asyncrat | 136ed00b06adbf6e557472a882a0f10bbd07d9d5ed19ff285d0a475f0786084a

General

Target

flash/flash.exe
Size

450KB
MD5

669a5b5d993f472a4ab68e4405649fde
SHA1

56332c906d54312d99e71c649cbd7fe1e0639c83
SHA256

29372ef20086423e80fecb84a9ad7980f781433772c6d05f3134037ab819badc
SHA512

46012e73b835372c0c9f424c8afeb8cf2b29a8c03023d6265534da55f310c2cdd682590deafe065430980d9608733db5da65f59d7dc650f7347408b31a8e7ae8
SSDEEP

12288:Ih1Lk70TnvjcbqPOdpMFgclmThae2zsWFBjlSc+n:Uk70Trce2d4JKUsWLlP6

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

Link-Quit

Botnet

Default

C2

info.ctxcel.com:443

Mutex

DcRatMutex_qwqdanchun

Attributes

delay
1
install
true
install_file
server.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

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral1/memory/1956-16-0x0000000005070000-0x0000000005086000-memory.dmp	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2720	server.exe

Loads dropped DLL 1 IoCs

pid	Process
2760	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	flash.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	server.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2728	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
2748	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
1956	flash.exe
1956	flash.exe
1956	flash.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	1956	flash.exe
Token: SeDebugPrivilege	1956	flash.exe
Token: SeDebugPrivilege	2720	server.exe
Token: SeDebugPrivilege	2720	server.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 1956 wrote to memory of 1628	1956	flash.exe	30
PID 1956 wrote to memory of 1628	1956	flash.exe	30
PID 1956 wrote to memory of 1628	1956	flash.exe	30
PID 1956 wrote to memory of 1628	1956	flash.exe	30
PID 1956 wrote to memory of 2760	1956	flash.exe	32
PID 1956 wrote to memory of 2760	1956	flash.exe	32
PID 1956 wrote to memory of 2760	1956	flash.exe	32
PID 1956 wrote to memory of 2760	1956	flash.exe	32
PID 1628 wrote to memory of 2748	1628	cmd.exe	34
PID 1628 wrote to memory of 2748	1628	cmd.exe	34
PID 1628 wrote to memory of 2748	1628	cmd.exe	34
PID 1628 wrote to memory of 2748	1628	cmd.exe	34
PID 2760 wrote to memory of 2728	2760	cmd.exe	35
PID 2760 wrote to memory of 2728	2760	cmd.exe	35
PID 2760 wrote to memory of 2728	2760	cmd.exe	35
PID 2760 wrote to memory of 2728	2760	cmd.exe	35
PID 2760 wrote to memory of 2720	2760	cmd.exe	36
PID 2760 wrote to memory of 2720	2760	cmd.exe	36
PID 2760 wrote to memory of 2720	2760	cmd.exe	36
PID 2760 wrote to memory of 2720	2760	cmd.exe	36

C:\Users\Admin\AppData\Local\Temp\flash\flash.exe
"C:\Users\Admin\AppData\Local\Temp\flash\flash.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1956
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "server" /tr '"C:\Users\Admin\AppData\Roaming\server.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1628
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "server" /tr '"C:\Users\Admin\AppData\Roaming\server.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2748
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpB339.tmp.bat""
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2760
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2728
- - C:\Users\Admin\AppData\Roaming\server.exe
    "C:\Users\Admin\AppData\Roaming\server.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2720

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\tmpB339.tmp.bat

Filesize
150B

MD5
a3e53f26966121b08584a8d0b1459eca

SHA1
00d96abf87e184befb6a6d95d80b1b75b9b68e7a

SHA256
61ce3ffbf561e52401baf76f9a73b69e81cb5ed12cb9818053b46d1983ef13c7

SHA512
d59e5178f5de7c41f13c6af603d46f50f26e7ef7a04b688eb9ed0a6ec13cb2e9004b848b15ef9e37c3c09cc04e268bc290a538aefbece3be941871de1100efd2

Download Submit
C:\Users\Admin\AppData\Roaming\server.exe

Filesize
450KB

MD5
669a5b5d993f472a4ab68e4405649fde

SHA1
56332c906d54312d99e71c649cbd7fe1e0639c83

SHA256
29372ef20086423e80fecb84a9ad7980f781433772c6d05f3134037ab819badc

SHA512
46012e73b835372c0c9f424c8afeb8cf2b29a8c03023d6265534da55f310c2cdd682590deafe065430980d9608733db5da65f59d7dc650f7347408b31a8e7ae8

Download Submit
memory/1956-6-0x0000000002270000-0x00000000022C8000-memory.dmp

Filesize
352KB

Download
memory/1956-14-0x0000000074C60000-0x000000007534E000-memory.dmp

Filesize
6.9MB

Download
memory/1956-3-0x0000000002270000-0x00000000022D0000-memory.dmp

Filesize
384KB

Download
memory/1956-5-0x0000000074C60000-0x000000007534E000-memory.dmp

Filesize
6.9MB

Download
memory/1956-13-0x0000000002270000-0x00000000022C8000-memory.dmp

Filesize
352KB

Download
memory/1956-7-0x0000000002270000-0x00000000022C8000-memory.dmp

Filesize
352KB

Download
memory/1956-11-0x0000000002270000-0x00000000022C8000-memory.dmp

Filesize
352KB

Download
memory/1956-9-0x0000000002270000-0x00000000022C8000-memory.dmp

Filesize
352KB

Download
memory/1956-0-0x0000000074C6E000-0x0000000074C6F000-memory.dmp

Filesize
4KB

Download
memory/1956-4-0x0000000074C60000-0x000000007534E000-memory.dmp

Filesize
6.9MB

Download
memory/1956-15-0x0000000074C60000-0x000000007534E000-memory.dmp

Filesize
6.9MB

Download
memory/1956-17-0x0000000074C60000-0x000000007534E000-memory.dmp

Filesize
6.9MB

Download
memory/1956-16-0x0000000005070000-0x0000000005086000-memory.dmp

Filesize
88KB

Download
memory/1956-18-0x0000000074C60000-0x000000007534E000-memory.dmp

Filesize
6.9MB

Download
memory/1956-27-0x0000000074C60000-0x000000007534E000-memory.dmp

Filesize
6.9MB

Download
memory/1956-29-0x0000000074C60000-0x000000007534E000-memory.dmp

Filesize
6.9MB

Download
memory/1956-2-0x0000000074C60000-0x000000007534E000-memory.dmp

Filesize
6.9MB

Download
memory/1956-1-0x0000000002000000-0x0000000002060000-memory.dmp

Filesize
384KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads