asyncrat | a31527ac5e1df418a9ee25b623ad730c44e18b4b62aa6e649bb6e5fd9e0088f5

General

Target

..exe
Size

145KB
MD5

a55e72b66a2767fa68ae713250ff0b21
SHA1

550d1c5ef3c23cc59392ea24c67f4f43669cecef
SHA256

a31527ac5e1df418a9ee25b623ad730c44e18b4b62aa6e649bb6e5fd9e0088f5
SHA512

cb47663be048c07c6e9e6387946a512f0435be1a4034a5ee2549025b70cd4c5868bfba0ea3e76af0700492f1c8dc388f83e0c7f37ac64011ed2eaca06daef1d2
SSDEEP

3072:VuIJT8kD2gEdIOcYgb8GHOxk0y+Bz65/M6If+3Js+3JFkKeTnYx:VuITSzCOPgbmyMxBt25v

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

192.168.0.174:8808

Mutex

ejrY4UrkOJwj

Attributes

delay
3
install
true
install_file
System Handler.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/0x000f000000012782-13.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2204	System Handler.exe

Loads dropped DLL 1 IoCs

pid	Process
2684	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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	System Handler.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	..exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2852	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
2796	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
1292	..exe
1292	..exe
1292	..exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1292	..exe
Token: SeDebugPrivilege	2204	System Handler.exe
Token: SeDebugPrivilege	2204	System Handler.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 1292 wrote to memory of 2624	1292	..exe	32
PID 1292 wrote to memory of 2624	1292	..exe	32
PID 1292 wrote to memory of 2624	1292	..exe	32
PID 1292 wrote to memory of 2624	1292	..exe	32
PID 1292 wrote to memory of 2684	1292	..exe	34
PID 1292 wrote to memory of 2684	1292	..exe	34
PID 1292 wrote to memory of 2684	1292	..exe	34
PID 1292 wrote to memory of 2684	1292	..exe	34
PID 2624 wrote to memory of 2796	2624	cmd.exe	37
PID 2624 wrote to memory of 2796	2624	cmd.exe	37
PID 2624 wrote to memory of 2796	2624	cmd.exe	37
PID 2624 wrote to memory of 2796	2624	cmd.exe	37
PID 2684 wrote to memory of 2852	2684	cmd.exe	36
PID 2684 wrote to memory of 2852	2684	cmd.exe	36
PID 2684 wrote to memory of 2852	2684	cmd.exe	36
PID 2684 wrote to memory of 2852	2684	cmd.exe	36
PID 2684 wrote to memory of 2204	2684	cmd.exe	38
PID 2684 wrote to memory of 2204	2684	cmd.exe	38
PID 2684 wrote to memory of 2204	2684	cmd.exe	38
PID 2684 wrote to memory of 2204	2684	cmd.exe	38

C:\Users\Admin\AppData\Local\Temp\..exe
"C:\Users\Admin\AppData\Local\Temp\..exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1292
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "System Handler" /tr '"C:\Users\Admin\AppData\Roaming\System Handler.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2624
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "System Handler" /tr '"C:\Users\Admin\AppData\Roaming\System Handler.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2796
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpE698.tmp.bat""
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2684
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2852
- - C:\Users\Admin\AppData\Roaming\System Handler.exe
    "C:\Users\Admin\AppData\Roaming\System Handler.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2204

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\tmpE698.tmp.bat

Filesize
158B

MD5
e39809a7abafc5c658ef2591628ee19e

SHA1
c6b638a62a6c19d3cebfa6ce88076c50d82e8627

SHA256
7995eb44177f4f1aa4ed65b35d00cf9088960d16c26272982313bc0e124518d4

SHA512
bb840b7b62f9932089f0528c92f9e7888bd5937a6ddda7475fae0c198ee572b4b74113cbf54b669d3ba9f18e03c8f2cd6783e61ac04a9fffdcda93d81b3b336d

Download Submit
\Users\Admin\AppData\Roaming\System Handler.exe

Filesize
145KB

MD5
a55e72b66a2767fa68ae713250ff0b21

SHA1
550d1c5ef3c23cc59392ea24c67f4f43669cecef

SHA256
a31527ac5e1df418a9ee25b623ad730c44e18b4b62aa6e649bb6e5fd9e0088f5

SHA512
cb47663be048c07c6e9e6387946a512f0435be1a4034a5ee2549025b70cd4c5868bfba0ea3e76af0700492f1c8dc388f83e0c7f37ac64011ed2eaca06daef1d2

Download Submit
memory/1292-0-0x00000000744DE000-0x00000000744DF000-memory.dmp

Filesize
4KB

Download
memory/1292-1-0x0000000000E10000-0x0000000000E3A000-memory.dmp

Filesize
168KB

Download
memory/1292-2-0x00000000744D0000-0x0000000074BBE000-memory.dmp

Filesize
6.9MB

Download
memory/1292-11-0x00000000744D0000-0x0000000074BBE000-memory.dmp

Filesize
6.9MB

Download
memory/2204-16-0x0000000000C10000-0x0000000000C3A000-memory.dmp

Filesize
168KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads