asyncrat | ba357d25a91a07eb86e1412b47aa9e64b55c1b9bec4900d25726d615555d76b0

General

Target

ba357d25a91a07eb86e1412b47aa9e64b55c1b9bec4900d25726d615555d76b0.exe
Size

276KB
MD5

c7a0b1673cefe5ade7f9d5f96bd4bc85
SHA1

cd0a62a731f1e4c104d214164035950d274762d9
SHA256

ba357d25a91a07eb86e1412b47aa9e64b55c1b9bec4900d25726d615555d76b0
SHA512

ca706565e19b4209b78915d4489fc61ba77dc8d049f52ae02a8918534462471a01c25dfafd8c92fc4b5570830368d0d2f8ce726a7def5878ced7725f199afbfd
SSDEEP

768:uLFXd/g9buJS+3RrP8ftYY5l4LyM2jWbGvhjpZpfeN2:eFXd/g9buMWz8fCY74LD2jWavjZpfeN

Score

10^/10

asyncrat 8/4/2004 discovery rat

Malware Config

Extracted

Family

asyncrat

Version

| Edit by Vinom Rat

Botnet

8/4/2004

C2

luxeloot.info:2005

Mutex

AsyncMutex_345JNFV3c

Attributes

delay
3
install
false
install_file
ANON.EXE.exe
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-1-5-21-2170637797-568393320-3232933035-1000\Control Panel\International\Geo\Nation	ba357d25a91a07eb86e1412b47aa9e64b55c1b9bec4900d25726d615555d76b0.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
2784	fontdrvhost.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2784 set thread context of 4904	2784	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 behavior: EnumeratesProcesses 2 IoCs

pid	Process
4904	aspnet_compiler.exe
4904	aspnet_compiler.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2784	fontdrvhost.exe
Token: SeDebugPrivilege	4904	aspnet_compiler.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4904	aspnet_compiler.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 5088 wrote to memory of 2784	5088	ba357d25a91a07eb86e1412b47aa9e64b55c1b9bec4900d25726d615555d76b0.exe	98
PID 5088 wrote to memory of 2784	5088	ba357d25a91a07eb86e1412b47aa9e64b55c1b9bec4900d25726d615555d76b0.exe	98
PID 2784 wrote to memory of 4904	2784	fontdrvhost.exe	103
PID 2784 wrote to memory of 4904	2784	fontdrvhost.exe	103
PID 2784 wrote to memory of 4904	2784	fontdrvhost.exe	103
PID 2784 wrote to memory of 4904	2784	fontdrvhost.exe	103
PID 2784 wrote to memory of 4904	2784	fontdrvhost.exe	103
PID 2784 wrote to memory of 4904	2784	fontdrvhost.exe	103
PID 2784 wrote to memory of 4904	2784	fontdrvhost.exe	103
PID 2784 wrote to memory of 4904	2784	fontdrvhost.exe	103

C:\Users\Admin\AppData\Local\Temp\ba357d25a91a07eb86e1412b47aa9e64b55c1b9bec4900d25726d615555d76b0.exe
"C:\Users\Admin\AppData\Local\Temp\ba357d25a91a07eb86e1412b47aa9e64b55c1b9bec4900d25726d615555d76b0.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:5088
- 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:2784
- - 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 behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    PID:4904

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=4448,i,1330210614411927383,9239043499051775691,262144 --variations-seed-version --mojo-platform-channel-handle=4396 /prefetch:8
1⤵
PID:4028

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

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Downloads

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

Filesize
276KB

MD5
c7a0b1673cefe5ade7f9d5f96bd4bc85

SHA1
cd0a62a731f1e4c104d214164035950d274762d9

SHA256
ba357d25a91a07eb86e1412b47aa9e64b55c1b9bec4900d25726d615555d76b0

SHA512
ca706565e19b4209b78915d4489fc61ba77dc8d049f52ae02a8918534462471a01c25dfafd8c92fc4b5570830368d0d2f8ce726a7def5878ced7725f199afbfd

Download Submit
memory/2784-15-0x00007FFCBAA60000-0x00007FFCBB521000-memory.dmp

Filesize
10.8MB

Download
memory/2784-11-0x00007FFCBAA60000-0x00007FFCBB521000-memory.dmp

Filesize
10.8MB

Download
memory/2784-12-0x000001A2A6390000-0x000001A2A6406000-memory.dmp

Filesize
472KB

Download
memory/2784-13-0x000001A2A6350000-0x000001A2A636E000-memory.dmp

Filesize
120KB

Download
memory/2784-18-0x00007FFCBAA60000-0x00007FFCBB521000-memory.dmp

Filesize
10.8MB

Download
memory/4904-16-0x0000000000400000-0x0000000000416000-memory.dmp

Filesize
88KB

Download
memory/4904-19-0x00000000056B0000-0x0000000005C54000-memory.dmp

Filesize
5.6MB

Download
memory/4904-20-0x00000000052E0000-0x0000000005372000-memory.dmp

Filesize
584KB

Download
memory/4904-21-0x00000000052D0000-0x00000000052DA000-memory.dmp

Filesize
40KB

Download
memory/4904-24-0x00000000061A0000-0x000000000623C000-memory.dmp

Filesize
624KB

Download
memory/4904-25-0x00000000065A0000-0x0000000006606000-memory.dmp

Filesize
408KB

Download
memory/5088-0-0x00000205DB790000-0x00000205DB7DA000-memory.dmp

Filesize
296KB

Download
memory/5088-1-0x00007FFCBAA63000-0x00007FFCBAA65000-memory.dmp

Filesize
8KB

Download

Analysis

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