asyncrat | 47bcb7f1a4b0ff298324a6121acdbb739820aca4aca1289094134e9681895e61

Reason

Machine shutdown

General

Target

AsyncClient test.exe
Size

79KB
MD5

a29f945c15c3187b7b890f89c3b6cb49
SHA1

0b9e9ed0f6807475dbbff87542eac10286b33945
SHA256

47bcb7f1a4b0ff298324a6121acdbb739820aca4aca1289094134e9681895e61
SHA512

4c44982e5a5c142cf2a9226f86c39098f4c42f7d873af747a8ede4ca2dba9334ee6f53abf95984e7b5fa836bba91d4a38d68f447281db8d1b7062097068d910c
SSDEEP

1536:RuYH9T34y2e2QUbcHSSVQDbGIzfp3OY7NdWmW:RuYdT34y2e2QUbcyNbGIzx3l7NfW

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

Mutex

0ZOg4qZ0tD2Z

Attributes

delay
3
install
true
install_file
TEST.exe
install_folder
%AppData%
pastebin_config
https://pastebin.com/raw/s14cUU5G

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
behavioral2/files/0x000300000001e6a6-12.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-1-5-21-2412658365-3084825385-3340777666-1000\Control Panel\International\Geo\Nation	AsyncClient test.exe

Executes dropped EXE 1 IoCs

pid	Process
1928	TEST.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
17	pastebin.com
18	pastebin.com

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	AsyncClient test.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	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	TEST.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
4236	timeout.exe

Modifies data under HKEY_USERS 15 IoCs

description	ioc	Process
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\AccentColor = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationGlassAttribute = "1"	LogonUI.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentPalette = a6d8ff0076b9ed00429ce3000078d700005a9e000042750000264200f7630c00	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColorBalance = "89"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "126"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentColorMenu = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglow = "3288365271"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglowBalance = "10"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationBlurBalance = "1"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History\AutoColor = "0"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\StartColorMenu = "4288567808"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColor = "3288365271"	LogonUI.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
640	schtasks.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

pid	Process
4084	AsyncClient test.exe
4084	AsyncClient test.exe
4084	AsyncClient test.exe
4084	AsyncClient test.exe
4084	AsyncClient test.exe
4084	AsyncClient test.exe
4084	AsyncClient test.exe
4084	AsyncClient test.exe
4084	AsyncClient test.exe
4084	AsyncClient test.exe
4084	AsyncClient test.exe
4084	AsyncClient test.exe
4084	AsyncClient test.exe
4084	AsyncClient test.exe
4084	AsyncClient test.exe
4084	AsyncClient test.exe
4084	AsyncClient test.exe
4084	AsyncClient test.exe
4084	AsyncClient test.exe
4084	AsyncClient test.exe
4084	AsyncClient test.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4084	AsyncClient test.exe
Token: SeDebugPrivilege	1928	TEST.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2988	LogonUI.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4084 wrote to memory of 1284	4084	AsyncClient test.exe	90
PID 4084 wrote to memory of 1284	4084	AsyncClient test.exe	90
PID 4084 wrote to memory of 1284	4084	AsyncClient test.exe	90
PID 4084 wrote to memory of 3104	4084	AsyncClient test.exe	92
PID 4084 wrote to memory of 3104	4084	AsyncClient test.exe	92
PID 4084 wrote to memory of 3104	4084	AsyncClient test.exe	92
PID 3104 wrote to memory of 4236	3104	cmd.exe	94
PID 3104 wrote to memory of 4236	3104	cmd.exe	94
PID 3104 wrote to memory of 4236	3104	cmd.exe	94
PID 1284 wrote to memory of 640	1284	cmd.exe	95
PID 1284 wrote to memory of 640	1284	cmd.exe	95
PID 1284 wrote to memory of 640	1284	cmd.exe	95
PID 3104 wrote to memory of 1928	3104	cmd.exe	96
PID 3104 wrote to memory of 1928	3104	cmd.exe	96
PID 3104 wrote to memory of 1928	3104	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\AsyncClient test.exe
"C:\Users\Admin\AppData\Local\Temp\AsyncClient test.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4084
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "TEST" /tr '"C:\Users\Admin\AppData\Roaming\TEST.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1284
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "TEST" /tr '"C:\Users\Admin\AppData\Roaming\TEST.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:640
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpC861.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3104
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:4236
- - C:\Users\Admin\AppData\Roaming\TEST.exe
    "C:\Users\Admin\AppData\Roaming\TEST.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:1928

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x4 /state0:0xa394d855 /state1:0x41c64e6d
1⤵
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:2988

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

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpC861.tmp.bat

Filesize
148B

MD5
f5c627cb1d68b6e708b66f64c8dc4211

SHA1
2b5b83fb864180e27fbdbf27f41f8548411e410e

SHA256
58270e8c7aeebbb031e94a2a04c8c39be859eb9b6a12d92baac373a457b695fb

SHA512
446147ce0623132de83bfbab90c687b02445f392c320da7f22972dbaf0371d7b43b42fd6879c9772d2a07222e34a970df92a1974df5b06df3601869ed53b8752

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

Filesize
79KB

MD5
a29f945c15c3187b7b890f89c3b6cb49

SHA1
0b9e9ed0f6807475dbbff87542eac10286b33945

SHA256
47bcb7f1a4b0ff298324a6121acdbb739820aca4aca1289094134e9681895e61

SHA512
4c44982e5a5c142cf2a9226f86c39098f4c42f7d873af747a8ede4ca2dba9334ee6f53abf95984e7b5fa836bba91d4a38d68f447281db8d1b7062097068d910c

Download Submit
memory/1928-14-0x0000000074F70000-0x0000000075720000-memory.dmp

Filesize
7.7MB

Download
memory/1928-15-0x0000000074F70000-0x0000000075720000-memory.dmp

Filesize
7.7MB

Download
memory/1928-16-0x0000000074F70000-0x0000000075720000-memory.dmp

Filesize
7.7MB

Download
memory/4084-0-0x000000007501E000-0x000000007501F000-memory.dmp

Filesize
4KB

Download
memory/4084-1-0x0000000000150000-0x000000000016A000-memory.dmp

Filesize
104KB

Download
memory/4084-2-0x0000000075010000-0x00000000757C0000-memory.dmp

Filesize
7.7MB

Download
memory/4084-3-0x0000000004AF0000-0x0000000004B56000-memory.dmp

Filesize
408KB

Download
memory/4084-4-0x0000000004F40000-0x0000000004FDC000-memory.dmp

Filesize
624KB

Download
memory/4084-9-0x0000000075010000-0x00000000757C0000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

Errors

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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