asyncrat | a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e

Analysis

max time kernel
148s
max time network
148s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260709-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
04/08/2026, 07:37

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General

Target
a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe
Size 45KB
Sample260804-jf2fdsthlf
SHA256 a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e
MD5 2d2f5edee0be3d4f4d479978d594383d
SHA1 88b19a7c8a101133ab9826473676fc2ca1e11741
SHA512 a08523ad5049c8737f13a762b3db8872ca06e70884522f7da966003034f9a66f16597faaa85005cde98568d38aa1c62a0090f28cc91d8883b54ac18518540a62
SSDEEP 768:wuZ8pT1Uu4/cWUeT66mo2q1UQ0D3+/vPPjZPI7zjbTOgp3ishC53Ce+14RBDZMx:wuZ8pT1tc2rP32/jW73bTxpSA++YdMx
TLSH
T1C7233B003BE9812BF2BE4F74A8F26245867AF6732603D5491CC451DB5723FC69A42AFD
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

default command_and_control defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

phimvkl.com:80
phimvkl.com:22
phimvkl.com:8080
phimvkl.com:8880
phimvkl.com:2052
phimvkl.com:2082
phimvkl.com:2086
phimvkl.com:2095
phimvkl.com:443
phimvkl.com:2053
phimvkl.com:2083
phimvkl.com:2087
phimvkl.com:2096
phimvkl.com:8443
www.phimvkl.com:80
www.phimvkl.com:22
www.phimvkl.com:8080
www.phimvkl.com:8880
www.phimvkl.com:2052
www.phimvkl.com:2082
www.phimvkl.com:2086
www.phimvkl.com:2095
www.phimvkl.com:443
www.phimvkl.com:2053
www.phimvkl.com:2083
www.phimvkl.com:2087
www.phimvkl.com:2096
www.phimvkl.com:8443
hacker.phimvkl.com:80
hacker.phimvkl.com:22
hacker.phimvkl.com:8080
hacker.phimvkl.com:8880
hacker.phimvkl.com:2052
hacker.phimvkl.com:2082
hacker.phimvkl.com:2086
hacker.phimvkl.com:2095
hacker.phimvkl.com:443
hacker.phimvkl.com:2053
hacker.phimvkl.com:2083
hacker.phimvkl.com:2087
hacker.phimvkl.com:2096
hacker.phimvkl.com:8443
cryptolocker.phimvkl.com:80
cryptolocker.phimvkl.com:22
cryptolocker.phimvkl.com:8080
cryptolocker.phimvkl.com:8880
cryptolocker.phimvkl.com:2052
cryptolocker.phimvkl.com:2082
cryptolocker.phimvkl.com:2086
cryptolocker.phimvkl.com:2095
cryptolocker.phimvkl.com:443
cryptolocker.phimvkl.com:2053
cryptolocker.phimvkl.com:2083
cryptolocker.phimvkl.com:2087
cryptolocker.phimvkl.com:2096
cryptolocker.phimvkl.com:8443

Mutex

eKAFHLYOFL6k

Attributes

delay
0
install
true
install_file
byxm.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/0x0009000000016bc9-10.dat	family_asyncrat

Executes dropped EXE 2 IoCs

pid	Process
4124	byxm.exe
1152	byxm.exe

Outbound SSH connection to public host 2 TTPs 3 IoCs

SSH is used for remote access. This may indicate SSH host discovery, encrypted C2 traffic, or data exfiltration.

command_and_control

Protocol Tunneling

T1572

Network Service Discovery

T1046

description	flow	ioc
SSH destination	9	172.67.69.53:22
SSH destination	10	104.26.8.243:22
SSH destination	12	104.26.9.243:22

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
4948	cmd.exe
1248	cmd.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	byxm.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	byxm.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.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

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
6052	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
3152	schtasks.exe

Suspicious behavior: EnumeratesProcesses 31 IoCs

pid	Process
4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe
4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe
4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe
4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe
4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe
4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe
4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe
4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe
4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe
4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe
4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe
4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe
4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe
4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe
4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe
4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe
4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe
4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe
4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe
4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe
4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe
4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe
4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe
4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe
4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe
4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe
4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe
4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe
4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe
4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe
4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe
Token: SeDebugPrivilege	4124	byxm.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4760 wrote to memory of 4948	4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe	89
PID 4760 wrote to memory of 1248	4760	a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe	91
PID 4948 wrote to memory of 3152	4948	cmd.exe	93
PID 1248 wrote to memory of 6052	1248	cmd.exe	94
PID 1248 wrote to memory of 1152	1248	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe
"C:\Users\Admin\AppData\Local\Temp\a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4760
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "byxm" /tr '"C:\Users\Admin\AppData\Roaming\byxm.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4948
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "byxm" /tr '"C:\Users\Admin\AppData\Roaming\byxm.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:3152
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpBB57.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1248
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:6052
- - C:\Users\Admin\AppData\Roaming\byxm.exe
    "C:\Users\Admin\AppData\Roaming\byxm.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:1152

C:\Users\Admin\AppData\Roaming\byxm.exe
"C:\Users\Admin\AppData\Roaming\byxm.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:4124

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:5268

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

Network Service Discovery

T1046

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Protocol Tunneling

T1572

Exfiltration

Impact

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Downloads

tmpBB57.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmpBB57.tmp.bat
Size 148B
SHA256 ae119b9b2856228241eb632c486abc1c4822016311e87fc922808286f4a8b129
MD5 3a4341a32eb252a4b141ac570db9ac75
SHA1 a2184ae6ca40f2ee5bf3ce6e0579d33cd52bb454
SHA512 69c4f3fd7458465f704cff51d8b0e0615b4c4c47cb36d8cba155b6cb2949b6cb603339b2f98f82cfa13735a64586592e11e0fa5bb2cb4c61fcbd20eef081bc5c
TLSH
T149C02B4365C5EE0F7C05541303FAD59EE5726C1A3F44BB00C704800E228045DF0DD343
MD5 SHA1 SHA512 TLSH

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byxm.exe

Path C:\Users\Admin\AppData\Roaming\byxm.exe
Size 45KB
SHA256 a90f66d9903e7e65b307cc7d93cdfceb394774d89db3b8fe41b846a8d42ef76e
MD5 2d2f5edee0be3d4f4d479978d594383d
SHA1 88b19a7c8a101133ab9826473676fc2ca1e11741
SHA512 a08523ad5049c8737f13a762b3db8872ca06e70884522f7da966003034f9a66f16597faaa85005cde98568d38aa1c62a0090f28cc91d8883b54ac18518540a62
SSDEEP 768:wuZ8pT1Uu4/cWUeT66mo2q1UQ0D3+/vPPjZPI7zjbTOgp3ishC53Ce+14RBDZMx:wuZ8pT1tc2rP32/jW73bTxpSA++YdMx
TLSH
T1C7233B003BE9812BF2BE4F74A8F26245867AF6732603D5491CC451DB5723FC69A42AFD
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/4124-12-0x0000000074270000-0x0000000074A2C000-memory.dmp

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memory/4124-14-0x0000000074270000-0x0000000074A2C000-memory.dmp

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memory/4760-0-0x0000000074282000-0x0000000074283000-memory.dmp

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memory/4760-1-0x00000000008B0000-0x00000000008C2000-memory.dmp

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memory/4760-2-0x0000000074270000-0x0000000074A2C000-memory.dmp

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memory/4760-3-0x0000000005260000-0x00000000052FC000-memory.dmp

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memory/4760-9-0x0000000074270000-0x0000000074A2C000-memory.dmp

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