asyncrat | daabb8e4bc8f4fc2d09620a93473c25c1bac1f33478596436398d5ff9126b535

General

Target

dsa.exe._obf.exe
Size

51KB
MD5

bbd301b6d42c6949ba78ff302cdeed5d
SHA1

735b2051bc7e43f3e5a82ab9c076d2547936b4bf
SHA256

daabb8e4bc8f4fc2d09620a93473c25c1bac1f33478596436398d5ff9126b535
SHA512

030c1927bc0da15fce723c799ddd3ec134f1da551143574bbf70ba2fd467875472cc14be5200b3c86566e8e21b77cedb192cfbb6a00bf1ec27e45e6f79aad7e0
SSDEEP

1536:qVBuT4hsvH6SMBccyb2G6KpH3B7q0nWnvhHUmax:qVBuewaSMicyb2cpHNRnYpHUXx

Score

10^/10

asyncrat discovery rat

Malware Config

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/0x000b000000023b6c-11.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-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	dsa.exe._obf.exe

Executes dropped EXE 1 IoCs

pid	Process
2480	System32.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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	System32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	dsa.exe._obf.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2320	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
5024	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
4076	dsa.exe._obf.exe
4076	dsa.exe._obf.exe
4076	dsa.exe._obf.exe
4076	dsa.exe._obf.exe
4076	dsa.exe._obf.exe
4076	dsa.exe._obf.exe
4076	dsa.exe._obf.exe
4076	dsa.exe._obf.exe
4076	dsa.exe._obf.exe
4076	dsa.exe._obf.exe
4076	dsa.exe._obf.exe
4076	dsa.exe._obf.exe
4076	dsa.exe._obf.exe
4076	dsa.exe._obf.exe
4076	dsa.exe._obf.exe
4076	dsa.exe._obf.exe
4076	dsa.exe._obf.exe
4076	dsa.exe._obf.exe
4076	dsa.exe._obf.exe
4076	dsa.exe._obf.exe
4076	dsa.exe._obf.exe
4076	dsa.exe._obf.exe
4076	dsa.exe._obf.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4076	dsa.exe._obf.exe
Token: SeDebugPrivilege	2480	System32.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4076 wrote to memory of 1932	4076	dsa.exe._obf.exe	87
PID 4076 wrote to memory of 1932	4076	dsa.exe._obf.exe	87
PID 4076 wrote to memory of 1932	4076	dsa.exe._obf.exe	87
PID 4076 wrote to memory of 3968	4076	dsa.exe._obf.exe	89
PID 4076 wrote to memory of 3968	4076	dsa.exe._obf.exe	89
PID 4076 wrote to memory of 3968	4076	dsa.exe._obf.exe	89
PID 1932 wrote to memory of 5024	1932	cmd.exe	91
PID 1932 wrote to memory of 5024	1932	cmd.exe	91
PID 1932 wrote to memory of 5024	1932	cmd.exe	91
PID 3968 wrote to memory of 2320	3968	cmd.exe	92
PID 3968 wrote to memory of 2320	3968	cmd.exe	92
PID 3968 wrote to memory of 2320	3968	cmd.exe	92
PID 3968 wrote to memory of 2480	3968	cmd.exe	93
PID 3968 wrote to memory of 2480	3968	cmd.exe	93
PID 3968 wrote to memory of 2480	3968	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\dsa.exe._obf.exe
"C:\Users\Admin\AppData\Local\Temp\dsa.exe._obf.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4076
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "System32" /tr '"C:\Users\Admin\AppData\Roaming\System32.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1932
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "System32" /tr '"C:\Users\Admin\AppData\Roaming\System32.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:5024
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp7B98.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3968
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2320
- - C:\Users\Admin\AppData\Roaming\System32.exe
    "C:\Users\Admin\AppData\Roaming\System32.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2480

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

Query Registry

1

T1012

System Information Discovery

2

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\tmp7B98.tmp.bat

Filesize
152B

MD5
c851a32ffbc6b6e07becc97e73b4363d

SHA1
77d313b6407616863cfe8377b107946493b218af

SHA256
f49de28a1318e333b12927a645cc6d6e88c01ccb090a585bffe23ce80ad565ef

SHA512
063a74d6fcb2211d82c5f95a40eab93f3ee39f82550619ef6c1e604dfa3a502c7216541296e4d2dea66da16d062a530ab4e90c7c5fbe0e261bfd72b3abfa8d59

Download Submit
C:\Users\Admin\AppData\Roaming\System32.exe

Filesize
51KB

MD5
bbd301b6d42c6949ba78ff302cdeed5d

SHA1
735b2051bc7e43f3e5a82ab9c076d2547936b4bf

SHA256
daabb8e4bc8f4fc2d09620a93473c25c1bac1f33478596436398d5ff9126b535

SHA512
030c1927bc0da15fce723c799ddd3ec134f1da551143574bbf70ba2fd467875472cc14be5200b3c86566e8e21b77cedb192cfbb6a00bf1ec27e45e6f79aad7e0

Download Submit
memory/2480-17-0x00000000055F0000-0x0000000005656000-memory.dmp

Filesize
408KB

Download
memory/2480-13-0x0000000074A10000-0x00000000751C0000-memory.dmp

Filesize
7.7MB

Download
memory/2480-16-0x0000000005AD0000-0x0000000006074000-memory.dmp

Filesize
5.6MB

Download
memory/2480-18-0x0000000074A10000-0x00000000751C0000-memory.dmp

Filesize
7.7MB

Download
memory/2480-19-0x0000000006680000-0x00000000066F6000-memory.dmp

Filesize
472KB

Download
memory/2480-20-0x0000000006600000-0x0000000006668000-memory.dmp

Filesize
416KB

Download
memory/2480-21-0x0000000006740000-0x000000000675E000-memory.dmp

Filesize
120KB

Download
memory/2480-22-0x0000000006A70000-0x0000000006B02000-memory.dmp

Filesize
584KB

Download
memory/4076-3-0x0000000005870000-0x000000000590C000-memory.dmp

Filesize
624KB

Download
memory/4076-8-0x0000000074AB0000-0x0000000075260000-memory.dmp

Filesize
7.7MB

Download
memory/4076-2-0x0000000074AB0000-0x0000000075260000-memory.dmp

Filesize
7.7MB

Download
memory/4076-1-0x0000000000EB0000-0x0000000000EC2000-memory.dmp

Filesize
72KB

Download
memory/4076-0-0x0000000074ABE000-0x0000000074ABF000-memory.dmp

Filesize
4KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads