asyncrat | 1659db1c128cc72c1d5db8ec73a93cc89cc684f00a4c2b83b76fef32af45fe07

General

Target

PetSim99GUI.exe
Size

48KB
MD5

f5fa1fb705307bd25ca0d0408b8d6684
SHA1

31dffff48303612d94d4c10083ade7c6b3b777a3
SHA256

1659db1c128cc72c1d5db8ec73a93cc89cc684f00a4c2b83b76fef32af45fe07
SHA512

a2803bf7b0662893c1bbc5f2bf876690e57fbf611225cfd968cd04d9c3a005b3d71b27e2df8003ddfa2fcf353691957ea27b119dad88073f8adc9d5114abd246
SSDEEP

768:OugvNTjgkH7F7WUHF9pmo2q7cJ/IP8Xjog1VPI0HgmP0i0bc64EU7XoEFmSwBqRb:OugvNTcIb2te3gE0H6dbcjE+z5vdzH

Score

10^/10

asyncrat default discovery evasion rat spyware stealer trojan

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

letsgetdigging.hopto.org:6606

Mutex

gwp6EO1O6Isj

Attributes

delay
3
install
true
install_file
PS99.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

Modifies Windows Defender Real-time Protection settings 3 TTPs 4 IoCs

evasion trojan

Modify Registry

T1112

Windows Service

T1543.003

Disable or Modify Tools

T1562.001

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection	PS99.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1"	PS99.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1"	PS99.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1"	PS99.exe

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral1/files/0x000d000000012261-13.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2460	PS99.exe

Loads dropped DLL 1 IoCs

pid	Process
2692	cmd.exe

Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003

Windows security modification 2 TTPs 2 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\Features	PS99.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	PS99.exe

Drops desktop.ini file(s) 1 IoCs

description	ioc	Process
File opened for modification	\??\c:\users\admin\desktop\desktop.ini	PS99.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 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	PetSim99GUI.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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PS99.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2824	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 4 IoCs

pid	Process
2400	PetSim99GUI.exe
2400	PetSim99GUI.exe
2400	PetSim99GUI.exe
3932	powershell.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	2400	PetSim99GUI.exe
Token: SeDebugPrivilege	2460	PS99.exe
Token: SeDebugPrivilege	2460	PS99.exe
Token: SeDebugPrivilege	3932	powershell.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 2400 wrote to memory of 2772	2400	PetSim99GUI.exe	31
PID 2400 wrote to memory of 2772	2400	PetSim99GUI.exe	31
PID 2400 wrote to memory of 2772	2400	PetSim99GUI.exe	31
PID 2400 wrote to memory of 2772	2400	PetSim99GUI.exe	31
PID 2400 wrote to memory of 2692	2400	PetSim99GUI.exe	33
PID 2400 wrote to memory of 2692	2400	PetSim99GUI.exe	33
PID 2400 wrote to memory of 2692	2400	PetSim99GUI.exe	33
PID 2400 wrote to memory of 2692	2400	PetSim99GUI.exe	33
PID 2772 wrote to memory of 2796	2772	cmd.exe	35
PID 2772 wrote to memory of 2796	2772	cmd.exe	35
PID 2772 wrote to memory of 2796	2772	cmd.exe	35
PID 2772 wrote to memory of 2796	2772	cmd.exe	35
PID 2692 wrote to memory of 2824	2692	cmd.exe	36
PID 2692 wrote to memory of 2824	2692	cmd.exe	36
PID 2692 wrote to memory of 2824	2692	cmd.exe	36
PID 2692 wrote to memory of 2824	2692	cmd.exe	36
PID 2692 wrote to memory of 2460	2692	cmd.exe	37
PID 2692 wrote to memory of 2460	2692	cmd.exe	37
PID 2692 wrote to memory of 2460	2692	cmd.exe	37
PID 2692 wrote to memory of 2460	2692	cmd.exe	37
PID 2460 wrote to memory of 3932	2460	PS99.exe	39
PID 2460 wrote to memory of 3932	2460	PS99.exe	39
PID 2460 wrote to memory of 3932	2460	PS99.exe	39
PID 2460 wrote to memory of 3932	2460	PS99.exe	39

C:\Users\Admin\AppData\Local\Temp\PetSim99GUI.exe
"C:\Users\Admin\AppData\Local\Temp\PetSim99GUI.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2400
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "PS99" /tr '"C:\Users\Admin\AppData\Roaming\PS99.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2772
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "PS99" /tr '"C:\Users\Admin\AppData\Roaming\PS99.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\tmp8EB8.tmp.bat""
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2692
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2824
- - C:\Users\Admin\AppData\Roaming\PS99.exe
    "C:\Users\Admin\AppData\Roaming\PS99.exe"
    3⤵
    - Modifies Windows Defender Real-time Protection settings
    - Executes dropped EXE
    - Windows security modification
    - Drops desktop.ini file(s)
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:2460
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "powershell" Get-MpPreference -verbose
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:3932

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Create or Modify System Process

1

T1543

Windows Service

1

T1543.003

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Create or Modify System Process

1

T1543

Windows Service

1

T1543.003

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Impair Defenses

2

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\CabAC19.tmp

Filesize
70KB

MD5
49aebf8cbd62d92ac215b2923fb1b9f5

SHA1
1723be06719828dda65ad804298d0431f6aff976

SHA256
b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f

SHA512
bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

Download Submit
C:\Users\Admin\AppData\Local\Temp\Tar1818.tmp

Filesize
181KB

MD5
4ea6026cf93ec6338144661bf1202cd1

SHA1
a1dec9044f750ad887935a01430bf49322fbdcb7

SHA256
8efbc21559ef8b1bcf526800d8070baad42474ce7198e26fa771dbb41a76b1d8

SHA512
6c7e0980e39aacf4c3689802353f464a08cd17753bd210ee997e5f2a455deb4f287a9ef74d84579dbde49bc96213cd2b8b247723919c412ea980aa6e6bfe218b

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp8EB8.tmp.bat

Filesize
148B

MD5
ec451813d56ffc8ec164c33e7113a478

SHA1
f5236d2c4e82ffea64d01ac033b4bf1699a20749

SHA256
f674672b43a7c6ba2588590f3ae7c522d5be05f0ff1eb556928fa5c961734641

SHA512
630ad8b2fe085d324a38a3163883f2f3776cf17d5b76867bb7b8b52f9d178af913428bcd830943f2db9819346272280c4ff209004b0a6101c7004f7c89a1b33e

Download Submit
\Users\Admin\AppData\Roaming\PS99.exe

Filesize
48KB

MD5
f5fa1fb705307bd25ca0d0408b8d6684

SHA1
31dffff48303612d94d4c10083ade7c6b3b777a3

SHA256
1659db1c128cc72c1d5db8ec73a93cc89cc684f00a4c2b83b76fef32af45fe07

SHA512
a2803bf7b0662893c1bbc5f2bf876690e57fbf611225cfd968cd04d9c3a005b3d71b27e2df8003ddfa2fcf353691957ea27b119dad88073f8adc9d5114abd246

Download Submit
memory/2400-0-0x00000000746CE000-0x00000000746CF000-memory.dmp

Filesize
4KB

Download
memory/2400-11-0x00000000746C0000-0x0000000074DAE000-memory.dmp

Filesize
6.9MB

Download
memory/2400-2-0x00000000746C0000-0x0000000074DAE000-memory.dmp

Filesize
6.9MB

Download
memory/2400-1-0x0000000000890000-0x00000000008A2000-memory.dmp

Filesize
72KB

Download
memory/2460-16-0x0000000000150000-0x0000000000162000-memory.dmp

Filesize
72KB

Download
memory/2460-33-0x00000000066D0000-0x000000000676C000-memory.dmp

Filesize
624KB

Download
memory/2460-52-0x0000000001E50000-0x0000000001E90000-memory.dmp

Filesize
256KB

Download
memory/2460-53-0x0000000001DE0000-0x0000000001DEA000-memory.dmp

Filesize
40KB

Download
memory/2460-54-0x00000000059C0000-0x0000000005A28000-memory.dmp

Filesize
416KB

Download
memory/2460-73-0x0000000005BD0000-0x0000000005C38000-memory.dmp

Filesize
416KB

Download
memory/2460-94-0x0000000006090000-0x00000000060F4000-memory.dmp

Filesize
400KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads