asyncrat | 02d242ea2f9251a46c8fc7fdc8a7c00a64491f015b3b8dbe11ff7afaff3fa7c9

General

Target

AsyncClient.exe
Size

45KB
MD5

87b6917db381131a861ba84d4269b0bd
SHA1

801e58b238a02f2d0bb972ee230e77f4bfe4baa1
SHA256

02d242ea2f9251a46c8fc7fdc8a7c00a64491f015b3b8dbe11ff7afaff3fa7c9
SHA512

b297874e06ff77aa8115f9935a7b13fd34a472f904f960708f9c8c86881c6256834362fe8bbdee35914a132d9db4b5fc7f2fb6d418f042cbf5d8a89c5bf5fb6e
SSDEEP

768:/u67dTAYhbJWUh9Nzmo2qLIKjPGaG6PIyzjbFgX3iuzTMsfaP9c9CysmBDZER:/u67dTAur2RKTkDy3bCXSoMWaP9QjdER

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

127.0.0.1:6606

127.0.0.1:7707

127.0.0.1:8808

149.143.127.81:6606

149.143.127.81:7707

149.143.127.81:8808

Mutex

RPDOrlBP5iQP

Attributes

delay
3
install
true
install_file
Update.exe
install_folder
%Temp%

aes.plain

Signatures

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

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral1/files/0x000c000000012263-13.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2808	Update.exe

Loads dropped DLL 1 IoCs

pid	Process
2788	cmd.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 6 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	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Update.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AsyncClient.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

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2720	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
2908	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2084	AsyncClient.exe
2084	AsyncClient.exe
2084	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2084	AsyncClient.exe
Token: SeDebugPrivilege	2808	Update.exe
Token: SeDebugPrivilege	2808	Update.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 2084 wrote to memory of 2668	2084	AsyncClient.exe	31
PID 2084 wrote to memory of 2668	2084	AsyncClient.exe	31
PID 2084 wrote to memory of 2668	2084	AsyncClient.exe	31
PID 2084 wrote to memory of 2668	2084	AsyncClient.exe	31
PID 2084 wrote to memory of 2788	2084	AsyncClient.exe	33
PID 2084 wrote to memory of 2788	2084	AsyncClient.exe	33
PID 2084 wrote to memory of 2788	2084	AsyncClient.exe	33
PID 2084 wrote to memory of 2788	2084	AsyncClient.exe	33
PID 2668 wrote to memory of 2908	2668	cmd.exe	35
PID 2668 wrote to memory of 2908	2668	cmd.exe	35
PID 2668 wrote to memory of 2908	2668	cmd.exe	35
PID 2668 wrote to memory of 2908	2668	cmd.exe	35
PID 2788 wrote to memory of 2720	2788	cmd.exe	36
PID 2788 wrote to memory of 2720	2788	cmd.exe	36
PID 2788 wrote to memory of 2720	2788	cmd.exe	36
PID 2788 wrote to memory of 2720	2788	cmd.exe	36
PID 2788 wrote to memory of 2808	2788	cmd.exe	37
PID 2788 wrote to memory of 2808	2788	cmd.exe	37
PID 2788 wrote to memory of 2808	2788	cmd.exe	37
PID 2788 wrote to memory of 2808	2788	cmd.exe	37
PID 2788 wrote to memory of 2808	2788	cmd.exe	37
PID 2788 wrote to memory of 2808	2788	cmd.exe	37
PID 2788 wrote to memory of 2808	2788	cmd.exe	37

C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe
"C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2084
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Update" /tr '"C:\Users\Admin\AppData\Local\Temp\Update.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2668
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "Update" /tr '"C:\Users\Admin\AppData\Local\Temp\Update.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2908
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp9647.tmp.bat""
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2788
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2720
- - C:\Users\Admin\AppData\Local\Temp\Update.exe
    "C:\Users\Admin\AppData\Local\Temp\Update.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2808

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

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

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\CabEC54.tmp

Filesize
70KB

MD5
49aebf8cbd62d92ac215b2923fb1b9f5

SHA1
1723be06719828dda65ad804298d0431f6aff976

SHA256
b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f

SHA512
bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

Download Submit
C:\Users\Admin\AppData\Local\Temp\Tar88A5.tmp

Filesize
181KB

MD5
4ea6026cf93ec6338144661bf1202cd1

SHA1
a1dec9044f750ad887935a01430bf49322fbdcb7

SHA256
8efbc21559ef8b1bcf526800d8070baad42474ce7198e26fa771dbb41a76b1d8

SHA512
6c7e0980e39aacf4c3689802353f464a08cd17753bd210ee997e5f2a455deb4f287a9ef74d84579dbde49bc96213cd2b8b247723919c412ea980aa6e6bfe218b

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp9647.tmp.bat

Filesize
153B

MD5
34e170771c9932a52faf86f66550bb1c

SHA1
1ec15f44df2b8c796ca1c752d4509bb41b077192

SHA256
12686e2545f0b2a7b80458aebfa86a5b60a2f2a44c69da6134a541ca1d4af62b

SHA512
840ef5ec919650973ffe8c05c9498207be6c3cebec29f75957aff8a82444a698959bd19754ee52819f91b23b7194eec255433c4d95645d010478f8329f33ad59

Download Submit
\Users\Admin\AppData\Local\Temp\Update.exe

Filesize
45KB

MD5
87b6917db381131a861ba84d4269b0bd

SHA1
801e58b238a02f2d0bb972ee230e77f4bfe4baa1

SHA256
02d242ea2f9251a46c8fc7fdc8a7c00a64491f015b3b8dbe11ff7afaff3fa7c9

SHA512
b297874e06ff77aa8115f9935a7b13fd34a472f904f960708f9c8c86881c6256834362fe8bbdee35914a132d9db4b5fc7f2fb6d418f042cbf5d8a89c5bf5fb6e

Download Submit
memory/2084-0-0x00000000742DE000-0x00000000742DF000-memory.dmp

Filesize
4KB

Download
memory/2084-1-0x0000000001310000-0x0000000001322000-memory.dmp

Filesize
72KB

Download
memory/2084-2-0x00000000742D0000-0x00000000749BE000-memory.dmp

Filesize
6.9MB

Download
memory/2084-11-0x00000000742D0000-0x00000000749BE000-memory.dmp

Filesize
6.9MB

Download
memory/2808-16-0x00000000009A0000-0x00000000009B2000-memory.dmp

Filesize
72KB

Download
memory/2808-34-0x0000000004AE0000-0x0000000004B44000-memory.dmp

Filesize
400KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads