asyncrat | 376c244a85ecd70f32daeb1a1022f0540682526ee8618b1d1b3b5489fc2de5ef

General

Target
New folder/sys1.exe
Size 78KB
Sample240504-m5ymksca5z
SHA256 73daf4be0b78f20916eb75bdcf49c55445f24d6966ebb63e27fee354dc670d52
MD5 282462fa1cf7592d82b8bc63f8cca024
SHA1 f6d4d971d4bac357ae22a74f68a55b557d5ac69d
SHA512 b36cd8b0fef03994eb94376ccd09984d50b7e445955accfb6096c696e5219a036ba1e99c6a230045a83d3ae48a3e188b208f96c6395a7ed1567b52822bd806f8
SSDEEP 1536:1EDhxf8JYs1rRb64YUbah9IuuuNIEMdpqKmY7:iH8qeYUbaV1IEMGz
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Botnet

Default

C2

127.0.0.1:3232
192.168.0.194:3232

Attributes

delay
4
install
true
install_file
sys1.exe
install_folder
%Temp%

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
behavioral2/files/0x00210000000234f4-10.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-1-5-21-2818691465-3043947619-2475182763-1000\Control Panel\International\Geo\Nation	sys1.exe

Executes dropped EXE 1 IoCs

pid	Process
2292	sys1.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
2168	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
4860	timeout.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

pid	Process
800	sys1.exe
800	sys1.exe
800	sys1.exe
800	sys1.exe
800	sys1.exe
800	sys1.exe
800	sys1.exe
800	sys1.exe
800	sys1.exe
800	sys1.exe
800	sys1.exe
800	sys1.exe
800	sys1.exe
800	sys1.exe
800	sys1.exe
800	sys1.exe
800	sys1.exe
800	sys1.exe
800	sys1.exe
800	sys1.exe
800	sys1.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	800	sys1.exe
Token: SeDebugPrivilege	2292	sys1.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 800 wrote to memory of 380	800	sys1.exe	95
PID 800 wrote to memory of 380	800	sys1.exe	95
PID 800 wrote to memory of 4636	800	sys1.exe	97
PID 800 wrote to memory of 4636	800	sys1.exe	97
PID 380 wrote to memory of 2168	380	cmd.exe	99
PID 380 wrote to memory of 2168	380	cmd.exe	99
PID 4636 wrote to memory of 4860	4636	cmd.exe	100
PID 4636 wrote to memory of 4860	4636	cmd.exe	100
PID 4636 wrote to memory of 2292	4636	cmd.exe	102
PID 4636 wrote to memory of 2292	4636	cmd.exe	102

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\New folder\sys1.exe
"C:\Users\Admin\AppData\Local\Temp\New folder\sys1.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:800
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "sys1" /tr '"C:\Users\Admin\AppData\Local\Temp\sys1.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:380
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "sys1" /tr '"C:\Users\Admin\AppData\Local\Temp\sys1.exe"'
    3⤵
    - Creates scheduled task(s)
    PID:2168
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp446B.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4636
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:4860
- - C:\Users\Admin\AppData\Local\Temp\sys1.exe
    "C:\Users\Admin\AppData\Local\Temp\sys1.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:2292

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Scheduled Task/Job

1

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

sys1.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\sys1.exe.log
Size 871B
SHA256 5e1611e4d915fd9759825811fa4463f09172889f85889a2942be1561948fab8a
MD5 d58f949aad7df2e7b55248bfdfc6e1b8
SHA1 6713cad396b5808b66ede2dd9b169e00d5e5018f
SHA512 bdddb838108c4f3f0a7737703cbde935fe26aaea97459bb099c4c773c0789997283d7f20ac7ea4ac2aedef23515afc0b251b5b461aa12d3b7a60846b87b26e38
MD5 SHA1 SHA512

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sys1.exe

Path C:\Users\Admin\AppData\Local\Temp\sys1.exe
Size 78KB
SHA256 73daf4be0b78f20916eb75bdcf49c55445f24d6966ebb63e27fee354dc670d52
MD5 282462fa1cf7592d82b8bc63f8cca024
SHA1 f6d4d971d4bac357ae22a74f68a55b557d5ac69d
SHA512 b36cd8b0fef03994eb94376ccd09984d50b7e445955accfb6096c696e5219a036ba1e99c6a230045a83d3ae48a3e188b208f96c6395a7ed1567b52822bd806f8
SSDEEP 1536:1EDhxf8JYs1rRb64YUbah9IuuuNIEMdpqKmY7:iH8qeYUbaV1IEMGz
MD5 SHA1 SHA512 SSDEEP

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tmp446B.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp446B.tmp.bat
Size 151B
SHA256 c1449b3cc0c43b99cac8615439e2aa368f2775a7a6d1d0c63ae231928178c545
MD5 6067c7404b2fbb66471378ae078430f6
SHA1 85c8cda53a4971c74a3b1755702e13fd2c1d82d0
SHA512 f817f3ed618e9ff11c03723b3b98d5906ff690898f94069adb163bf517938a4310045ca170fc348d50bd5a4cf520eb4dc3f78dae2b8476a7ce40cf6416eb1eac
MD5 SHA1 SHA512

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memory/800-0-0x0000000000120000-0x000000000013A000-memory.dmp

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memory/800-1-0x00007FFCA4693000-0x00007FFCA4695000-memory.dmp

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memory/800-2-0x00007FFCA4690000-0x00007FFCA5151000-memory.dmp

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memory/800-7-0x00007FFCA4690000-0x00007FFCA5151000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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