asyncrat | 8a9c3f8187497cdd1eb45c4718382a458934af2e08dd29547257d75cd12b924a

Analysis

max time kernel
148s
max time network
149s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260911-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260911-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
02/11/2026, 12:51

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General

Target
upgrade.exe
Size 112KB
Sample261102-p3kn2sfb62
SHA256 8a9c3f8187497cdd1eb45c4718382a458934af2e08dd29547257d75cd12b924a
MD5 e810c2d1e991cf1016e3aab47d36da2d
SHA1 a16101328fde25bffe673e8a87fabaf64c152f40
SHA512 18288ed70a6935085b05d87b17059f692ab1878eb5bcf418cd3cf7c72d2a7528ac0e010d1f7e1f78bf1c82863b510dd36e0d7d37f090b823641db99d3782536e
SSDEEP 1536:7uTO9TgQCv2IK0efbDXShyia6E4d6tKrqi35Rwa3:7uTaTg7v2r0efbDl4pPwa3
TLSH
T11CB39F30EFD7B03AED6D4AFC5CA371714925A9D3250EF57AFCC0328716226C1A5326A9
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

default defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

fulhamdrycleaners.co.uk:443
fulhamdrycleaners.co.uk:80
fulhamdrycleaners.co.uk:22
fulhamdrycleaners.co.uk:3306
fulhamdrycleaners.co.uk:21
fulhamdrycleaners.co.uk:5900
api.fulhamdrycleaners.co.uk:443
api.fulhamdrycleaners.co.uk:80
api.fulhamdrycleaners.co.uk:22
api.fulhamdrycleaners.co.uk:3306
api.fulhamdrycleaners.co.uk:21
api.fulhamdrycleaners.co.uk:5900
www.fulhamdrycleaners.co.uk:443
www.fulhamdrycleaners.co.uk:80
www.fulhamdrycleaners.co.uk:22
www.fulhamdrycleaners.co.uk:3306
www.fulhamdrycleaners.co.uk:21
www.fulhamdrycleaners.co.uk:5900

Mutex

K5NJzfq5dpiW

Attributes

delay
3
install
true
install_file
upgrade.exe
install_folder
%AppData%

aes.plain

Signatures

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

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral2/files/0x00030000000170c6-10.dat	family_asyncrat

Executes dropped EXE 2 IoCs

pid	Process
4260	upgrade.exe
2220	upgrade.exe

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

System Information Discovery
T1082

Executes a command shell one-liner 1 TTPs 2 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
6132	cmd.exe
3320	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	upgrade.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	upgrade.exe

System Location Discovery: System Language Discovery 1 TTPs 7 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	upgrade.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	upgrade.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	upgrade.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
4384	timeout.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

T1053.005

pid	Process
2256	schtasks.exe

Suspicious behavior: EnumeratesProcesses 31 IoCs

pid	Process
5136	upgrade.exe
5136	upgrade.exe
5136	upgrade.exe
5136	upgrade.exe
5136	upgrade.exe
5136	upgrade.exe
5136	upgrade.exe
5136	upgrade.exe
5136	upgrade.exe
5136	upgrade.exe
5136	upgrade.exe
5136	upgrade.exe
5136	upgrade.exe
5136	upgrade.exe
5136	upgrade.exe
5136	upgrade.exe
5136	upgrade.exe
5136	upgrade.exe
5136	upgrade.exe
5136	upgrade.exe
5136	upgrade.exe
5136	upgrade.exe
5136	upgrade.exe
5136	upgrade.exe
5136	upgrade.exe
5136	upgrade.exe
5136	upgrade.exe
5136	upgrade.exe
5136	upgrade.exe
5136	upgrade.exe
5136	upgrade.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	5136	upgrade.exe
Token: SeDebugPrivilege	4260	upgrade.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 5136 wrote to memory of 6132	5136	upgrade.exe	89
PID 5136 wrote to memory of 3320	5136	upgrade.exe	91
PID 6132 wrote to memory of 2256	6132	cmd.exe	93
PID 3320 wrote to memory of 4384	3320	cmd.exe	94
PID 3320 wrote to memory of 2220	3320	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\upgrade.exe
"C:\Users\Admin\AppData\Local\Temp\upgrade.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5136
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "upgrade" /tr '"C:\Users\Admin\AppData\Roaming\upgrade.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:6132
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "upgrade" /tr '"C:\Users\Admin\AppData\Roaming\upgrade.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2256
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp8F75.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3320
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:4384
- - C:\Users\Admin\AppData\Roaming\upgrade.exe
    "C:\Users\Admin\AppData\Roaming\upgrade.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:2220

C:\Users\Admin\AppData\Roaming\upgrade.exe
"C:\Users\Admin\AppData\Roaming\upgrade.exe"
1⤵
- Executes dropped EXE
- Reads the TCP/IP host and domain name from the registry
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:4260

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

Windows Command Shell

T1059.003

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

System Network Configuration Discovery

T1016

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

tmp8F75.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp8F75.tmp.bat
Size 151B
SHA256 79aef96a04991c36e8c13889dcc84a7f2cde3a57558f30982e086aba1763c499
MD5 cf9ae547e87fff5451783903fb2f39b9
SHA1 80dbb2444f200e8ff800e05fad1aa6609c217640
SHA512 0ba13b9b2abad24ffb0ba7b5e1e56c231ce97e8c2a95fa757f7f08cf9cc0bdf0788f152940594e9aa9956bcc81e89f3ac424ddd2a816f286e486b9f8cf4d28d8
TLSH
T10DC08C42A1C9EA0E2805642303BAA48E91B6A8A93E80BB108304408A6280488E0DB242
MD5 SHA1 SHA512 TLSH

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upgrade.exe

Path C:\Users\Admin\AppData\Roaming\upgrade.exe
Size 112KB
SHA256 8a9c3f8187497cdd1eb45c4718382a458934af2e08dd29547257d75cd12b924a
MD5 e810c2d1e991cf1016e3aab47d36da2d
SHA1 a16101328fde25bffe673e8a87fabaf64c152f40
SHA512 18288ed70a6935085b05d87b17059f692ab1878eb5bcf418cd3cf7c72d2a7528ac0e010d1f7e1f78bf1c82863b510dd36e0d7d37f090b823641db99d3782536e
SSDEEP 1536:7uTO9TgQCv2IK0efbDXShyia6E4d6tKrqi35Rwa3:7uTaTg7v2r0efbDl4pPwa3
TLSH
T11CB39F30EFD7B03AED6D4AFC5CA371714925A9D3250EF57AFCC0328716226C1A5326A9
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4260-12-0x00000000749E0000-0x000000007519C000-memory.dmp

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memory/4260-14-0x00000000749E0000-0x000000007519C000-memory.dmp

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memory/5136-0-0x0000000074A02000-0x0000000074A03000-memory.dmp

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memory/5136-1-0x0000000000330000-0x0000000000352000-memory.dmp

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memory/5136-2-0x00000000749F0000-0x00000000751AC000-memory.dmp

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memory/5136-3-0x0000000004FA0000-0x000000000503C000-memory.dmp

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memory/5136-9-0x00000000749F0000-0x00000000751AC000-memory.dmp

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