asyncrat | 8f6baf69e7e047012b20299cd4d3bf4f86eaee8c7f42fed6cb4a33b79ef51dd2

Analysis

max time kernel
121s
max time network
123s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
11-11-2024 13:34

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General

Target

SunlightBootstrapper.exe
Size

1.8MB
MD5

7c4f1852448b6217ca92deecaceb6247
SHA1

23f8b47a3a5bbcadb7d01dd8a727e0c2c48c0848
SHA256

8f6baf69e7e047012b20299cd4d3bf4f86eaee8c7f42fed6cb4a33b79ef51dd2
SHA512

4ef4281529f2159761f11ad890da0f7d79e2513019a1fd717b312ef2fb0ef9d01a54cb07561e40b0c12edd46089a8228f977ebb2ac109939bdddda57fad2f812
SSDEEP

24576:dsmUYlIZ2RBbEeUhk7Dz6rdnkYA1LUqBFJJCZm4E6+eQ:emUYlIckeUAGnmLtFaZ0pe

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

109.87.212.225:1337

Mutex

oIyMus9FxRxA

Attributes

delay
3
install
true
install_file
dwm.exe
install_folder
%Temp%

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/0x00080000000173fb-8.dat	family_asyncrat

Executes dropped EXE 2 IoCs

pid	Process
2384	tmpA093.tmp.com
2636	dwm.exe

Loads dropped DLL 1 IoCs

pid	Process
2964	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 10 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	tmpA093.tmp.com
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	dwm.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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe

Delays execution with timeout.exe 2 IoCs

evasion

pid	Process
2656	timeout.exe
2868	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
2976	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2384	tmpA093.tmp.com
2384	tmpA093.tmp.com
2384	tmpA093.tmp.com

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	3052	SunlightBootstrapper.exe
Token: SeDebugPrivilege	2384	tmpA093.tmp.com
Token: SeDebugPrivilege	2636	dwm.exe
Token: SeDebugPrivilege	2636	dwm.exe

Suspicious use of WriteProcessMemory 40 IoCs

description	pid	Process	procid_target
PID 3052 wrote to memory of 2384	3052	SunlightBootstrapper.exe	31
PID 3052 wrote to memory of 2384	3052	SunlightBootstrapper.exe	31
PID 3052 wrote to memory of 2384	3052	SunlightBootstrapper.exe	31
PID 3052 wrote to memory of 2384	3052	SunlightBootstrapper.exe	31
PID 2384 wrote to memory of 2784	2384	tmpA093.tmp.com	33
PID 2384 wrote to memory of 2784	2384	tmpA093.tmp.com	33
PID 2384 wrote to memory of 2784	2384	tmpA093.tmp.com	33
PID 2384 wrote to memory of 2784	2384	tmpA093.tmp.com	33
PID 2384 wrote to memory of 2964	2384	tmpA093.tmp.com	35
PID 2384 wrote to memory of 2964	2384	tmpA093.tmp.com	35
PID 2384 wrote to memory of 2964	2384	tmpA093.tmp.com	35
PID 2384 wrote to memory of 2964	2384	tmpA093.tmp.com	35
PID 2784 wrote to memory of 2976	2784	cmd.exe	37
PID 2784 wrote to memory of 2976	2784	cmd.exe	37
PID 2784 wrote to memory of 2976	2784	cmd.exe	37
PID 2784 wrote to memory of 2976	2784	cmd.exe	37
PID 2964 wrote to memory of 2656	2964	cmd.exe	38
PID 2964 wrote to memory of 2656	2964	cmd.exe	38
PID 2964 wrote to memory of 2656	2964	cmd.exe	38
PID 2964 wrote to memory of 2656	2964	cmd.exe	38
PID 2964 wrote to memory of 2636	2964	cmd.exe	39
PID 2964 wrote to memory of 2636	2964	cmd.exe	39
PID 2964 wrote to memory of 2636	2964	cmd.exe	39
PID 2964 wrote to memory of 2636	2964	cmd.exe	39
PID 2636 wrote to memory of 552	2636	dwm.exe	41
PID 2636 wrote to memory of 552	2636	dwm.exe	41
PID 2636 wrote to memory of 552	2636	dwm.exe	41
PID 2636 wrote to memory of 552	2636	dwm.exe	41
PID 2636 wrote to memory of 1940	2636	dwm.exe	43
PID 2636 wrote to memory of 1940	2636	dwm.exe	43
PID 2636 wrote to memory of 1940	2636	dwm.exe	43
PID 2636 wrote to memory of 1940	2636	dwm.exe	43
PID 552 wrote to memory of 2808	552	cmd.exe	45
PID 552 wrote to memory of 2808	552	cmd.exe	45
PID 552 wrote to memory of 2808	552	cmd.exe	45
PID 552 wrote to memory of 2808	552	cmd.exe	45
PID 1940 wrote to memory of 2868	1940	cmd.exe	46
PID 1940 wrote to memory of 2868	1940	cmd.exe	46
PID 1940 wrote to memory of 2868	1940	cmd.exe	46
PID 1940 wrote to memory of 2868	1940	cmd.exe	46

C:\Users\Admin\AppData\Local\Temp\SunlightBootstrapper.exe
"C:\Users\Admin\AppData\Local\Temp\SunlightBootstrapper.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3052
- C:\Users\Admin\AppData\Local\Temp\tmpA093.tmp.com
  "C:\Users\Admin\AppData\Local\Temp\tmpA093.tmp.com"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2384
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "dwm" /tr '"C:\Users\Admin\AppData\Local\Temp\dwm.exe"' & exit
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2784
  - - C:\Windows\SysWOW64\schtasks.exe
      schtasks /create /f /sc onlogon /rl highest /tn "dwm" /tr '"C:\Users\Admin\AppData\Local\Temp\dwm.exe"'
      4⤵
      System Location Discovery: System Language Discovery
      Scheduled Task/Job: Scheduled Task
      PID:2976
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpB03C.tmp.bat""
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2964
  - - C:\Windows\SysWOW64\timeout.exe
      timeout 3
      4⤵
      System Location Discovery: System Language Discovery
      Delays execution with timeout.exe
      PID:2656
  - - C:\Users\Admin\AppData\Local\Temp\dwm.exe
      "C:\Users\Admin\AppData\Local\Temp\dwm.exe"
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2636
    - - C:\Windows\SysWOW64\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /c schtasks /delete /f /tn "dwm"
        5⤵
        System Location Discovery: System Language Discovery
        Suspicious use of WriteProcessMemory
        
        PID:552
      - C:\Windows\SysWOW64\schtasks.exe
        
        schtasks /delete /f /tn "dwm"
        6⤵
        System Location Discovery: System Language Discovery
        
        PID:2808
    - - C:\Windows\SysWOW64\cmd.exe
        
        cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpDD2.tmp.bat""
        5⤵
        System Location Discovery: System Language Discovery
        Suspicious use of WriteProcessMemory
        
        PID:1940
      - C:\Windows\SysWOW64\timeout.exe
        
        timeout 3
        6⤵
        System Location Discovery: System Language Discovery
        Delays execution with timeout.exe
        
        PID:2868

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\CabCA63.tmp

Filesize
70KB

MD5
49aebf8cbd62d92ac215b2923fb1b9f5

SHA1
1723be06719828dda65ad804298d0431f6aff976

SHA256
b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f

SHA512
bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

Download Submit
C:\Users\Admin\AppData\Local\Temp\TarE748.tmp

Filesize
181KB

MD5
4ea6026cf93ec6338144661bf1202cd1

SHA1
a1dec9044f750ad887935a01430bf49322fbdcb7

SHA256
8efbc21559ef8b1bcf526800d8070baad42474ce7198e26fa771dbb41a76b1d8

SHA512
6c7e0980e39aacf4c3689802353f464a08cd17753bd210ee997e5f2a455deb4f287a9ef74d84579dbde49bc96213cd2b8b247723919c412ea980aa6e6bfe218b

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpA093.tmp.com

Filesize
47KB

MD5
c19fe978050f62a6efa3e92e37099ac5

SHA1
17029ede51032d5809a9f8c9b501de24603d5bef

SHA256
8ff24a5f07daa0a3d30c5482229825037b2ed80580c2a9fc7734ba3b162dee4a

SHA512
9f23ca7704e608e68194e41ef948d01d60aeb8361de24f3984410db7400039b0f13d5f7fc54c639ef646715faafb72ea471f3cb6fe76eaa3682346dd09ad6670

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpB03C.tmp.bat

Filesize
150B

MD5
60b04cf8457efd3f92a3faada6b6c50d

SHA1
3a10907e6f8abaf14e6239e03461cff946ce30ee

SHA256
bdacc248a3ce40ae25ccc02215d4876351b996e0b3cb3dee4d13a8863d7afb78

SHA512
bf4c2020c6293ad1d616386130828693e028d1dadacd66f909b01075a048ea46a454bc3bfd3d08fc62c12ee3ff41513aa120058baef720e60e8d8beecf3fc35c

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpDD2.tmp.bat

Filesize
154B

MD5
ec07d9ea5b3aeea0636da089c48e7f9c

SHA1
717cf055e7fa7ee8b4bb1f838623c7a13d9e2aa6

SHA256
886de8bcd637ab79403e1eb91eef80cc3c3b492a8cee5952120d76b82b1be105

SHA512
b9c9f8387086dce9ece457369a499d83df8404a74c740bdfe52512df788d0cbd54953799f31b54e9592912491990bdfa882dcff1bd34b46b349f833379cec18a

Download Submit
memory/2384-9-0x0000000074CAE000-0x0000000074CAF000-memory.dmp

Filesize
4KB

Download
memory/2384-10-0x00000000000E0000-0x00000000000F2000-memory.dmp

Filesize
72KB

Download
memory/2384-11-0x0000000074CA0000-0x000000007538E000-memory.dmp

Filesize
6.9MB

Download
memory/2384-20-0x0000000074CA0000-0x000000007538E000-memory.dmp

Filesize
6.9MB

Download
memory/2636-44-0x00000000004A0000-0x00000000004AE000-memory.dmp

Filesize
56KB

Download
memory/2636-27-0x0000000000F80000-0x0000000000F92000-memory.dmp

Filesize
72KB

Download
memory/2636-63-0x0000000000A20000-0x0000000000A2E000-memory.dmp

Filesize
56KB

Download
memory/3052-23-0x000007FEF5EA0000-0x000007FEF688C000-memory.dmp

Filesize
9.9MB

Download
memory/3052-2-0x000007FEF5EA0000-0x000007FEF688C000-memory.dmp

Filesize
9.9MB

Download
memory/3052-22-0x000007FEF5EA3000-0x000007FEF5EA4000-memory.dmp

Filesize
4KB

Download
memory/3052-1-0x0000000000F50000-0x0000000001120000-memory.dmp

Filesize
1.8MB

Download
memory/3052-0-0x000007FEF5EA3000-0x000007FEF5EA4000-memory.dmp

Filesize
4KB

Download