asyncrat | 8f6baf69e7e047012b20299cd4d3bf4f86eaee8c7f42fed6cb4a33b79ef51dd2

Analysis

max time kernel
130s
max time network
133s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
11-11-2024 13:34

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

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
behavioral2/files/0x000a000000023b90-6.dat	family_asyncrat

Checks computer location settings 2 TTPs 3 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-1-5-21-3442511616-637977696-3186306149-1000\Control Panel\International\Geo\Nation	tmp972F.tmp.com
Key value queried	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\Control Panel\International\Geo\Nation	dwm.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\Control Panel\International\Geo\Nation	SunlightBootstrapper.exe

Executes dropped EXE 2 IoCs

pid	Process
4920	tmp972F.tmp.com
5080	dwm.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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.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	tmp972F.tmp.com
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	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 2 IoCs

evasion

pid	Process
3324	timeout.exe
1976	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
1492	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
4920	tmp972F.tmp.com
4920	tmp972F.tmp.com
4920	tmp972F.tmp.com
4920	tmp972F.tmp.com
4920	tmp972F.tmp.com
4920	tmp972F.tmp.com
4920	tmp972F.tmp.com
4920	tmp972F.tmp.com
4920	tmp972F.tmp.com
4920	tmp972F.tmp.com
4920	tmp972F.tmp.com
4920	tmp972F.tmp.com
4920	tmp972F.tmp.com
4920	tmp972F.tmp.com
4920	tmp972F.tmp.com
4920	tmp972F.tmp.com
4920	tmp972F.tmp.com
4920	tmp972F.tmp.com
4920	tmp972F.tmp.com
4920	tmp972F.tmp.com
4920	tmp972F.tmp.com
4920	tmp972F.tmp.com
4920	tmp972F.tmp.com

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	2648	SunlightBootstrapper.exe
Token: SeDebugPrivilege	4920	tmp972F.tmp.com
Token: SeDebugPrivilege	5080	dwm.exe
Token: SeDebugPrivilege	5080	dwm.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2648 wrote to memory of 4920	2648	SunlightBootstrapper.exe	85
PID 2648 wrote to memory of 4920	2648	SunlightBootstrapper.exe	85
PID 2648 wrote to memory of 4920	2648	SunlightBootstrapper.exe	85
PID 4920 wrote to memory of 1936	4920	tmp972F.tmp.com	92
PID 4920 wrote to memory of 1936	4920	tmp972F.tmp.com	92
PID 4920 wrote to memory of 1936	4920	tmp972F.tmp.com	92
PID 4920 wrote to memory of 4792	4920	tmp972F.tmp.com	94
PID 4920 wrote to memory of 4792	4920	tmp972F.tmp.com	94
PID 4920 wrote to memory of 4792	4920	tmp972F.tmp.com	94
PID 1936 wrote to memory of 1492	1936	cmd.exe	96
PID 1936 wrote to memory of 1492	1936	cmd.exe	96
PID 1936 wrote to memory of 1492	1936	cmd.exe	96
PID 4792 wrote to memory of 3324	4792	cmd.exe	97
PID 4792 wrote to memory of 3324	4792	cmd.exe	97
PID 4792 wrote to memory of 3324	4792	cmd.exe	97
PID 4792 wrote to memory of 5080	4792	cmd.exe	99
PID 4792 wrote to memory of 5080	4792	cmd.exe	99
PID 4792 wrote to memory of 5080	4792	cmd.exe	99
PID 5080 wrote to memory of 3996	5080	dwm.exe	104
PID 5080 wrote to memory of 3996	5080	dwm.exe	104
PID 5080 wrote to memory of 3996	5080	dwm.exe	104
PID 5080 wrote to memory of 3104	5080	dwm.exe	106
PID 5080 wrote to memory of 3104	5080	dwm.exe	106
PID 5080 wrote to memory of 3104	5080	dwm.exe	106
PID 3104 wrote to memory of 1976	3104	cmd.exe	108
PID 3104 wrote to memory of 1976	3104	cmd.exe	108
PID 3104 wrote to memory of 1976	3104	cmd.exe	108
PID 3996 wrote to memory of 4660	3996	cmd.exe	109
PID 3996 wrote to memory of 4660	3996	cmd.exe	109
PID 3996 wrote to memory of 4660	3996	cmd.exe	109

C:\Users\Admin\AppData\Local\Temp\SunlightBootstrapper.exe
"C:\Users\Admin\AppData\Local\Temp\SunlightBootstrapper.exe"
1⤵
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2648
- C:\Users\Admin\AppData\Local\Temp\tmp972F.tmp.com
  "C:\Users\Admin\AppData\Local\Temp\tmp972F.tmp.com"
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4920
- - 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:1936
  - - 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:1492
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpAA4A.tmp.bat""
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:4792
  - - C:\Windows\SysWOW64\timeout.exe
      timeout 3
      4⤵
      System Location Discovery: System Language Discovery
      Delays execution with timeout.exe
      PID:3324
  - - C:\Users\Admin\AppData\Local\Temp\dwm.exe
      "C:\Users\Admin\AppData\Local\Temp\dwm.exe"
      4⤵
      Checks computer location settings
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:5080
    - - 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:3996
      - C:\Windows\SysWOW64\schtasks.exe
        
        schtasks /delete /f /tn "dwm"
        6⤵
        System Location Discovery: System Language Discovery
        
        PID:4660
    - - C:\Windows\SysWOW64\cmd.exe
        
        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp2333.tmp.bat""
        5⤵
        System Location Discovery: System Language Discovery
        Suspicious use of WriteProcessMemory
        
        PID:3104
      - C:\Windows\SysWOW64\timeout.exe
        
        timeout 3
        6⤵
        System Location Discovery: System Language Discovery
        Delays execution with timeout.exe
        
        PID:1976

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

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\tmp2333.tmp.bat

Filesize
155B

MD5
dbcf6fca8d947417657722cb22863a1a

SHA1
033b1c2350c496bb38284abfae6f00eead37323c

SHA256
dda0dd5a930816cd2ffa48068fc465457d34ad28a1bcdcc99c898db760eac499

SHA512
4efe08e9b3fec4af85acda1a3463491c6ef292d80e3e8c451191691c5ad0735b3d2c9f3615b3a5155df6388ee310104fbaa6b6a63e968390b354f3b6f120b090

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp972F.tmp.com

Filesize
47KB

MD5
c19fe978050f62a6efa3e92e37099ac5

SHA1
17029ede51032d5809a9f8c9b501de24603d5bef

SHA256
8ff24a5f07daa0a3d30c5482229825037b2ed80580c2a9fc7734ba3b162dee4a

SHA512
9f23ca7704e608e68194e41ef948d01d60aeb8361de24f3984410db7400039b0f13d5f7fc54c639ef646715faafb72ea471f3cb6fe76eaa3682346dd09ad6670

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpAA4A.tmp.bat

Filesize
150B

MD5
c7dc62a86bd1278b854ac9d0cbc1f2a2

SHA1
4839ccad9afe9c42fc2c785478b3362f656dd0a1

SHA256
cf883380696469998ab49207c835e834c3e69b9403150cd9d9fa2215c61b49e1

SHA512
15119c6d03a8c8f85b84132185926a859a279c348d492010a7ada89f27cc7320073d459cb109f11d9000d29e117e7e770b5a61389c43573e7314ff86a2da1b58

Download Submit
memory/2648-0-0x00007FFA8A943000-0x00007FFA8A945000-memory.dmp

Filesize
8KB

Download
memory/2648-1-0x00000196CBBC0000-0x00000196CBD90000-memory.dmp

Filesize
1.8MB

Download
memory/2648-2-0x00007FFA8A940000-0x00007FFA8B401000-memory.dmp

Filesize
10.8MB

Download
memory/2648-22-0x00007FFA8A940000-0x00007FFA8B401000-memory.dmp

Filesize
10.8MB

Download
memory/4920-12-0x0000000005970000-0x0000000005A0C000-memory.dmp

Filesize
624KB

Download
memory/4920-11-0x00000000054A0000-0x0000000005506000-memory.dmp

Filesize
408KB

Download
memory/4920-17-0x00000000748D0000-0x0000000075080000-memory.dmp

Filesize
7.7MB

Download
memory/4920-10-0x00000000748D0000-0x0000000075080000-memory.dmp

Filesize
7.7MB

Download
memory/4920-9-0x0000000000A70000-0x0000000000A82000-memory.dmp

Filesize
72KB

Download
memory/4920-8-0x00000000748DE000-0x00000000748DF000-memory.dmp

Filesize
4KB

Download
memory/5080-25-0x0000000005D60000-0x0000000006304000-memory.dmp

Filesize
5.6MB

Download
memory/5080-26-0x0000000006590000-0x0000000006606000-memory.dmp

Filesize
472KB

Download
memory/5080-27-0x0000000005250000-0x000000000525E000-memory.dmp

Filesize
56KB

Download
memory/5080-28-0x0000000005D30000-0x0000000005D4E000-memory.dmp

Filesize
120KB

Download