76d936a936f26b602e764b0235

Download Submit
C:\Users\Admin\AppData\Roaming\HiPatch\HiPatchService.exe

Filesize
267KB

MD5
a680543083fd89e7163468b4b2353b70

SHA1
551b4efeb642b6fbe8baaa8fb0d3a4ff73372abb

SHA256
32093a9912ba3fce24c4a61dd57e067c542c8035594cdd9ae169d65123fb026c

SHA512
76e95749b4dece19c0878fffd790ddaf358d9ad6971514d83c35d66b442f198e0e32e9e984a6d3daff19531f789937af06b197bbfe9bbe474409bbf9ce7941f4

Download Submit
memory/1740-28-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download
memory/3692-30-0x00000000749B0000-0x0000000075160000-memory.dmp

Filesize
7.7MB

Download
memory/3692-27-0x00000000749B0000-0x0000000075160000-memory.dmp

Filesize
7.7MB

Download
memory/3692-24-0x00000000749B0000-0x0000000075160000-memory.dmp

Filesize
7.7MB

Download
memory/3740-6-0x0000000005220000-0x000000000522A000-memory.dmp

Filesize
40KB

Download
memory/3740-0-0x00000000749BE000-0x00000000749BF000-memory.dmp

Filesize
4KB

Download
memory/3740-4-0x0000000005230000-0x000000000523A000-memory.dmp

Filesize
40KB

Download
memory/3740-25-0x00000000749B0000-0x0000000075160000-memory.dmp

Filesize
7.7MB

Download
memory/3740-5-0x00000000749B0000-0x0000000075160000-memory.dmp

Filesize
7.7MB

Download
memory/3740-3-0x0000000005160000-0x00000000051F2000-memory.dmp

Filesize
584KB

Download
memory/3740-2-0x0000000005710000-0x0000000005CB4000-memory.dmp

Filesize
5.6MB

Download
memory/3740-1-0x0000000000650000-0x0000000000696000-memory.dmp

Filesize
280KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads