asyncrat | d59fcfd1f5fd871873d3f2d4de2c938825d8e49c7357da078cd7f4a3e42239bf

General

Target

d59fcfd1f5fd871873d3f2d4de2c938825d8e49c7357da078cd7f4a3e42239bf.exe
Size

76KB
MD5

7c41073a0f6d04187987594fe990242d
SHA1

8edb4897e61ff19c8fb1603b2713fb544ba97154
SHA256

d59fcfd1f5fd871873d3f2d4de2c938825d8e49c7357da078cd7f4a3e42239bf
SHA512

fa219e7ab70d78336c737cc16be57c4afbfde281f955eece644a13f27f860212323b2a8738c014bb4dc53ea85324e501f0c4b1dc56c8be4c3e980f87d694aeda
SSDEEP

1536:FuEYVTn8H2EMZGtUbbjXSVmw9gptdcjyGBvI+:FuE0Tn8H29kUbbjqytujyGt1

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

Default

C2

213.142.159.59:1605

Mutex

AsyncMutex_6SI8OkPnk

Attributes

delay
3
install
true
install_file
Windows Command Processor.exe
install_folder
%Temp%

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/0x000d000000012281-13.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2844	Windows Command Processor.exe

Loads dropped DLL 1 IoCs

pid	Process
2308	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	cmd.exe
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	Windows Command Processor.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	d59fcfd1f5fd871873d3f2d4de2c938825d8e49c7357da078cd7f4a3e42239bf.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2248	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
2512	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2556	d59fcfd1f5fd871873d3f2d4de2c938825d8e49c7357da078cd7f4a3e42239bf.exe
2556	d59fcfd1f5fd871873d3f2d4de2c938825d8e49c7357da078cd7f4a3e42239bf.exe
2556	d59fcfd1f5fd871873d3f2d4de2c938825d8e49c7357da078cd7f4a3e42239bf.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2556	d59fcfd1f5fd871873d3f2d4de2c938825d8e49c7357da078cd7f4a3e42239bf.exe
Token: SeDebugPrivilege	2844	Windows Command Processor.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 2556 wrote to memory of 2604	2556	d59fcfd1f5fd871873d3f2d4de2c938825d8e49c7357da078cd7f4a3e42239bf.exe	30
PID 2556 wrote to memory of 2604	2556	d59fcfd1f5fd871873d3f2d4de2c938825d8e49c7357da078cd7f4a3e42239bf.exe	30
PID 2556 wrote to memory of 2604	2556	d59fcfd1f5fd871873d3f2d4de2c938825d8e49c7357da078cd7f4a3e42239bf.exe	30
PID 2556 wrote to memory of 2604	2556	d59fcfd1f5fd871873d3f2d4de2c938825d8e49c7357da078cd7f4a3e42239bf.exe	30
PID 2556 wrote to memory of 2308	2556	d59fcfd1f5fd871873d3f2d4de2c938825d8e49c7357da078cd7f4a3e42239bf.exe	32
PID 2556 wrote to memory of 2308	2556	d59fcfd1f5fd871873d3f2d4de2c938825d8e49c7357da078cd7f4a3e42239bf.exe	32
PID 2556 wrote to memory of 2308	2556	d59fcfd1f5fd871873d3f2d4de2c938825d8e49c7357da078cd7f4a3e42239bf.exe	32
PID 2556 wrote to memory of 2308	2556	d59fcfd1f5fd871873d3f2d4de2c938825d8e49c7357da078cd7f4a3e42239bf.exe	32
PID 2604 wrote to memory of 2512	2604	cmd.exe	34
PID 2604 wrote to memory of 2512	2604	cmd.exe	34
PID 2604 wrote to memory of 2512	2604	cmd.exe	34
PID 2604 wrote to memory of 2512	2604	cmd.exe	34
PID 2308 wrote to memory of 2248	2308	cmd.exe	35
PID 2308 wrote to memory of 2248	2308	cmd.exe	35
PID 2308 wrote to memory of 2248	2308	cmd.exe	35
PID 2308 wrote to memory of 2248	2308	cmd.exe	35
PID 2308 wrote to memory of 2844	2308	cmd.exe	37
PID 2308 wrote to memory of 2844	2308	cmd.exe	37
PID 2308 wrote to memory of 2844	2308	cmd.exe	37
PID 2308 wrote to memory of 2844	2308	cmd.exe	37

C:\Users\Admin\AppData\Local\Temp\d59fcfd1f5fd871873d3f2d4de2c938825d8e49c7357da078cd7f4a3e42239bf.exe
"C:\Users\Admin\AppData\Local\Temp\d59fcfd1f5fd871873d3f2d4de2c938825d8e49c7357da078cd7f4a3e42239bf.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2556
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Windows Command Processor" /tr '"C:\Users\Admin\AppData\Local\Temp\Windows Command Processor.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2604
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "Windows Command Processor" /tr '"C:\Users\Admin\AppData\Local\Temp\Windows Command Processor.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2512
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpC15C.tmp.bat""
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2308
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2248
- - C:\Users\Admin\AppData\Local\Temp\Windows Command Processor.exe
    "C:\Users\Admin\AppData\Local\Temp\Windows Command Processor.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2844

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\tmpC15C.tmp.bat

Filesize
172B

MD5
e8156d00e0faaf1593ef29eee9cbcb4f

SHA1
0be906a7b743b56272d1ce81c7a1c1a9e9ab2668

SHA256
3228bea70b2269d1c79c89b555388f572b66f47d856016a7f9d926436851fb40

SHA512
a968cc9ec8dfd21424bae426bd2d50750d42a5896aac517237e3ec22766c797d789c8ad7e57b28378b5ae50dba560776872f6c507e846cc22ff20db2615d0675

Download Submit
\Users\Admin\AppData\Local\Temp\Windows Command Processor.exe

Filesize
76KB

MD5
7c41073a0f6d04187987594fe990242d

SHA1
8edb4897e61ff19c8fb1603b2713fb544ba97154

SHA256
d59fcfd1f5fd871873d3f2d4de2c938825d8e49c7357da078cd7f4a3e42239bf

SHA512
fa219e7ab70d78336c737cc16be57c4afbfde281f955eece644a13f27f860212323b2a8738c014bb4dc53ea85324e501f0c4b1dc56c8be4c3e980f87d694aeda

Download Submit
memory/2556-0-0x000000007423E000-0x000000007423F000-memory.dmp

Filesize
4KB

Download
memory/2556-1-0x0000000000CA0000-0x0000000000CBA000-memory.dmp

Filesize
104KB

Download
memory/2556-2-0x0000000074230000-0x000000007491E000-memory.dmp

Filesize
6.9MB

Download
memory/2556-12-0x0000000074230000-0x000000007491E000-memory.dmp

Filesize
6.9MB

Download
memory/2844-16-0x0000000000B40000-0x0000000000B5A000-memory.dmp

Filesize
104KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads