asyncrat | 0f07d465b2fb93b367ff2a393574f87b932e4627591091bf8f2f94d3c8e75715

General

Target
556407eba4cd85a57fdb6dcdb12e2269.exe
Size 45KB
Sample240729-p8m2cstdqb
SHA256 0f07d465b2fb93b367ff2a393574f87b932e4627591091bf8f2f94d3c8e75715
MD5 556407eba4cd85a57fdb6dcdb12e2269
SHA1 d68a0f0831556c4ef3fb3e003385e897a210b751
SHA512 d7baa345dac09eb418604a3d6ace4af0a54cb2b5a627967bc9ccdbb5ee5021ef6dd1e042fcc4165aeb5a38f8583af56f99e5472fa1442ee0335cf62e9664c6c0
SSDEEP 768:uuokxmFTkUE1YAgWUOl1nyamo2qR+1uGJAIGYPPI3njbMgX3iWHCHiGTCE2BDZax:uuokxmFTkUMYi1t2HsNx3jbDXSWHnGm0
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

193.23.160.13:7707

Mutex

zTAsGorHPqSl

Attributes

delay
3
install
true
install_file
Server-Host.exe
install_folder
%AppData%

aes.plain

Signatures

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/0x0004000000004ed7-14.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2832	Server-Host.exe

Loads dropped DLL 1 IoCs

pid	Process
2764	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	556407eba4cd85a57fdb6dcdb12e2269.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-Host.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2768	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
2868	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2324	556407eba4cd85a57fdb6dcdb12e2269.exe
2324	556407eba4cd85a57fdb6dcdb12e2269.exe
2324	556407eba4cd85a57fdb6dcdb12e2269.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2324	556407eba4cd85a57fdb6dcdb12e2269.exe
Token: SeDebugPrivilege	2832	Server-Host.exe
Token: SeDebugPrivilege	2832	Server-Host.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 2324 wrote to memory of 2760	2324	556407eba4cd85a57fdb6dcdb12e2269.exe	32
PID 2324 wrote to memory of 2760	2324	556407eba4cd85a57fdb6dcdb12e2269.exe	32
PID 2324 wrote to memory of 2760	2324	556407eba4cd85a57fdb6dcdb12e2269.exe	32
PID 2324 wrote to memory of 2760	2324	556407eba4cd85a57fdb6dcdb12e2269.exe	32
PID 2324 wrote to memory of 2764	2324	556407eba4cd85a57fdb6dcdb12e2269.exe	34
PID 2324 wrote to memory of 2764	2324	556407eba4cd85a57fdb6dcdb12e2269.exe	34
PID 2324 wrote to memory of 2764	2324	556407eba4cd85a57fdb6dcdb12e2269.exe	34
PID 2324 wrote to memory of 2764	2324	556407eba4cd85a57fdb6dcdb12e2269.exe	34
PID 2760 wrote to memory of 2868	2760	cmd.exe	36
PID 2760 wrote to memory of 2868	2760	cmd.exe	36
PID 2760 wrote to memory of 2868	2760	cmd.exe	36
PID 2760 wrote to memory of 2868	2760	cmd.exe	36
PID 2764 wrote to memory of 2768	2764	cmd.exe	37
PID 2764 wrote to memory of 2768	2764	cmd.exe	37
PID 2764 wrote to memory of 2768	2764	cmd.exe	37
PID 2764 wrote to memory of 2768	2764	cmd.exe	37
PID 2764 wrote to memory of 2832	2764	cmd.exe	38
PID 2764 wrote to memory of 2832	2764	cmd.exe	38
PID 2764 wrote to memory of 2832	2764	cmd.exe	38
PID 2764 wrote to memory of 2832	2764	cmd.exe	38

C:\Users\Admin\AppData\Local\Temp\556407eba4cd85a57fdb6dcdb12e2269.exe
"C:\Users\Admin\AppData\Local\Temp\556407eba4cd85a57fdb6dcdb12e2269.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2324
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Server-Host" /tr '"C:\Users\Admin\AppData\Roaming\Server-Host.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2760
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "Server-Host" /tr '"C:\Users\Admin\AppData\Roaming\Server-Host.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2868
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpF805.tmp.bat""
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2764
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2768
- - C:\Users\Admin\AppData\Roaming\Server-Host.exe
    "C:\Users\Admin\AppData\Roaming\Server-Host.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2832

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

Cab1815.tmp

Path C:\Users\Admin\AppData\Local\Temp\Cab1815.tmp
Size 70KB
SHA256 b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f
MD5 49aebf8cbd62d92ac215b2923fb1b9f5
SHA1 1723be06719828dda65ad804298d0431f6aff976
SHA512 bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b
SSDEEP 1536:gc257bHnClJ3v5mnAQEBP+bfnW8Ctl8G1G4eu76NWDdB34w18R5cBWcJAm68+Q:gp2ld5jPqW8LgeulxB3fgcEfDQ
MD5 SHA1 SHA512 SSDEEP

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tmpF805.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmpF805.tmp.bat
Size 155B
SHA256 00a66e9809dd6962d859cc04855f455c9febb65b98e47053e645fa921689d6b1
MD5 cd93461646d7ef188a3ffe48df2ce1b5
SHA1 bbdb185ca1f66f0f795c54efc1b1bd1fe778127a
SHA512 81b3e37fe0a7e148bb52b28a17b0e9bacb196d06ea094c5de1019e6d8aae23b854169960f69e695a2ed86cc2bec0198d5861bd151d31942257e8e6e6494f8511
MD5 SHA1 SHA512

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Server-Host.exe

Path C:\Users\Admin\AppData\Roaming\Server-Host.exe
Size 45KB
SHA256 0f07d465b2fb93b367ff2a393574f87b932e4627591091bf8f2f94d3c8e75715
MD5 556407eba4cd85a57fdb6dcdb12e2269
SHA1 d68a0f0831556c4ef3fb3e003385e897a210b751
SHA512 d7baa345dac09eb418604a3d6ace4af0a54cb2b5a627967bc9ccdbb5ee5021ef6dd1e042fcc4165aeb5a38f8583af56f99e5472fa1442ee0335cf62e9664c6c0
SSDEEP 768:uuokxmFTkUE1YAgWUOl1nyamo2qR+1uGJAIGYPPI3njbMgX3iWHCHiGTCE2BDZax:uuokxmFTkUMYi1t2HsNx3jbDXSWHnGm0
MD5 SHA1 SHA512 SSDEEP

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memory/2324-0-0x0000000074A6E000-0x0000000074A6F000-memory.dmp

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memory/2324-1-0x0000000000900000-0x0000000000912000-memory.dmp

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memory/2324-2-0x0000000074A60000-0x000000007514E000-memory.dmp

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memory/2324-12-0x0000000074A60000-0x000000007514E000-memory.dmp

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memory/2832-16-0x0000000000190000-0x00000000001A2000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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