asyncrat | 0c13398c86b3cbb07fd9b9eafde5849afff6b15f7905e77636d84dfa945d9485

Analysis

max time kernel
500s
max time network
505s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20241023-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
16-11-2024 20:23

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General

Target

YAAKJF.exe
Size

45KB
MD5

3c9b4e3886756c28e710d2af41de6423
SHA1

a4c1402f70953e494b66cceda691fa7ac9430a02
SHA256

0c13398c86b3cbb07fd9b9eafde5849afff6b15f7905e77636d84dfa945d9485
SHA512

82f19d64dd69bbc7145565eee747339de6d348831f01062192d214e32896772bc6ebb893774f25e086cdcf2a75be7a36e6dde256f3748eff19f085ba6836aa06
SSDEEP

768:9u50dTtQpVBTWU/fShmo2qg59dRTMKPIuljbGgX3il4gq/Ztg2hBDZXx:9u50dTt0y2FB+utbZXSaRXdXx

Score

10^/10

asyncrat default discovery ransomware rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

127.0.0.1:6606

127.0.0.1:7707

127.0.0.1:8808

127.0.0.1:4782

127.0.0.1:3425

Cristopher11sa-62565.portmap.host:6606

Cristopher11sa-62565.portmap.host:7707

Cristopher11sa-62565.portmap.host:8808

Cristopher11sa-62565.portmap.host:4782

Cristopher11sa-62565.portmap.host:3425

190.104.116.8:6606

190.104.116.8:7707

190.104.116.8:8808

190.104.116.8:4782

190.104.116.8:3425

azxq0ap.localto.net:6606

azxq0ap.localto.net:7707

azxq0ap.localto.net:8808

azxq0ap.localto.net:4782

azxq0ap.localto.net:3425

Mutex

E2qgtjRHaRSi

Attributes

delay
3
install
false
install_file
Java updater.exe
install_folder
%AppData%

aes.plain

Signatures

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

Sets desktop wallpaper using registry 2 TTPs 1 IoCs

ransomware

Defacement

T1491

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-4074627901-37362009-3519777259-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\tmpA788.tmp.png"	YAAKJF.exe

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 13 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	cvtres.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	csc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cvtres.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	csc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cvtres.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	csc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cvtres.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	csc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	csc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cvtres.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	YAAKJF.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cvtres.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	csc.exe

Modifies Control Panel 2 IoCs

evasion

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-4074627901-37362009-3519777259-1000\Control Panel\Desktop\TileWallpaper = "0"	YAAKJF.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-4074627901-37362009-3519777259-1000\Control Panel\Desktop\WallpaperStyle = "2"	YAAKJF.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
1964	YAAKJF.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1964	YAAKJF.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
1964	YAAKJF.exe

Suspicious use of WriteProcessMemory 33 IoCs

description	pid	Process	procid_target
PID 1964 wrote to memory of 3312	1964	YAAKJF.exe	90
PID 1964 wrote to memory of 3312	1964	YAAKJF.exe	90
PID 1964 wrote to memory of 3312	1964	YAAKJF.exe	90
PID 1964 wrote to memory of 5112	1964	YAAKJF.exe	93
PID 1964 wrote to memory of 5112	1964	YAAKJF.exe	93
PID 1964 wrote to memory of 5112	1964	YAAKJF.exe	93
PID 5112 wrote to memory of 4060	5112	csc.exe	95
PID 5112 wrote to memory of 4060	5112	csc.exe	95
PID 5112 wrote to memory of 4060	5112	csc.exe	95
PID 1964 wrote to memory of 1152	1964	YAAKJF.exe	96
PID 1964 wrote to memory of 1152	1964	YAAKJF.exe	96
PID 1964 wrote to memory of 1152	1964	YAAKJF.exe	96
PID 1152 wrote to memory of 3988	1152	csc.exe	98
PID 1152 wrote to memory of 3988	1152	csc.exe	98
PID 1152 wrote to memory of 3988	1152	csc.exe	98
PID 1964 wrote to memory of 4056	1964	YAAKJF.exe	99
PID 1964 wrote to memory of 4056	1964	YAAKJF.exe	99
PID 1964 wrote to memory of 4056	1964	YAAKJF.exe	99
PID 4056 wrote to memory of 3896	4056	csc.exe	101
PID 4056 wrote to memory of 3896	4056	csc.exe	101
PID 4056 wrote to memory of 3896	4056	csc.exe	101
PID 1964 wrote to memory of 1672	1964	YAAKJF.exe	102
PID 1964 wrote to memory of 1672	1964	YAAKJF.exe	102
PID 1964 wrote to memory of 1672	1964	YAAKJF.exe	102
PID 1672 wrote to memory of 3920	1672	csc.exe	104
PID 1672 wrote to memory of 3920	1672	csc.exe	104
PID 1672 wrote to memory of 3920	1672	csc.exe	104
PID 1964 wrote to memory of 4412	1964	YAAKJF.exe	105
PID 1964 wrote to memory of 4412	1964	YAAKJF.exe	105
PID 1964 wrote to memory of 4412	1964	YAAKJF.exe	105
PID 4412 wrote to memory of 632	4412	csc.exe	107
PID 4412 wrote to memory of 632	4412	csc.exe	107
PID 4412 wrote to memory of 632	4412	csc.exe	107

C:\Users\Admin\AppData\Local\Temp\YAAKJF.exe
"C:\Users\Admin\AppData\Local\Temp\YAAKJF.exe"
1⤵
- Sets desktop wallpaper using registry
- System Location Discovery: System Language Discovery
- Modifies Control Panel
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of WriteProcessMemory
PID:1964
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\Admin\AppData\Local\Temp\pbkktg0x\pbkktg0x.cmdline"
  2⤵
  - System Location Discovery: System Language Discovery
  PID:3312
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\Admin\AppData\Local\Temp\RESA204.tmp" "c:\Users\Admin\AppData\Local\Temp\pbkktg0x\CSCB6275F15FE2442BB777E1323728EAB3.TMP"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:4360
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\Admin\AppData\Local\Temp\cbhthfan\cbhthfan.cmdline"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5112
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\Admin\AppData\Local\Temp\RESA27C.tmp" "c:\Users\Admin\AppData\Local\Temp\cbhthfan\CSCA6282C0AE5F246F28F66EAD3A4D3994C.TMP"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:4060
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\Admin\AppData\Local\Temp\0brzqepz\0brzqepz.cmdline"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1152
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\Admin\AppData\Local\Temp\RESD5A2.tmp" "c:\Users\Admin\AppData\Local\Temp\0brzqepz\CSC775A337EF2824656B53FBFEC89126F46.TMP"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:3988
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\Admin\AppData\Local\Temp\slpoeeen\slpoeeen.cmdline"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4056
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\Admin\AppData\Local\Temp\RES5A62.tmp" "c:\Users\Admin\AppData\Local\Temp\slpoeeen\CSCF82E2C1A5E1043D79D667CE9F453AF7C.TMP"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:3896
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\Admin\AppData\Local\Temp\bklupjor\bklupjor.cmdline"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1672
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\Admin\AppData\Local\Temp\RES759B.tmp" "c:\Users\Admin\AppData\Local\Temp\bklupjor\CSCA5A7ED41CCEC41EAAD207C815E27C4D.TMP"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:3920
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\Admin\AppData\Local\Temp\pr5ufam1\pr5ufam1.cmdline"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4412
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\Admin\AppData\Local\Temp\RESBC97.tmp" "c:\Users\Admin\AppData\Local\Temp\pr5ufam1\CSCF30AC6F392E64FE4B16D43265F7C3FC.TMP"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:632

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact