asyncrat | 6c53547194ba58fd3ce619bd1e68d897b90973386c26c77216c2027c0278ca9c

General

Target
C2Malware.exe
Size 56KB
Sample261002-hwpwvsxtet
SHA256 6c53547194ba58fd3ce619bd1e68d897b90973386c26c77216c2027c0278ca9c
MD5 845d10238ba3d99fd65042c0e04726fb
SHA1 7c343752dcc6da34f84c39b109266aaa1ef4c45a
SHA512 ca33ee81e2e126096cf9a47b511006b96dab0803f88f4c6b2166fb7147c801b2c2174d30b256c7a027fce69d8e1c56cbeca9295154edd26113b661e18d1a0c4b
SSDEEP 1536:2uf09TH2w24RAPYIN3bnXSLl5AB5sufdNkejNUHLTq:2ufoTH2w2VYIN3bndPsmDkINmq
TLSH
T18A436C003BE9822BF1BE5FB8ACF21144467AF2676603D95D1CC4518B5713BC6DA42AFE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

default defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

88win.lat:443
88win.lat:8848
88win.lat:8080

Mutex

kBVPjakHQ19X

Attributes

delay
3
install
true
install_file
AsyncRat.exe
install_folder
%AppData%

aes.plain

Signatures

Family: AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral1/files/0x000500000001da69-8.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-1-5-21-524788801-3318743092-4051225893-1000\Control Panel\International\Geo\Nation	C2Malware.exe

Executes dropped EXE 2 IoCs

pid	Process
2588	AsyncRat.exe
1224	AsyncRat.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Executes a command shell one-liner 1 TTPs 2 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
4832	cmd.exe
2612	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	AsyncRat.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	AsyncRat.exe

System Location Discovery: System Language Discovery 1 TTPs 7 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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AsyncRat.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AsyncRat.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	C2Malware.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
4464	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
1308	schtasks.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

pid	Process
4736	C2Malware.exe
4736	C2Malware.exe
4736	C2Malware.exe
4736	C2Malware.exe
4736	C2Malware.exe
4736	C2Malware.exe
4736	C2Malware.exe
4736	C2Malware.exe
4736	C2Malware.exe
4736	C2Malware.exe
4736	C2Malware.exe
4736	C2Malware.exe
4736	C2Malware.exe
4736	C2Malware.exe
4736	C2Malware.exe
4736	C2Malware.exe
4736	C2Malware.exe
4736	C2Malware.exe
4736	C2Malware.exe
4736	C2Malware.exe
4736	C2Malware.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4736	C2Malware.exe
Token: SeDebugPrivilege	2588	AsyncRat.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4736 wrote to memory of 2612	4736	C2Malware.exe	95
PID 4736 wrote to memory of 4832	4736	C2Malware.exe	97
PID 4832 wrote to memory of 4464	4832	cmd.exe	99
PID 2612 wrote to memory of 1308	2612	cmd.exe	100
PID 4832 wrote to memory of 1224	4832	cmd.exe	104

C:\Users\Admin\AppData\Local\Temp\C2Malware.exe
"C:\Users\Admin\AppData\Local\Temp\C2Malware.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4736
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "AsyncRat" /tr '"C:\Users\Admin\AppData\Roaming\AsyncRat.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2612
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "AsyncRat" /tr '"C:\Users\Admin\AppData\Roaming\AsyncRat.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1308
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp70B6.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4832
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:4464
- - C:\Users\Admin\AppData\Roaming\AsyncRat.exe
    "C:\Users\Admin\AppData\Roaming\AsyncRat.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:1224

C:\Users\Admin\AppData\Roaming\AsyncRat.exe
"C:\Users\Admin\AppData\Roaming\AsyncRat.exe"
1⤵
- Executes dropped EXE
- Reads the TCP/IP host and domain name from the registry
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:2588

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

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

System Network Configuration Discovery

1

T1016

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

tmp70B6.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp70B6.tmp.bat
Size 152B
SHA256 0ef8225b462b5bd3db119da58db87387ccab5f5cdd5e933ebf8c5a877d3af90c
MD5 1b642e2ff1802f5eaaa64f30f28b830e
SHA1 fc311059abd71d5f2b8d5f4e7a20f83fff1a0ebd
SHA512 778c2d10d751fad63ac6ecd33f8cf05317686717b7dd9168e452f6baed876baff9a7e8555ac85c589aebacf537f7feadd82e72c62ae74aabce0728a5e00d5243
TLSH
T1D1C08C4292C5AB1E2C09341312BA988C95666C593E40AB40C30844A9968054CF4A9245
MD5 SHA1 SHA512 TLSH

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AsyncRat.exe

Path C:\Users\Admin\AppData\Roaming\AsyncRat.exe
Size 56KB
SHA256 6c53547194ba58fd3ce619bd1e68d897b90973386c26c77216c2027c0278ca9c
MD5 845d10238ba3d99fd65042c0e04726fb
SHA1 7c343752dcc6da34f84c39b109266aaa1ef4c45a
SHA512 ca33ee81e2e126096cf9a47b511006b96dab0803f88f4c6b2166fb7147c801b2c2174d30b256c7a027fce69d8e1c56cbeca9295154edd26113b661e18d1a0c4b
SSDEEP 1536:2uf09TH2w24RAPYIN3bnXSLl5AB5sufdNkejNUHLTq:2ufoTH2w2VYIN3bndPsmDkINmq
TLSH
T18A436C003BE9822BF1BE5FB8ACF21144467AF2676603D95D1CC4518B5713BC6DA42AFE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4736-0-0x0000000000570000-0x0000000000584000-memory.dmp

Download

memory/4736-1-0x0000000004FF0000-0x0000000005000000-memory.dmp

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memory/4736-2-0x0000000005000000-0x000000000509C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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