asyncrat | b3228db9bbc763295df17ec8c46d2a68bb6bba6f3300251ad0d90006b10cd979

General

Target

b3228db9bbc763295df17ec8c46d2a68bb6bba6f3300251ad0d90006b10cd979.exe
Size

2.8MB
MD5

00487f368ca1e0b393b10864ac1c1acb
SHA1

f608a84f0b0ee4b4bcf33525549214a9e0e04e15
SHA256

b3228db9bbc763295df17ec8c46d2a68bb6bba6f3300251ad0d90006b10cd979
SHA512

49d7583463e2a24d10f9625d1b9ea7b5c1246332d2f5c38471aae9522b67ef414fbf81bf74b4da5af1e83e23fb06fab67f823b657912a4359fdeaa5419e9a19f
SSDEEP

49152:Z7StcEqQHLQ+d2jVuBxzHYT/eZiKsEXdXP:ktc1okLc7jxd/

Score

10^/10

asyncrat default discovery rat upx

Malware Config

Extracted

Family

asyncrat

Botnet

Default

C2

allay.x3322.net:5050

Mutex

gnrfjlujxmukjuvrs

Attributes

delay
1
install
true
install_file
WriteFile.exe
install_folder
%AppData%

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat

VenomRAT 5 IoCs

Detects VenomRAT.

rat

Processes:

resource	yara_rule
behavioral1/memory/2412-1-0x0000000000400000-0x000000000070E000-memory.dmp	VenomRAT
C:\Client.exe	VenomRAT
behavioral1/memory/2632-11-0x0000000000AF0000-0x0000000000B08000-memory.dmp	VenomRAT
behavioral1/memory/1936-28-0x0000000001390000-0x00000000013A8000-memory.dmp	VenomRAT
behavioral1/memory/2412-30-0x0000000000400000-0x000000000070E000-memory.dmp	VenomRAT

Async RAT payload 1 IoCs

rat

Processes:

resource	yara_rule
C:\Client.exe	family_asyncrat

Executes dropped EXE 2 IoCs

Processes:

Client.exeWriteFile.exe

pid process

2632 Client.exe
1936 WriteFile.exe

pid	process
2632	Client.exe
1936	WriteFile.exe

UPX packed file 3 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

Processes:

resource	yara_rule
behavioral1/memory/2412-2-0x0000000068CD0000-0x0000000068CDF000-memory.dmp	upx
behavioral1/memory/2412-4-0x00000000009E0000-0x00000000009EF000-memory.dmp	upx
behavioral1/memory/2412-3-0x00000000009E0000-0x00000000009EF000-memory.dmp	upx

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

System Information Discovery
T1082
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

1336 2412 WerFault.exe b3228db9bbc763295df17ec8c46d2a68bb6bba6f3300251ad0d90006b10cd979.exe

pid	pid_target	process	target process
1336	2412	WerFault.exe	b3228db9bbc763295df17ec8c46d2a68bb6bba6f3300251ad0d90006b10cd979.exe

System Location Discovery: System Language Discovery 1 TTPs 1 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:

b3228db9bbc763295df17ec8c46d2a68bb6bba6f3300251ad0d90006b10cd979.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	b3228db9bbc763295df17ec8c46d2a68bb6bba6f3300251ad0d90006b10cd979.exe

Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

672 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

1992 schtasks.exe

pid	process
672	timeout.exe

pid	process
1992	schtasks.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

Processes:

b3228db9bbc763295df17ec8c46d2a68bb6bba6f3300251ad0d90006b10cd979.exeClient.exeWriteFile.exe

pid	process
2412	b3228db9bbc763295df17ec8c46d2a68bb6bba6f3300251ad0d90006b10cd979.exe
2632	Client.exe
2632	Client.exe
2632	Client.exe
1936	WriteFile.exe
1936	WriteFile.exe
1936	WriteFile.exe
1936	WriteFile.exe
1936	WriteFile.exe
1936	WriteFile.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client.exeWriteFile.exe

description pid process

Token: SeDebugPrivilege 2632 Client.exe
Token: SeDebugPrivilege 1936 WriteFile.exe

description	pid	process
Token: SeDebugPrivilege	2632	Client.exe
Token: SeDebugPrivilege	1936	WriteFile.exe

Suspicious use of SetWindowsHookEx 3 IoCs

Processes:

b3228db9bbc763295df17ec8c46d2a68bb6bba6f3300251ad0d90006b10cd979.exeWriteFile.exe

pid	process
2412	b3228db9bbc763295df17ec8c46d2a68bb6bba6f3300251ad0d90006b10cd979.exe
2412	b3228db9bbc763295df17ec8c46d2a68bb6bba6f3300251ad0d90006b10cd979.exe
1936	WriteFile.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

b3228db9bbc763295df17ec8c46d2a68bb6bba6f3300251ad0d90006b10cd979.exeClient.execmd.execmd.exe

description	pid	process	target process
PID 2412 wrote to memory of 2632	2412	b3228db9bbc763295df17ec8c46d2a68bb6bba6f3300251ad0d90006b10cd979.exe	Client.exe
PID 2412 wrote to memory of 2632	2412	b3228db9bbc763295df17ec8c46d2a68bb6bba6f3300251ad0d90006b10cd979.exe	Client.exe
PID 2412 wrote to memory of 2632	2412	b3228db9bbc763295df17ec8c46d2a68bb6bba6f3300251ad0d90006b10cd979.exe	Client.exe
PID 2412 wrote to memory of 2632	2412	b3228db9bbc763295df17ec8c46d2a68bb6bba6f3300251ad0d90006b10cd979.exe	Client.exe
PID 2632 wrote to memory of 2592	2632	Client.exe	cmd.exe
PID 2632 wrote to memory of 2592	2632	Client.exe	cmd.exe
PID 2632 wrote to memory of 2592	2632	Client.exe	cmd.exe
PID 2632 wrote to memory of 2236	2632	Client.exe	cmd.exe
PID 2632 wrote to memory of 2236	2632	Client.exe	cmd.exe
PID 2632 wrote to memory of 2236	2632	Client.exe	cmd.exe
PID 2592 wrote to memory of 1992	2592	cmd.exe	schtasks.exe
PID 2592 wrote to memory of 1992	2592	cmd.exe	schtasks.exe
PID 2592 wrote to memory of 1992	2592	cmd.exe	schtasks.exe
PID 2236 wrote to memory of 672	2236	cmd.exe	timeout.exe
PID 2236 wrote to memory of 672	2236	cmd.exe	timeout.exe
PID 2236 wrote to memory of 672	2236	cmd.exe	timeout.exe
PID 2236 wrote to memory of 1936	2236	cmd.exe	WriteFile.exe
PID 2236 wrote to memory of 1936	2236	cmd.exe	WriteFile.exe
PID 2236 wrote to memory of 1936	2236	cmd.exe	WriteFile.exe
PID 2412 wrote to memory of 1336	2412	b3228db9bbc763295df17ec8c46d2a68bb6bba6f3300251ad0d90006b10cd979.exe	WerFault.exe
PID 2412 wrote to memory of 1336	2412	b3228db9bbc763295df17ec8c46d2a68bb6bba6f3300251ad0d90006b10cd979.exe	WerFault.exe
PID 2412 wrote to memory of 1336	2412	b3228db9bbc763295df17ec8c46d2a68bb6bba6f3300251ad0d90006b10cd979.exe	WerFault.exe
PID 2412 wrote to memory of 1336	2412	b3228db9bbc763295df17ec8c46d2a68bb6bba6f3300251ad0d90006b10cd979.exe	WerFault.exe

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\b3228db9bbc763295df17ec8c46d2a68bb6bba6f3300251ad0d90006b10cd979.exe
"C:\Users\Admin\AppData\Local\Temp\b3228db9bbc763295df17ec8c46d2a68bb6bba6f3300251ad0d90006b10cd979.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2412
- C:\Client.exe
  "C:\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2632
- - C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "WriteFile" /tr '"C:\Users\Admin\AppData\Roaming\WriteFile.exe"' & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2592
  - - C:\Windows\system32\schtasks.exe
      schtasks /create /f /sc onlogon /rl highest /tn "WriteFile" /tr '"C:\Users\Admin\AppData\Roaming\WriteFile.exe"'
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:1992
- - C:\Windows\system32\cmd.exe
    cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp6410.tmp.bat""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2236
  - - C:\Windows\system32\timeout.exe
      timeout 3
      4⤵
      Delays execution with timeout.exe
      PID:672
  - - C:\Users\Admin\AppData\Roaming\WriteFile.exe
      "C:\Users\Admin\AppData\Roaming\WriteFile.exe"
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of SetWindowsHookEx
      PID:1936
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2412 -s 860
  2⤵
  - Program crash
  PID:1336

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

Query Registry

1

T1012

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:\Client.exe

Filesize
74KB

MD5
b7d579e26b673c6866c448e6af708515

SHA1
ef19b6d6fcd369c8636dc0539dd32589a89f2c09

SHA256
6035245b15f24292d031bb460c6b9a4301ced628f93d37b58771aca3b49aa07a

SHA512
df0ad0004e9e40274bdd4ac586400b096679d456e35b0ac2a2d25c15cff17557428bb38023c8ed38c52e3d7eef962cfd1c3092f82fe5ea2ef1cf0ea442c8741c

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp6410.tmp.bat

Filesize
153B

MD5
c6a7675c0b7fef2db938511c77c647b6

SHA1
1e8d8d7141e3e34e0f4e15cd591333bbae65f304

SHA256
5d46d15d7898d0b4f0ebacbbc2f277196b6a7d1bdfd5a7658f798b8589392f72

SHA512
4046b1bc008cee0c57be4453034d27edee744ff55175fbfdd1a5e847f80bfc3ac96015ccfdba587b756240364bc73cbbd178ee5d72c7e14e69d1c0d0a14ab00c

Download Submit
C:\Users\Admin\AppData\Roaming\MyData\DataLogs.conf

Filesize
8B

MD5
cf759e4c5f14fe3eec41b87ed756cea8

SHA1
c27c796bb3c2fac929359563676f4ba1ffada1f5

SHA256
c9f9f193409217f73cc976ad078c6f8bf65d3aabcf5fad3e5a47536d47aa6761

SHA512
c7f832aee13a5eb36d145f35d4464374a9e12fa2017f3c2257442d67483b35a55eccae7f7729243350125b37033e075efbc2303839fd86b81b9b4dca3626953b

Download Submit
memory/1936-28-0x0000000001390000-0x00000000013A8000-memory.dmp

Filesize
96KB

Download
memory/2412-1-0x0000000000400000-0x000000000070E000-memory.dmp

Filesize
3.1MB

Download
memory/2412-4-0x00000000009E0000-0x00000000009EF000-memory.dmp

Filesize
60KB

Download
memory/2412-3-0x00000000009E0000-0x00000000009EF000-memory.dmp

Filesize
60KB

Download
memory/2412-30-0x0000000000400000-0x000000000070E000-memory.dmp

Filesize
3.1MB

Download
memory/2412-2-0x0000000068CD0000-0x0000000068CDF000-memory.dmp

Filesize
60KB

Download
memory/2632-11-0x0000000000AF0000-0x0000000000B08000-memory.dmp

Filesize
96KB

Download
memory/2632-23-0x000007FEF5410000-0x000007FEF5DFC000-memory.dmp

Filesize
9.9MB

Download
memory/2632-14-0x000007FEF5410000-0x000007FEF5DFC000-memory.dmp

Filesize
9.9MB

Download
memory/2632-13-0x000007FEF5410000-0x000007FEF5DFC000-memory.dmp

Filesize
9.9MB

Download
memory/2632-10-0x000007FEF5413000-0x000007FEF5414000-memory.dmp

Filesize
4KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads