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
behavioral2/files/0x000a000000023b73-11.dat	family_asyncrat

Checks computer location settings 2 TTPs 1 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-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	Krishna33.exe

Executes dropped EXE 1 IoCs

pid	Process
4956	chrome.exe

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

Web Service

T1102

flow	ioc
14	1.tcp.ap.ngrok.io
42	1.tcp.ap.ngrok.io
57	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	chrome.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
376	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
736	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
4724	Krishna33.exe
4724	Krishna33.exe
4724	Krishna33.exe
4724	Krishna33.exe
4724	Krishna33.exe
4724	Krishna33.exe
4724	Krishna33.exe
4724	Krishna33.exe
4724	Krishna33.exe
4724	Krishna33.exe
4724	Krishna33.exe
4724	Krishna33.exe
4724	Krishna33.exe
4724	Krishna33.exe
4724	Krishna33.exe
4724	Krishna33.exe
4724	Krishna33.exe
4724	Krishna33.exe
4724	Krishna33.exe
4724	Krishna33.exe
4724	Krishna33.exe
4724	Krishna33.exe
4724	Krishna33.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4724	Krishna33.exe
Token: SeDebugPrivilege	4956	chrome.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4724 wrote to memory of 1044	4724	Krishna33.exe	84
PID 4724 wrote to memory of 1044	4724	Krishna33.exe	84
PID 4724 wrote to memory of 1044	4724	Krishna33.exe	84
PID 4724 wrote to memory of 3040	4724	Krishna33.exe	86
PID 4724 wrote to memory of 3040	4724	Krishna33.exe	86
PID 4724 wrote to memory of 3040	4724	Krishna33.exe	86
PID 1044 wrote to memory of 736	1044	cmd.exe	88
PID 1044 wrote to memory of 736	1044	cmd.exe	88
PID 1044 wrote to memory of 736	1044	cmd.exe	88
PID 3040 wrote to memory of 376	3040	cmd.exe	89
PID 3040 wrote to memory of 376	3040	cmd.exe	89
PID 3040 wrote to memory of 376	3040	cmd.exe	89
PID 3040 wrote to memory of 4956	3040	cmd.exe	96
PID 3040 wrote to memory of 4956	3040	cmd.exe	96
PID 3040 wrote to memory of 4956	3040	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\Krishna33.exe
"C:\Users\Admin\AppData\Local\Temp\Krishna33.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4724
- 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:1044
- - 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:736
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp8F11.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3040
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:376
- - 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:4956

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

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\tmp8F11.tmp.bat

Filesize
150B

MD5
caa318c6e33f3a5691b71290629ee316

SHA1
e6ce0791c1e0ec1ada5ec6bc143c07c2b1fd1549

SHA256
dc6f2eafd193ad0b952ce44357233f3863a97b7aeea727553fb2e8ca8d20fca7

SHA512
46683435cb909116a387118ab213e3be86dd35ea6d653441bb53dab4cf9071585ce6d834cccdc54d3ea6d02f0e2f3bb84106a9ba4e7020e8424373f301d595a6

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

Filesize
97KB

MD5
1ebef0766160be26918574b1645c1848

SHA1
c30739eeecb96079bcf6d4f40c94e35abb230e34

SHA256
3e664b59ba376749eb9b596b6499bf7edcec5d34382ead80964f9fe92a4c3c83

SHA512
01c42bb22a92543a3408c6f420593443357a53915937341b5eaf8563ee775dbdeba7af38e2df9c9cf249a512a5a42c65c4c4d39d100e8a4143e58fd235b85951

Download Submit
memory/4724-0-0x0000000074D4E000-0x0000000074D4F000-memory.dmp

Filesize
4KB

Download
memory/4724-1-0x0000000000A70000-0x0000000000A8E000-memory.dmp

Filesize
120KB

Download
memory/4724-2-0x0000000074D40000-0x00000000754F0000-memory.dmp

Filesize
7.7MB

Download
memory/4724-3-0x0000000005440000-0x00000000054DC000-memory.dmp

Filesize
624KB

Download
memory/4724-8-0x0000000074D40000-0x00000000754F0000-memory.dmp

Filesize
7.7MB

Download
memory/4956-13-0x0000000074C90000-0x0000000075440000-memory.dmp

Filesize
7.7MB

Download
memory/4956-14-0x0000000074C90000-0x0000000075440000-memory.dmp

Filesize
7.7MB

Download
memory/4956-15-0x0000000074C90000-0x0000000075440000-memory.dmp

Filesize
7.7MB

Download
memory/4956-16-0x0000000074C90000-0x0000000075440000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads