asyncrat | fdbd05244fb6870c13022d4a093d7ec5697cfafbf60f985b7ae3cca978c7c3db

General

Target

AsyncClient.exe
Size

45KB
MD5

00f183535e5d84f0b288b78f9fb8acfd
SHA1

bae870d2a4eb3beb910a5e61a29d5424ac9e1f46
SHA256

fdbd05244fb6870c13022d4a093d7ec5697cfafbf60f985b7ae3cca978c7c3db
SHA512

419a2da231e83102d77542cede8424830b7a5b8de5f58ae291f6dd8005c5b87050fc966ddb1de6b990d3ea1d88ea3dd2ba835420682bf0f110515c0374289e2c
SSDEEP

768:ZuiHNTdFHLBWUZzGrmo2qrgKjPGaG6PIyzjbFgX3ied7N+eUqA+3BDZrx:ZuiHNTdB+25KTkDy3bCXSed0qDxdrx

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

192.168.0.174:8808

192.168.0.174:31360

wooff-42169.portmap.host:31360:8808

wooff-42169.portmap.host:31360:31360

wooff-42169.portmap.host:8808

wooff-42169.portmap.host:31360

Mutex

WjV4Z2ndPKB4

Attributes

delay
3
install
true
install_file
dad.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/files/0x0008000000012102-13.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
1656	dad.exe

Loads dropped DLL 1 IoCs

pid	Process
1224	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	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	dad.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AsyncClient.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	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2672	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
2620	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2756	AsyncClient.exe
2756	AsyncClient.exe
2756	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2756	AsyncClient.exe
Token: SeDebugPrivilege	1656	dad.exe
Token: SeDebugPrivilege	1656	dad.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 2756 wrote to memory of 2964	2756	AsyncClient.exe	31
PID 2756 wrote to memory of 2964	2756	AsyncClient.exe	31
PID 2756 wrote to memory of 2964	2756	AsyncClient.exe	31
PID 2756 wrote to memory of 2964	2756	AsyncClient.exe	31
PID 2756 wrote to memory of 1224	2756	AsyncClient.exe	33
PID 2756 wrote to memory of 1224	2756	AsyncClient.exe	33
PID 2756 wrote to memory of 1224	2756	AsyncClient.exe	33
PID 2756 wrote to memory of 1224	2756	AsyncClient.exe	33
PID 2964 wrote to memory of 2620	2964	cmd.exe	35
PID 2964 wrote to memory of 2620	2964	cmd.exe	35
PID 2964 wrote to memory of 2620	2964	cmd.exe	35
PID 2964 wrote to memory of 2620	2964	cmd.exe	35
PID 1224 wrote to memory of 2672	1224	cmd.exe	36
PID 1224 wrote to memory of 2672	1224	cmd.exe	36
PID 1224 wrote to memory of 2672	1224	cmd.exe	36
PID 1224 wrote to memory of 2672	1224	cmd.exe	36
PID 1224 wrote to memory of 1656	1224	cmd.exe	37
PID 1224 wrote to memory of 1656	1224	cmd.exe	37
PID 1224 wrote to memory of 1656	1224	cmd.exe	37
PID 1224 wrote to memory of 1656	1224	cmd.exe	37

C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe
"C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2756
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "dad" /tr '"C:\Users\Admin\AppData\Roaming\dad.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2964
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "dad" /tr '"C:\Users\Admin\AppData\Roaming\dad.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2620
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp7FBB.tmp.bat""
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1224
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2672
- - C:\Users\Admin\AppData\Roaming\dad.exe
    "C:\Users\Admin\AppData\Roaming\dad.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:1656

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\tmp7FBB.tmp.bat

Filesize
147B

MD5
d70d2302aa018cf1cb6a6ec5a2a059d0

SHA1
faab3b5976d68f57249a7a0cbbc68c5db1d44fec

SHA256
95ed4bf53af9da9e0e8272a358aa2265a1bc04bcdd485a7c4cf7558a75127ccf

SHA512
77ea6bff6245bf372d3cbb886c9cd824d6aed412c0402cff8aec3342502c87ceae18b2fcbc588fd6ffd7f7f19dde9d4beaf0352fa65378e3886d77ee34c7688c

Download Submit
\Users\Admin\AppData\Roaming\dad.exe

Filesize
45KB

MD5
00f183535e5d84f0b288b78f9fb8acfd

SHA1
bae870d2a4eb3beb910a5e61a29d5424ac9e1f46

SHA256
fdbd05244fb6870c13022d4a093d7ec5697cfafbf60f985b7ae3cca978c7c3db

SHA512
419a2da231e83102d77542cede8424830b7a5b8de5f58ae291f6dd8005c5b87050fc966ddb1de6b990d3ea1d88ea3dd2ba835420682bf0f110515c0374289e2c

Download Submit
memory/1656-16-0x0000000000DE0000-0x0000000000DF2000-memory.dmp

Filesize
72KB

Download
memory/2756-0-0x0000000074AEE000-0x0000000074AEF000-memory.dmp

Filesize
4KB

Download
memory/2756-1-0x00000000002D0000-0x00000000002E2000-memory.dmp

Filesize
72KB

Download
memory/2756-2-0x0000000074AE0000-0x00000000751CE000-memory.dmp

Filesize
6.9MB

Download
memory/2756-11-0x0000000074AE0000-0x00000000751CE000-memory.dmp

Filesize
6.9MB

Download

Resubmissions

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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