asyncrat | 8f6baf69e7e047012b20299cd4d3bf4f86eaee8c7f42fed6cb4a33b79ef51dd2

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

C2

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

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Local\Temp\tmpD633.tmp.com	family_asyncrat

Executes dropped EXE 2 IoCs

Processes:

tmpD633.tmp.comdwm.exe

pid process

2144 tmpD633.tmp.com
2728 dwm.exe
Loads dropped DLL 1 IoCs

Processes:

cmd.exe

pid process

2372 cmd.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
2144	tmpD633.tmp.com
2728	dwm.exe

pid	process
2372	cmd.exe

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

Processes:

cmd.execmd.execmd.exeschtasks.exetmpD633.tmp.comtimeout.exeschtasks.exedwm.execmd.exetimeout.exe

description	ioc	process
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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	tmpD633.tmp.com
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	dwm.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe

Delays execution with timeout.exe 2 IoCs
evasion

Processes:

timeout.exetimeout.exe

pid process

2632 timeout.exe
2292 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

Processes:

schtasks.exe

pid process

2644 schtasks.exe
Suspicious behavior: EnumeratesProcesses 3 IoCs

Processes:

tmpD633.tmp.com

pid process

2144 tmpD633.tmp.com
2144 tmpD633.tmp.com
2144 tmpD633.tmp.com

pid	process
2632	timeout.exe
2292	timeout.exe

pid	process
2644	schtasks.exe

pid	process
2144	tmpD633.tmp.com
2144	tmpD633.tmp.com
2144	tmpD633.tmp.com

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

SunlightBootstrapper.exetmpD633.tmp.comdwm.exe

description	pid	process
Token: SeDebugPrivilege	3044	SunlightBootstrapper.exe
Token: SeDebugPrivilege	2144	tmpD633.tmp.com
Token: SeDebugPrivilege	2728	dwm.exe
Token: SeDebugPrivilege	2728	dwm.exe

Suspicious use of WriteProcessMemory 40 IoCs

Processes:

SunlightBootstrapper.exetmpD633.tmp.comcmd.execmd.exedwm.execmd.execmd.exe

description	pid	process	target process
PID 3044 wrote to memory of 2144	3044	SunlightBootstrapper.exe	tmpD633.tmp.com
PID 3044 wrote to memory of 2144	3044	SunlightBootstrapper.exe	tmpD633.tmp.com
PID 3044 wrote to memory of 2144	3044	SunlightBootstrapper.exe	tmpD633.tmp.com
PID 3044 wrote to memory of 2144	3044	SunlightBootstrapper.exe	tmpD633.tmp.com
PID 2144 wrote to memory of 2828	2144	tmpD633.tmp.com	cmd.exe
PID 2144 wrote to memory of 2828	2144	tmpD633.tmp.com	cmd.exe
PID 2144 wrote to memory of 2828	2144	tmpD633.tmp.com	cmd.exe
PID 2144 wrote to memory of 2828	2144	tmpD633.tmp.com	cmd.exe
PID 2144 wrote to memory of 2372	2144	tmpD633.tmp.com	cmd.exe
PID 2144 wrote to memory of 2372	2144	tmpD633.tmp.com	cmd.exe
PID 2144 wrote to memory of 2372	2144	tmpD633.tmp.com	cmd.exe
PID 2144 wrote to memory of 2372	2144	tmpD633.tmp.com	cmd.exe
PID 2828 wrote to memory of 2644	2828	cmd.exe	schtasks.exe
PID 2828 wrote to memory of 2644	2828	cmd.exe	schtasks.exe
PID 2828 wrote to memory of 2644	2828	cmd.exe	schtasks.exe
PID 2828 wrote to memory of 2644	2828	cmd.exe	schtasks.exe
PID 2372 wrote to memory of 2632	2372	cmd.exe	timeout.exe
PID 2372 wrote to memory of 2632	2372	cmd.exe	timeout.exe
PID 2372 wrote to memory of 2632	2372	cmd.exe	timeout.exe
PID 2372 wrote to memory of 2632	2372	cmd.exe	timeout.exe
PID 2372 wrote to memory of 2728	2372	cmd.exe	dwm.exe
PID 2372 wrote to memory of 2728	2372	cmd.exe	dwm.exe
PID 2372 wrote to memory of 2728	2372	cmd.exe	dwm.exe
PID 2372 wrote to memory of 2728	2372	cmd.exe	dwm.exe
PID 2728 wrote to memory of 700	2728	dwm.exe	cmd.exe
PID 2728 wrote to memory of 700	2728	dwm.exe	cmd.exe
PID 2728 wrote to memory of 700	2728	dwm.exe	cmd.exe
PID 2728 wrote to memory of 700	2728	dwm.exe	cmd.exe
PID 2728 wrote to memory of 1144	2728	dwm.exe	cmd.exe
PID 2728 wrote to memory of 1144	2728	dwm.exe	cmd.exe
PID 2728 wrote to memory of 1144	2728	dwm.exe	cmd.exe
PID 2728 wrote to memory of 1144	2728	dwm.exe	cmd.exe
PID 700 wrote to memory of 2808	700	cmd.exe	schtasks.exe
PID 700 wrote to memory of 2808	700	cmd.exe	schtasks.exe
PID 700 wrote to memory of 2808	700	cmd.exe	schtasks.exe
PID 700 wrote to memory of 2808	700	cmd.exe	schtasks.exe
PID 1144 wrote to memory of 2292	1144	cmd.exe	timeout.exe
PID 1144 wrote to memory of 2292	1144	cmd.exe	timeout.exe
PID 1144 wrote to memory of 2292	1144	cmd.exe	timeout.exe
PID 1144 wrote to memory of 2292	1144	cmd.exe	timeout.exe

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:3044
- C:\Users\Admin\AppData\Local\Temp\tmpD633.tmp.com
  "C:\Users\Admin\AppData\Local\Temp\tmpD633.tmp.com"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2144
- - 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:2828
  - - 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:2644
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpE60B.tmp.bat""
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2372
  - - C:\Windows\SysWOW64\timeout.exe
      timeout 3
      4⤵
      System Location Discovery: System Language Discovery
      Delays execution with timeout.exe
      PID:2632
  - - 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:2728
    - - 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:700
      - 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\tmpD1D8.tmp.bat""
        5⤵
        System Location Discovery: System Language Discovery
        Suspicious use of WriteProcessMemory
        
        PID:1144
      - C:\Windows\SysWOW64\timeout.exe
        
        timeout 3
        6⤵
        System Location Discovery: System Language Discovery
        Delays execution with timeout.exe
        
        PID:2292

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

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

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

Filesize
70KB

MD5
49aebf8cbd62d92ac215b2923fb1b9f5

SHA1
1723be06719828dda65ad804298d0431f6aff976

SHA256
b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f

SHA512
bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

Download Submit
C:\Users\Admin\AppData\Local\Temp\TarD158.tmp

Filesize
181KB

MD5
4ea6026cf93ec6338144661bf1202cd1

SHA1
a1dec9044f750ad887935a01430bf49322fbdcb7

SHA256
8efbc21559ef8b1bcf526800d8070baad42474ce7198e26fa771dbb41a76b1d8

SHA512
6c7e0980e39aacf4c3689802353f464a08cd17753bd210ee997e5f2a455deb4f287a9ef74d84579dbde49bc96213cd2b8b247723919c412ea980aa6e6bfe218b

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpD1D8.tmp.bat

Filesize
155B

MD5
d4e5168448704ee938ab3fb1d775a7b5

SHA1
a6a72ee6e734718476f750340c8266e7e3badff0

SHA256
81aa7875cedff1a6836631c5d8f437dd5549863993b6077ace3f112b5a3ec3c7

SHA512
7cc19794165519673641ed24a2f25bdb849f3f4ae10a506c3d6c05b9dccc53430e48c9abf8ce1db58c41e6f4bf2b863dae4dcc45217fbd8193a6004e04aac0f0

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpD633.tmp.com

Filesize
47KB

MD5
c19fe978050f62a6efa3e92e37099ac5

SHA1
17029ede51032d5809a9f8c9b501de24603d5bef

SHA256
8ff24a5f07daa0a3d30c5482229825037b2ed80580c2a9fc7734ba3b162dee4a

SHA512
9f23ca7704e608e68194e41ef948d01d60aeb8361de24f3984410db7400039b0f13d5f7fc54c639ef646715faafb72ea471f3cb6fe76eaa3682346dd09ad6670

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpE60B.tmp.bat

Filesize
150B

MD5
0087daa1031b5901e41384604b5205ba

SHA1
1a9bb4108cc8283e8a7f532483dd08a2543b3b03

SHA256
496940d6d2f41725aedf400447a4952388c601c1ed595020f9f319281bc87ea4

SHA512
ad13ca5fa6f4bb78196c1fa671e6cd66dbcb5ff9c3861a6b0f4857c8fd970ea7bded608913e635c4bad9a863d50cc3958c7d8eccf9ad735535effe6b70eee7e7

Download Submit
memory/2144-9-0x000000007403E000-0x000000007403F000-memory.dmp

Filesize
4KB

Download
memory/2144-11-0x0000000074030000-0x000000007471E000-memory.dmp

Filesize
6.9MB

Download
memory/2144-10-0x0000000000FE0000-0x0000000000FF2000-memory.dmp

Filesize
72KB

Download
memory/2144-21-0x0000000074030000-0x000000007471E000-memory.dmp

Filesize
6.9MB

Download
memory/2728-27-0x0000000000AB0000-0x0000000000AC2000-memory.dmp

Filesize
72KB

Download
memory/2728-44-0x00000000004B0000-0x00000000004BE000-memory.dmp

Filesize
56KB

Download
memory/3044-22-0x000007FEF52B3000-0x000007FEF52B4000-memory.dmp

Filesize
4KB

Download
memory/3044-23-0x000007FEF52B0000-0x000007FEF5C9C000-memory.dmp

Filesize
9.9MB

Download
memory/3044-0-0x000007FEF52B3000-0x000007FEF52B4000-memory.dmp

Filesize
4KB

Download
memory/3044-2-0x000007FEF52B0000-0x000007FEF5C9C000-memory.dmp

Filesize
9.9MB

Download
memory/3044-1-0x0000000000EF0000-0x00000000010C0000-memory.dmp

Filesize
1.8MB

Download

Resubmissions

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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