asyncrat | d018a74363e5e2667f51319c7ff5244ef14ac17aca77afc9062ffb5fef60128c

General

Target
RAT.exe
Size 56KB
Sample261024-gpexmsf17z
SHA256 d018a74363e5e2667f51319c7ff5244ef14ac17aca77afc9062ffb5fef60128c
MD5 18508e944d658d0c7dd8b0aa114cfdb3
SHA1 76bb10e380a75b97c47d3f9dc8ed5c97fe14c288
SHA512 293719e5faa6d7f1118f0fc5f261c482ee824de822d23dd30e6fdcb5b72a7c70e8434063b12727299674c054bf81ad88c9f3b229430da49cd283569b016e8f9d
SSDEEP 1536:Cuf09TH2w240lVJj+bSXSbhI+fNdRkejNUHLTq:CufoTH2w2FTj+bSYhDlvkINmq
TLSH
T157435C0037E9812BF2BE4F78ADF21144867AF2676603E55D2CC451DB5A13FC6CA426FA
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

C2

h99.online:443
h99.online:8848
h99.online:8080

Mutex

kBVPjakHQ19X

Attributes

delay
3
install
true
install_file
AsyncRat.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
behavioral1/files/0x0009000000024493-8.dat	family_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-1-5-21-895009113-1202185046-1686627690-1000\Control Panel\International\Geo\Nation	RAT.exe

Executes dropped EXE 2 IoCs

pid	Process
2108	AsyncRat.exe
4752	AsyncRat.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
696	cmd.exe
4344	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\Hostname	AsyncRat.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	AsyncRat.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	RAT.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	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AsyncRat.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AsyncRat.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
408	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
4280	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
4740	RAT.exe
4740	RAT.exe
4740	RAT.exe
4740	RAT.exe
4740	RAT.exe
4740	RAT.exe
4740	RAT.exe
4740	RAT.exe
4740	RAT.exe
4740	RAT.exe
4740	RAT.exe
4740	RAT.exe
4740	RAT.exe
4740	RAT.exe
4740	RAT.exe
4740	RAT.exe
4740	RAT.exe
4740	RAT.exe
4740	RAT.exe
4740	RAT.exe
4740	RAT.exe
4740	RAT.exe
4740	RAT.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4740	RAT.exe
Token: SeDebugPrivilege	2108	AsyncRat.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4740 wrote to memory of 696	4740	RAT.exe	90
PID 4740 wrote to memory of 4344	4740	RAT.exe	92
PID 4344 wrote to memory of 408	4344	cmd.exe	94
PID 696 wrote to memory of 4280	696	cmd.exe	95
PID 4344 wrote to memory of 4752	4344	cmd.exe	99

C:\Users\Admin\AppData\Local\Temp\RAT.exe
"C:\Users\Admin\AppData\Local\Temp\RAT.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4740
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "AsyncRat" /tr '"C:\Users\Admin\AppData\Roaming\AsyncRat.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:696
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "AsyncRat" /tr '"C:\Users\Admin\AppData\Roaming\AsyncRat.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:4280
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp93A0.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4344
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:408
- - C:\Users\Admin\AppData\Roaming\AsyncRat.exe
    "C:\Users\Admin\AppData\Roaming\AsyncRat.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:4752

C:\Users\Admin\AppData\Roaming\AsyncRat.exe
"C:\Users\Admin\AppData\Roaming\AsyncRat.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:2108

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

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

System Network Configuration Discovery

1

T1016

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

tmp93A0.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp93A0.tmp.bat
Size 152B
SHA256 d963f2ec20e3f54afa8a34497d5c0f3222dc5707278d9b970e67528fc9e6690a
MD5 afc1e318a071b791364e0938f148986b
SHA1 4b57daa89c86e8959c0053522d339f6c3798239e
SHA512 ac8a30cb7fb33e0ca99b58516a0eef2fb2908dc514cc2e668ab10571d7b404375f7188bdb24f9f9f953931f094448be65749e141b6819ce498e3591db11aa82a
TLSH
T106C02B5692C6EB1F6C05341313FADCCC91766C693F40BB40D30848AD128094CF0E9381
MD5 SHA1 SHA512 TLSH

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AsyncRat.exe

Path C:\Users\Admin\AppData\Roaming\AsyncRat.exe
Size 56KB
SHA256 d018a74363e5e2667f51319c7ff5244ef14ac17aca77afc9062ffb5fef60128c
MD5 18508e944d658d0c7dd8b0aa114cfdb3
SHA1 76bb10e380a75b97c47d3f9dc8ed5c97fe14c288
SHA512 293719e5faa6d7f1118f0fc5f261c482ee824de822d23dd30e6fdcb5b72a7c70e8434063b12727299674c054bf81ad88c9f3b229430da49cd283569b016e8f9d
SSDEEP 1536:Cuf09TH2w240lVJj+bSXSbhI+fNdRkejNUHLTq:CufoTH2w2FTj+bSYhDlvkINmq
TLSH
T157435C0037E9812BF2BE4F78ADF21144867AF2676603E55D2CC451DB5A13FC6CA426FA
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4740-0-0x0000000000320000-0x0000000000334000-memory.dmp

Download

memory/4740-1-0x0000000004C20000-0x0000000004C30000-memory.dmp

Download

memory/4740-2-0x0000000004CE0000-0x0000000004D7C000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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