asyncrat | b4b664bcf91ad02e0e9583b80f98d7da73fd17e12ebd76a7c47fe013c9bc5b74

General

Target

4b4d72704210c1c4ed3cbd3e795446f0N.exe
Size

2.5MB
MD5

4b4d72704210c1c4ed3cbd3e795446f0
SHA1

25b1643ced521f1ac8510a214b90a5f719dee571
SHA256

b4b664bcf91ad02e0e9583b80f98d7da73fd17e12ebd76a7c47fe013c9bc5b74
SHA512

242fa5e9987886a431d43538a381c6bf448aa1aca7d778b9b0d4c1ff26c4923c887bb2f9499a03f02816ed283b303e3e8d9b6241f1a26452112fdf73656fa7d2
SSDEEP

49152:bSvzrTtEBP/OlsLzFmNfW6FJKxxfZA4G:uvzuBP/OlsLzFmNfW6FJKxxfZA4G

Score

10^/10

asyncrat 27-07-2024 discovery rat

Malware Config

Extracted

Family

asyncrat

Version

AWS | 3Losh

Botnet

27-07-2024

C2

127.0.0.1:6000

104.243.32.185:6000

Mutex

AsyncMutex_alosh

Attributes

delay
3
install
false
install_folder
%AppData%

aes.plain

Signatures

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

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-1-5-21-4182098368-2521458979-3782681353-1000\Control Panel\International\Geo\Nation	4b4d72704210c1c4ed3cbd3e795446f0N.exe

Drops startup file 1 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\fontdrvhost.lnk	fontdrvhost.exe

Executes dropped EXE 1 IoCs

pid	Process
3708	fontdrvhost.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3708 set thread context of 1656	3708	fontdrvhost.exe	103

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 1 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	aspnet_compiler.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3708	fontdrvhost.exe
Token: SeDebugPrivilege	1656	aspnet_compiler.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2328 wrote to memory of 3708	2328	4b4d72704210c1c4ed3cbd3e795446f0N.exe	97
PID 2328 wrote to memory of 3708	2328	4b4d72704210c1c4ed3cbd3e795446f0N.exe	97
PID 3708 wrote to memory of 1656	3708	fontdrvhost.exe	103
PID 3708 wrote to memory of 1656	3708	fontdrvhost.exe	103
PID 3708 wrote to memory of 1656	3708	fontdrvhost.exe	103
PID 3708 wrote to memory of 1656	3708	fontdrvhost.exe	103
PID 3708 wrote to memory of 1656	3708	fontdrvhost.exe	103
PID 3708 wrote to memory of 1656	3708	fontdrvhost.exe	103
PID 3708 wrote to memory of 1656	3708	fontdrvhost.exe	103
PID 3708 wrote to memory of 1656	3708	fontdrvhost.exe	103

C:\Users\Admin\AppData\Local\Temp\4b4d72704210c1c4ed3cbd3e795446f0N.exe
"C:\Users\Admin\AppData\Local\Temp\4b4d72704210c1c4ed3cbd3e795446f0N.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2328
- C:\Users\Admin\AppData\Local\Microsoft\fontdrvhost.exe
  "C:\Users\Admin\AppData\Local\Microsoft\fontdrvhost.exe"
  2⤵
  - Drops startup file
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3708
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:1656

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Microsoft\fontdrvhost.exe

Filesize
2.5MB

MD5
4b4d72704210c1c4ed3cbd3e795446f0

SHA1
25b1643ced521f1ac8510a214b90a5f719dee571

SHA256
b4b664bcf91ad02e0e9583b80f98d7da73fd17e12ebd76a7c47fe013c9bc5b74

SHA512
242fa5e9987886a431d43538a381c6bf448aa1aca7d778b9b0d4c1ff26c4923c887bb2f9499a03f02816ed283b303e3e8d9b6241f1a26452112fdf73656fa7d2

Download Submit
memory/1656-24-0x0000000000400000-0x0000000000416000-memory.dmp

Filesize
88KB

Download
memory/1656-30-0x0000000005410000-0x0000000005476000-memory.dmp

Filesize
408KB

Download
memory/1656-29-0x0000000005950000-0x0000000005EF4000-memory.dmp

Filesize
5.6MB

Download
memory/1656-28-0x0000000005300000-0x000000000539C000-memory.dmp

Filesize
624KB

Download
memory/2328-0-0x00007FF8D9623000-0x00007FF8D9625000-memory.dmp

Filesize
8KB

Download
memory/2328-1-0x000002312E560000-0x000002312E7EA000-memory.dmp

Filesize
2.5MB

Download
memory/2328-2-0x00007FF8D9623000-0x00007FF8D9625000-memory.dmp

Filesize
8KB

Download
memory/2328-18-0x00007FF8D9620000-0x00007FF8DA0E1000-memory.dmp

Filesize
10.8MB

Download
memory/2328-3-0x000002312EBC0000-0x000002312EC06000-memory.dmp

Filesize
280KB

Download
memory/2328-16-0x00007FF8D9620000-0x00007FF8DA0E1000-memory.dmp

Filesize
10.8MB

Download
memory/3708-17-0x00007FF8D9620000-0x00007FF8DA0E1000-memory.dmp

Filesize
10.8MB

Download
memory/3708-19-0x00007FF8D9620000-0x00007FF8DA0E1000-memory.dmp

Filesize
10.8MB

Download
memory/3708-26-0x00007FF8D9620000-0x00007FF8DA0E1000-memory.dmp

Filesize
10.8MB

Download
memory/3708-27-0x00007FF8D9620000-0x00007FF8DA0E1000-memory.dmp

Filesize
10.8MB

Download
memory/3708-23-0x00007FF8D9620000-0x00007FF8DA0E1000-memory.dmp

Filesize
10.8MB

Download
memory/3708-21-0x000001D58E800000-0x000001D58E81E000-memory.dmp

Filesize
120KB

Download
memory/3708-20-0x000001D5A6F50000-0x000001D5A6FC6000-memory.dmp

Filesize
472KB

Download

Analysis

Sharing