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

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Roaming\chrome.exe	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

Processes:

Krishna33.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	Krishna33.exe

Executes dropped EXE 1 IoCs

Processes:

chrome.exe

pid process

5024 chrome.exe
Legitimate hosting services abused for malware hosting/C2 1 TTPs 3 IoCs

Web Service
T1102

Processes:

flow ioc

26 1.tcp.ap.ngrok.io
52 1.tcp.ap.ngrok.io
74 1.tcp.ap.ngrok.io
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
5024	chrome.exe

flow	ioc
26	1.tcp.ap.ngrok.io
52	1.tcp.ap.ngrok.io
74	1.tcp.ap.ngrok.io

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:

cmd.exeschtasks.exetimeout.exechrome.exeKrishna33.execmd.exe

description	ioc	process
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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Krishna33.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

4856 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

3704 schtasks.exe

pid	process
4856	timeout.exe

pid	process
3704	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

Processes:

Krishna33.exe

pid	process
2044	Krishna33.exe
2044	Krishna33.exe
2044	Krishna33.exe
2044	Krishna33.exe
2044	Krishna33.exe
2044	Krishna33.exe
2044	Krishna33.exe
2044	Krishna33.exe
2044	Krishna33.exe
2044	Krishna33.exe
2044	Krishna33.exe
2044	Krishna33.exe
2044	Krishna33.exe
2044	Krishna33.exe
2044	Krishna33.exe
2044	Krishna33.exe
2044	Krishna33.exe
2044	Krishna33.exe
2044	Krishna33.exe
2044	Krishna33.exe
2044	Krishna33.exe
2044	Krishna33.exe
2044	Krishna33.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Krishna33.exechrome.exe

description pid process

Token: SeDebugPrivilege 2044 Krishna33.exe
Token: SeDebugPrivilege 5024 chrome.exe

description	pid	process
Token: SeDebugPrivilege	2044	Krishna33.exe
Token: SeDebugPrivilege	5024	chrome.exe

Suspicious use of WriteProcessMemory 15 IoCs

Processes:

Krishna33.execmd.execmd.exe

description	pid	process	target process
PID 2044 wrote to memory of 2296	2044	Krishna33.exe	cmd.exe
PID 2044 wrote to memory of 2296	2044	Krishna33.exe	cmd.exe
PID 2044 wrote to memory of 2296	2044	Krishna33.exe	cmd.exe
PID 2044 wrote to memory of 3616	2044	Krishna33.exe	cmd.exe
PID 2044 wrote to memory of 3616	2044	Krishna33.exe	cmd.exe
PID 2044 wrote to memory of 3616	2044	Krishna33.exe	cmd.exe
PID 2296 wrote to memory of 3704	2296	cmd.exe	schtasks.exe
PID 2296 wrote to memory of 3704	2296	cmd.exe	schtasks.exe
PID 2296 wrote to memory of 3704	2296	cmd.exe	schtasks.exe
PID 3616 wrote to memory of 4856	3616	cmd.exe	timeout.exe
PID 3616 wrote to memory of 4856	3616	cmd.exe	timeout.exe
PID 3616 wrote to memory of 4856	3616	cmd.exe	timeout.exe
PID 3616 wrote to memory of 5024	3616	cmd.exe	chrome.exe
PID 3616 wrote to memory of 5024	3616	cmd.exe	chrome.exe
PID 3616 wrote to memory of 5024	3616	cmd.exe	chrome.exe

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:2044

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:2296

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:3704

C:\Windows\SysWOW64\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpA807.tmp.bat""
2⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3616

C:\Windows\SysWOW64\timeout.exe
timeout 3
3⤵
- System Location Discovery: System Language Discovery
- Delays execution with timeout.exe
PID:4856

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:5024

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\tmpA807.tmp.bat

Filesize
150B

MD5
1abe667a4578357750802d7c62634a85

SHA1
8f8278488766f6e54150a5447f295e4a2b228a93

SHA256
30019306bb01798b08591f6272038f3ce8bff4bf8304800514b0c3530a250af6

SHA512
2cb61c683bd91e129608a30de4cc8d0fd56504f42b01adcceea0fdf8a0bce693adb9046297db950afffff6fddeaa83506444478c533b3d245416f7918effce87

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

Filesize
97KB

MD5
1ebef0766160be26918574b1645c1848

SHA1
c30739eeecb96079bcf6d4f40c94e35abb230e34

SHA256
3e664b59ba376749eb9b596b6499bf7edcec5d34382ead80964f9fe92a4c3c83

SHA512
01c42bb22a92543a3408c6f420593443357a53915937341b5eaf8563ee775dbdeba7af38e2df9c9cf249a512a5a42c65c4c4d39d100e8a4143e58fd235b85951

Download Submit
memory/2044-0-0x00000000746BE000-0x00000000746BF000-memory.dmp

Filesize
4KB

Download
memory/2044-1-0x0000000000F80000-0x0000000000F9E000-memory.dmp

Filesize
120KB

Download
memory/2044-2-0x00000000746B0000-0x0000000074E60000-memory.dmp

Filesize
7.7MB

Download
memory/2044-3-0x0000000005A40000-0x0000000005ADC000-memory.dmp

Filesize
624KB

Download
memory/2044-8-0x00000000746B0000-0x0000000074E60000-memory.dmp

Filesize
7.7MB

Download
memory/5024-13-0x0000000074600000-0x0000000074DB0000-memory.dmp

Filesize
7.7MB

Download
memory/5024-14-0x0000000074600000-0x0000000074DB0000-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