asyncrat | 828ba73d572808c7a5b1446c74aac88f12783993c77ced5f448a4d013d5af5ba

General

Target

kkkk.exe
Size

47KB
MD5

1d7a26fbb453cc6d2e7d043b78e35a20
SHA1

09f126416801d34bbb810f31177d85af47d7e6e3
SHA256

828ba73d572808c7a5b1446c74aac88f12783993c77ced5f448a4d013d5af5ba
SHA512

a5c7406b72a12c0e1fba41ab7860298c32c46316c614b7f6362006fa592ca014753211fee1075436080cb1ed08eaef43aefbb6e3d982827e4eed00f8954987ea
SSDEEP

768:Juk0VT3ongoWU2Gjimo2qrZwC9VsFtePIpk6Z/0bCwAL48IESVGmitVzcWIVgCt1:Juk0VT3Q+2GVsFtpkOcbCwAIVjitVzcp

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

127.0.0.1:7707

127.0.0.1:8808

Mutex

O0LOqrCJA4pL

Attributes

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

aes.plain

Signatures

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/0x000c000000023408-11.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-1-5-21-4182098368-2521458979-3782681353-1000\Control Panel\International\Geo\Nation	kkkk.exe

Executes dropped EXE 1 IoCs

pid	Process
1460	hey.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	hey.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	kkkk.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
3432	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
4588	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
1868	kkkk.exe
1868	kkkk.exe
1868	kkkk.exe
1868	kkkk.exe
1868	kkkk.exe
1868	kkkk.exe
1868	kkkk.exe
1868	kkkk.exe
1868	kkkk.exe
1868	kkkk.exe
1868	kkkk.exe
1868	kkkk.exe
1868	kkkk.exe
1868	kkkk.exe
1868	kkkk.exe
1868	kkkk.exe
1868	kkkk.exe
1868	kkkk.exe
1868	kkkk.exe
1868	kkkk.exe
1868	kkkk.exe
1868	kkkk.exe
1868	kkkk.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1868	kkkk.exe
Token: SeDebugPrivilege	1460	hey.exe
Token: SeDebugPrivilege	1460	hey.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1868 wrote to memory of 2736	1868	kkkk.exe	92
PID 1868 wrote to memory of 2736	1868	kkkk.exe	92
PID 1868 wrote to memory of 2736	1868	kkkk.exe	92
PID 1868 wrote to memory of 4052	1868	kkkk.exe	94
PID 1868 wrote to memory of 4052	1868	kkkk.exe	94
PID 1868 wrote to memory of 4052	1868	kkkk.exe	94
PID 2736 wrote to memory of 4588	2736	cmd.exe	96
PID 2736 wrote to memory of 4588	2736	cmd.exe	96
PID 2736 wrote to memory of 4588	2736	cmd.exe	96
PID 4052 wrote to memory of 3432	4052	cmd.exe	97
PID 4052 wrote to memory of 3432	4052	cmd.exe	97
PID 4052 wrote to memory of 3432	4052	cmd.exe	97
PID 4052 wrote to memory of 1460	4052	cmd.exe	99
PID 4052 wrote to memory of 1460	4052	cmd.exe	99
PID 4052 wrote to memory of 1460	4052	cmd.exe	99

C:\Users\Admin\AppData\Local\Temp\kkkk.exe
"C:\Users\Admin\AppData\Local\Temp\kkkk.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1868
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "hey" /tr '"C:\Users\Admin\AppData\Roaming\hey.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2736
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "hey" /tr '"C:\Users\Admin\AppData\Roaming\hey.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:4588
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpCDEF.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4052
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:3432
- - C:\Users\Admin\AppData\Roaming\hey.exe
    "C:\Users\Admin\AppData\Roaming\hey.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:1460

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\tmpCDEF.tmp.bat

Filesize
147B

MD5
102c87adcfd6f4aee77dc100a96074e6

SHA1
510d4181fc130a95ac1f663c718eea440d1dcf33

SHA256
6906b0bed39fe8962cb954e747083581a4ca1f4f4b21b9c72a28ec602ba5819e

SHA512
34cf38185ae2a481a38f1ec73ede39d32ae527640f49b97788c471ab1a24c6a7629a39bd65536da579d779413aa2a65316e9051d7405556786348b9a6b7ad455

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

Filesize
47KB

MD5
1d7a26fbb453cc6d2e7d043b78e35a20

SHA1
09f126416801d34bbb810f31177d85af47d7e6e3

SHA256
828ba73d572808c7a5b1446c74aac88f12783993c77ced5f448a4d013d5af5ba

SHA512
a5c7406b72a12c0e1fba41ab7860298c32c46316c614b7f6362006fa592ca014753211fee1075436080cb1ed08eaef43aefbb6e3d982827e4eed00f8954987ea

Download Submit
memory/1460-13-0x0000000074960000-0x0000000075110000-memory.dmp

Filesize
7.7MB

Download
memory/1460-14-0x0000000074960000-0x0000000075110000-memory.dmp

Filesize
7.7MB

Download
memory/1868-0-0x0000000074A1E000-0x0000000074A1F000-memory.dmp

Filesize
4KB

Download
memory/1868-1-0x0000000000200000-0x0000000000212000-memory.dmp

Filesize
72KB

Download
memory/1868-2-0x0000000074A10000-0x00000000751C0000-memory.dmp

Filesize
7.7MB

Download
memory/1868-3-0x0000000004BD0000-0x0000000004C6C000-memory.dmp

Filesize
624KB

Download
memory/1868-8-0x0000000074A10000-0x00000000751C0000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads