asyncrat | 3e664b59ba376749eb9b596b6499bf7edcec5d34382ead80964f9fe92a4c3c83

General

Target

Krishna33.exe
Size

97KB
MD5

1ebef0766160be26918574b1645c1848
SHA1

c30739eeecb96079bcf6d4f40c94e35abb230e34
SHA256

3e664b59ba376749eb9b596b6499bf7edcec5d34382ead80964f9fe92a4c3c83
SHA512

01c42bb22a92543a3408c6f420593443357a53915937341b5eaf8563ee775dbdeba7af38e2df9c9cf249a512a5a42c65c4c4d39d100e8a4143e58fd235b85951
SSDEEP

1536:ou1a21T3xN2s/tH3bPXSiTbgd2HJ0cYeWQzPhOvVihneW9+e2:ouc6T3xN28tH3bPfIK0wz5OdRSN2

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

Default

C2

1.tcp.ap.ngrok.io:21049

Mutex

AsyncMutex_6SI8OkPnk

Attributes

delay
3
install
true
install_file
chrome.exe
install_folder
%AppData%

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/0x000a00000001202c-13.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2232	chrome.exe

Loads dropped DLL 1 IoCs

pid	Process
2552	cmd.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 3 IoCs

Web Service

T1102

flow	ioc
2	1.tcp.ap.ngrok.io
11	1.tcp.ap.ngrok.io
20	1.tcp.ap.ngrok.io

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 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

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	chrome.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Krishna33.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

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2784	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
1812	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2676	Krishna33.exe
2676	Krishna33.exe
2676	Krishna33.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2676	Krishna33.exe
Token: SeDebugPrivilege	2232	chrome.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 2676 wrote to memory of 2368	2676	Krishna33.exe	30
PID 2676 wrote to memory of 2368	2676	Krishna33.exe	30
PID 2676 wrote to memory of 2368	2676	Krishna33.exe	30
PID 2676 wrote to memory of 2368	2676	Krishna33.exe	30
PID 2676 wrote to memory of 2552	2676	Krishna33.exe	32
PID 2676 wrote to memory of 2552	2676	Krishna33.exe	32
PID 2676 wrote to memory of 2552	2676	Krishna33.exe	32
PID 2676 wrote to memory of 2552	2676	Krishna33.exe	32
PID 2368 wrote to memory of 1812	2368	cmd.exe	34
PID 2368 wrote to memory of 1812	2368	cmd.exe	34
PID 2368 wrote to memory of 1812	2368	cmd.exe	34
PID 2368 wrote to memory of 1812	2368	cmd.exe	34
PID 2552 wrote to memory of 2784	2552	cmd.exe	35
PID 2552 wrote to memory of 2784	2552	cmd.exe	35
PID 2552 wrote to memory of 2784	2552	cmd.exe	35
PID 2552 wrote to memory of 2784	2552	cmd.exe	35
PID 2552 wrote to memory of 2232	2552	cmd.exe	36
PID 2552 wrote to memory of 2232	2552	cmd.exe	36
PID 2552 wrote to memory of 2232	2552	cmd.exe	36
PID 2552 wrote to memory of 2232	2552	cmd.exe	36

C:\Users\Admin\AppData\Local\Temp\Krishna33.exe
"C:\Users\Admin\AppData\Local\Temp\Krishna33.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2676
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "chrome" /tr '"C:\Users\Admin\AppData\Roaming\chrome.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2368
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "chrome" /tr '"C:\Users\Admin\AppData\Roaming\chrome.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1812
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpA515.tmp.bat""
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2552
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2784
- - C:\Users\Admin\AppData\Roaming\chrome.exe
    "C:\Users\Admin\AppData\Roaming\chrome.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2232

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

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpA515.tmp.bat

Filesize
150B

MD5
47340d569f08ec5a520edee9f04c0ac3

SHA1
07047d8f6c358d4b934beee68c314c0b41db01b5

SHA256
1edfcfca12d965397ad67ca0d51b86794370571ff33ec06ae88ddc6b9f0fbbe8

SHA512
7c7bf18087f140ab503ce4d07ead85a848b01e5b06f30c66b1d06cd28695506f09ed32d56f500d8ccc6b5d4ba5936aab0d351651486144b3936e96f066129987

Download Submit
\Users\Admin\AppData\Roaming\chrome.exe

Filesize
97KB

MD5
1ebef0766160be26918574b1645c1848

SHA1
c30739eeecb96079bcf6d4f40c94e35abb230e34

SHA256
3e664b59ba376749eb9b596b6499bf7edcec5d34382ead80964f9fe92a4c3c83

SHA512
01c42bb22a92543a3408c6f420593443357a53915937341b5eaf8563ee775dbdeba7af38e2df9c9cf249a512a5a42c65c4c4d39d100e8a4143e58fd235b85951

Download Submit
memory/2232-16-0x0000000000C40000-0x0000000000C5E000-memory.dmp

Filesize
120KB

Download
memory/2676-0-0x0000000073DDE000-0x0000000073DDF000-memory.dmp

Filesize
4KB

Download
memory/2676-1-0x0000000000970000-0x000000000098E000-memory.dmp

Filesize
120KB

Download
memory/2676-2-0x0000000073DD0000-0x00000000744BE000-memory.dmp

Filesize
6.9MB

Download
memory/2676-11-0x0000000073DD0000-0x00000000744BE000-memory.dmp

Filesize
6.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads