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\tmp1008.tmp.com	family_asyncrat

Executes dropped EXE 2 IoCs

Processes:

tmp1008.tmp.comdwm.exe

pid process

2764 tmp1008.tmp.com
1724 dwm.exe
Loads dropped DLL 1 IoCs

Processes:

cmd.exe

pid process

2588 cmd.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
2764	tmp1008.tmp.com
1724	dwm.exe

pid	process
2588	cmd.exe

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

Processes:

timeout.exedwm.exetmp1008.tmp.comcmd.execmd.exeschtasks.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	dwm.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	tmp1008.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	schtasks.exe

Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

3008 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

3048 schtasks.exe
Suspicious behavior: EnumeratesProcesses 3 IoCs

Processes:

tmp1008.tmp.com

pid process

2764 tmp1008.tmp.com
2764 tmp1008.tmp.com
2764 tmp1008.tmp.com

pid	process
3008	timeout.exe

pid	process
3048	schtasks.exe

pid	process
2764	tmp1008.tmp.com
2764	tmp1008.tmp.com
2764	tmp1008.tmp.com

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

SunlightBootstrapper.exetmp1008.tmp.comdwm.exe

description	pid	process
Token: SeDebugPrivilege	2848	SunlightBootstrapper.exe
Token: SeDebugPrivilege	2764	tmp1008.tmp.com
Token: SeDebugPrivilege	1724	dwm.exe
Token: SeDebugPrivilege	1724	dwm.exe

Suspicious use of WriteProcessMemory 24 IoCs

Processes:

SunlightBootstrapper.exetmp1008.tmp.comcmd.execmd.exe

description	pid	process	target process
PID 2848 wrote to memory of 2764	2848	SunlightBootstrapper.exe	tmp1008.tmp.com
PID 2848 wrote to memory of 2764	2848	SunlightBootstrapper.exe	tmp1008.tmp.com
PID 2848 wrote to memory of 2764	2848	SunlightBootstrapper.exe	tmp1008.tmp.com
PID 2848 wrote to memory of 2764	2848	SunlightBootstrapper.exe	tmp1008.tmp.com
PID 2764 wrote to memory of 2728	2764	tmp1008.tmp.com	cmd.exe
PID 2764 wrote to memory of 2728	2764	tmp1008.tmp.com	cmd.exe
PID 2764 wrote to memory of 2728	2764	tmp1008.tmp.com	cmd.exe
PID 2764 wrote to memory of 2728	2764	tmp1008.tmp.com	cmd.exe
PID 2764 wrote to memory of 2588	2764	tmp1008.tmp.com	cmd.exe
PID 2764 wrote to memory of 2588	2764	tmp1008.tmp.com	cmd.exe
PID 2764 wrote to memory of 2588	2764	tmp1008.tmp.com	cmd.exe
PID 2764 wrote to memory of 2588	2764	tmp1008.tmp.com	cmd.exe
PID 2728 wrote to memory of 3048	2728	cmd.exe	schtasks.exe
PID 2728 wrote to memory of 3048	2728	cmd.exe	schtasks.exe
PID 2728 wrote to memory of 3048	2728	cmd.exe	schtasks.exe
PID 2728 wrote to memory of 3048	2728	cmd.exe	schtasks.exe
PID 2588 wrote to memory of 3008	2588	cmd.exe	timeout.exe
PID 2588 wrote to memory of 3008	2588	cmd.exe	timeout.exe
PID 2588 wrote to memory of 3008	2588	cmd.exe	timeout.exe
PID 2588 wrote to memory of 3008	2588	cmd.exe	timeout.exe
PID 2588 wrote to memory of 1724	2588	cmd.exe	dwm.exe
PID 2588 wrote to memory of 1724	2588	cmd.exe	dwm.exe
PID 2588 wrote to memory of 1724	2588	cmd.exe	dwm.exe
PID 2588 wrote to memory of 1724	2588	cmd.exe	dwm.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:2848
- C:\Users\Admin\AppData\Local\Temp\tmp1008.tmp.com
  "C:\Users\Admin\AppData\Local\Temp\tmp1008.tmp.com"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2764
- - 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:2728
  - - 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:3048
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp1FB1.tmp.bat""
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2588
  - - C:\Windows\SysWOW64\timeout.exe
      timeout 3
      4⤵
      System Location Discovery: System Language Discovery
      Delays execution with timeout.exe
      PID:3008
  - - 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
      PID:1724

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

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Downloads

C:\Users\Admin\AppData\Local\Temp\Cab3A16.tmp

Filesize
70KB

MD5
49aebf8cbd62d92ac215b2923fb1b9f5

SHA1
1723be06719828dda65ad804298d0431f6aff976

SHA256
b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f

SHA512
bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

Download Submit
C:\Users\Admin\AppData\Local\Temp\TarAB32.tmp

Filesize
181KB

MD5
4ea6026cf93ec6338144661bf1202cd1

SHA1
a1dec9044f750ad887935a01430bf49322fbdcb7

SHA256
8efbc21559ef8b1bcf526800d8070baad42474ce7198e26fa771dbb41a76b1d8

SHA512
6c7e0980e39aacf4c3689802353f464a08cd17753bd210ee997e5f2a455deb4f287a9ef74d84579dbde49bc96213cd2b8b247723919c412ea980aa6e6bfe218b

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp1008.tmp.com

Filesize
47KB

MD5
c19fe978050f62a6efa3e92e37099ac5

SHA1
17029ede51032d5809a9f8c9b501de24603d5bef

SHA256
8ff24a5f07daa0a3d30c5482229825037b2ed80580c2a9fc7734ba3b162dee4a

SHA512
9f23ca7704e608e68194e41ef948d01d60aeb8361de24f3984410db7400039b0f13d5f7fc54c639ef646715faafb72ea471f3cb6fe76eaa3682346dd09ad6670

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp1FB1.tmp.bat

Filesize
150B

MD5
1443e2ecd0b489aa779e6069e5bb1710

SHA1
11be64b8d155dd07b89c07e279636c604810d9b8

SHA256
37b0bd57a009331705134b0002b11ce443a1efeae00fff067cfe29c53559cfe3

SHA512
e8497f378a9d28ded8997126714c206244eb4a33e9b805d8df464f977ad5098bc15fef474bd0ea8a7c7ddcf798cd51118084fef74fe7c055422b4d14cccdb582

Download Submit
memory/1724-44-0x0000000000740000-0x000000000074E000-memory.dmp

Filesize
56KB

Download
memory/1724-27-0x00000000010B0000-0x00000000010C2000-memory.dmp

Filesize
72KB

Download
memory/2764-11-0x0000000074A80000-0x000000007516E000-memory.dmp

Filesize
6.9MB

Download
memory/2764-20-0x0000000074A80000-0x000000007516E000-memory.dmp

Filesize
6.9MB

Download
memory/2764-10-0x0000000000CF0000-0x0000000000D02000-memory.dmp

Filesize
72KB

Download
memory/2764-9-0x0000000074A8E000-0x0000000074A8F000-memory.dmp

Filesize
4KB

Download
memory/2848-0-0x000007FEF5E13000-0x000007FEF5E14000-memory.dmp

Filesize
4KB

Download
memory/2848-22-0x000007FEF5E13000-0x000007FEF5E14000-memory.dmp

Filesize
4KB

Download
memory/2848-23-0x000007FEF5E10000-0x000007FEF67FC000-memory.dmp

Filesize
9.9MB

Download
memory/2848-2-0x000007FEF5E10000-0x000007FEF67FC000-memory.dmp

Filesize
9.9MB

Download
memory/2848-1-0x0000000000E10000-0x0000000000FE0000-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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