asyncrat | bf765420bbb03b49f594002013915e508160a4efede03e051075cabad32c51b3

General

Target

168ee8403709fc4848328051ff819157.exe
Size

70KB
MD5

168ee8403709fc4848328051ff819157
SHA1

bf96e4267c22e283d192e34fc50ded40802ac83c
SHA256

bf765420bbb03b49f594002013915e508160a4efede03e051075cabad32c51b3
SHA512

9e86bdb6f49881fc39a1cea97047164dc02e21cb8bfc43526997840effcde497c3411bfed256fce7738f3b3a3814d1fb8f4295cec09034453aff326cf97a449c
SSDEEP

1536:L2pM3Poamv/TQ6MLXIRakKVyreBOPew0ikXx5utYdsOWg+7/MajDw:iW3ADXcBURL4OmikXbuuVA/Rw

Score

10^/10

asyncrat default collection persistence rat spyware stealer

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

Default

C2

20.171.107.243:6606

20.171.107.243:7707

20.171.107.243:8808

rositxado.tk:6606

rositxado.tk:7707

rositxado.tk:8808

Mutex

AsyncMutex_6SI8OkPnk

Attributes

delay
3
install
false
install_folder
%AppData%

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers.
rat asyncrat

Async RAT payload 1 IoCs

rat

Processes:

resource	yara_rule
behavioral2/memory/2756-141-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

Processes:

RegAsm.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe
Key opened	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe
Key opened	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

powershell.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\HWMonitor = "C:\\Users\\Admin\\AppData\\Roaming\\vlc\\HWMonitor.exe"	powershell.exe

Looks up external IP address via web service 2 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow ioc

38 ip-api.com
30 icanhazip.com
Suspicious use of SetThreadContext 1 IoCs

Processes:

168ee8403709fc4848328051ff819157.exe

description pid process target process

PID 2492 set thread context of 2756 2492 168ee8403709fc4848328051ff819157.exe RegAsm.exe

flow	ioc
38	ip-api.com
30	icanhazip.com

description	pid	process	target process
PID 2492 set thread context of 2756	2492	168ee8403709fc4848328051ff819157.exe	RegAsm.exe

Checks processor information in registry 2 TTPs 2 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

Processes:

RegAsm.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\HARDWARE\Description\System\CentralProcessor\0	RegAsm.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	RegAsm.exe

Suspicious behavior: EnumeratesProcesses 26 IoCs

Processes:

powershell.exeRegAsm.exe

pid	process
2640	powershell.exe
2640	powershell.exe
2756	RegAsm.exe
2756	RegAsm.exe
2756	RegAsm.exe
2756	RegAsm.exe
2756	RegAsm.exe
2756	RegAsm.exe
2756	RegAsm.exe
2756	RegAsm.exe
2756	RegAsm.exe
2756	RegAsm.exe
2756	RegAsm.exe
2756	RegAsm.exe
2756	RegAsm.exe
2756	RegAsm.exe
2756	RegAsm.exe
2756	RegAsm.exe
2756	RegAsm.exe
2756	RegAsm.exe
2756	RegAsm.exe
2756	RegAsm.exe
2756	RegAsm.exe
2756	RegAsm.exe
2756	RegAsm.exe
2756	RegAsm.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

powershell.exeRegAsm.exemsiexec.exe

description pid process

Token: SeDebugPrivilege 2640 powershell.exe
Token: SeDebugPrivilege 2756 RegAsm.exe
Token: SeSecurityPrivilege 4112 msiexec.exe

description	pid	process
Token: SeDebugPrivilege	2640	powershell.exe
Token: SeDebugPrivilege	2756	RegAsm.exe
Token: SeSecurityPrivilege	4112	msiexec.exe

Suspicious use of WriteProcessMemory 32 IoCs

Processes:

168ee8403709fc4848328051ff819157.exeRegAsm.execmd.execmd.exe

description	pid	process	target process
PID 2492 wrote to memory of 2640	2492	168ee8403709fc4848328051ff819157.exe	powershell.exe
PID 2492 wrote to memory of 2640	2492	168ee8403709fc4848328051ff819157.exe	powershell.exe
PID 2492 wrote to memory of 2640	2492	168ee8403709fc4848328051ff819157.exe	powershell.exe
PID 2492 wrote to memory of 2756	2492	168ee8403709fc4848328051ff819157.exe	RegAsm.exe
PID 2492 wrote to memory of 2756	2492	168ee8403709fc4848328051ff819157.exe	RegAsm.exe
PID 2492 wrote to memory of 2756	2492	168ee8403709fc4848328051ff819157.exe	RegAsm.exe
PID 2492 wrote to memory of 2756	2492	168ee8403709fc4848328051ff819157.exe	RegAsm.exe
PID 2492 wrote to memory of 2756	2492	168ee8403709fc4848328051ff819157.exe	RegAsm.exe
PID 2492 wrote to memory of 2756	2492	168ee8403709fc4848328051ff819157.exe	RegAsm.exe
PID 2492 wrote to memory of 2756	2492	168ee8403709fc4848328051ff819157.exe	RegAsm.exe
PID 2492 wrote to memory of 2756	2492	168ee8403709fc4848328051ff819157.exe	RegAsm.exe
PID 2756 wrote to memory of 3768	2756	RegAsm.exe	cmd.exe
PID 2756 wrote to memory of 3768	2756	RegAsm.exe	cmd.exe
PID 2756 wrote to memory of 3768	2756	RegAsm.exe	cmd.exe
PID 3768 wrote to memory of 4800	3768	cmd.exe	chcp.com
PID 3768 wrote to memory of 4800	3768	cmd.exe	chcp.com
PID 3768 wrote to memory of 4800	3768	cmd.exe	chcp.com
PID 3768 wrote to memory of 380	3768	cmd.exe	netsh.exe
PID 3768 wrote to memory of 380	3768	cmd.exe	netsh.exe
PID 3768 wrote to memory of 380	3768	cmd.exe	netsh.exe
PID 3768 wrote to memory of 4648	3768	cmd.exe	findstr.exe
PID 3768 wrote to memory of 4648	3768	cmd.exe	findstr.exe
PID 3768 wrote to memory of 4648	3768	cmd.exe	findstr.exe
PID 2756 wrote to memory of 2992	2756	RegAsm.exe	cmd.exe
PID 2756 wrote to memory of 2992	2756	RegAsm.exe	cmd.exe
PID 2756 wrote to memory of 2992	2756	RegAsm.exe	cmd.exe
PID 2992 wrote to memory of 396	2992	cmd.exe	chcp.com
PID 2992 wrote to memory of 396	2992	cmd.exe	chcp.com
PID 2992 wrote to memory of 396	2992	cmd.exe	chcp.com
PID 2992 wrote to memory of 1500	2992	cmd.exe	netsh.exe
PID 2992 wrote to memory of 1500	2992	cmd.exe	netsh.exe
PID 2992 wrote to memory of 1500	2992	cmd.exe	netsh.exe

outlook_office_path 1 IoCs

Processes:

RegAsm.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe

outlook_win_path 1 IoCs

Processes:

RegAsm.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe

C:\Users\Admin\AppData\Local\Temp\168ee8403709fc4848328051ff819157.exe
"C:\Users\Admin\AppData\Local\Temp\168ee8403709fc4848328051ff819157.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2492

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
"powershell.exe" Remove-ItemProperty -Path 'HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Run' -Name 'HWMonitor';New-ItemProperty -Path 'HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Run' -Name 'HWMonitor' -Value '"C:\Users\Admin\AppData\Roaming\vlc\HWMonitor.exe"' -PropertyType 'String'
2⤵
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2640

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
2⤵
- Accesses Microsoft Outlook profiles
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- outlook_office_path
- outlook_win_path
PID:2756

C:\Windows\SysWOW64\cmd.exe
"cmd.exe" /C chcp 65001 && netsh wlan show profile | findstr All
3⤵
- Suspicious use of WriteProcessMemory
PID:3768

C:\Windows\SysWOW64\chcp.com
chcp 65001
4⤵
PID:4800

C:\Windows\SysWOW64\netsh.exe
netsh wlan show profile
4⤵
PID:380

C:\Windows\SysWOW64\findstr.exe
findstr All
4⤵
PID:4648

C:\Windows\SysWOW64\cmd.exe
"cmd.exe" /C chcp 65001 && netsh wlan show networks mode=bssid
3⤵
- Suspicious use of WriteProcessMemory
PID:2992

C:\Windows\SysWOW64\chcp.com
chcp 65001
4⤵
PID:396

C:\Windows\SysWOW64\netsh.exe
netsh wlan show networks mode=bssid
4⤵
PID:1500

C:\Windows\system32\msiexec.exe
C:\Windows\system32\msiexec.exe /V
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:4112

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Credentials in Files

1

T1081

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Email Collection

1

T1114

Exfiltration

Command and Control

Impact

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Downloads

memory/380-153-0x0000000000000000-mapping.dmp

Download
memory/396-156-0x0000000000000000-mapping.dmp

Download
memory/1500-157-0x0000000000000000-mapping.dmp

Download
memory/2492-132-0x00000000000F0000-0x0000000000108000-memory.dmp

Filesize
96KB

Download
memory/2492-133-0x0000000005130000-0x00000000056D4000-memory.dmp

Filesize
5.6MB

Download
memory/2492-134-0x0000000004AB0000-0x0000000004B42000-memory.dmp

Filesize
584KB

Download
memory/2492-135-0x0000000004B50000-0x0000000004B5A000-memory.dmp

Filesize
40KB

Download
memory/2492-136-0x0000000004C40000-0x0000000004CB6000-memory.dmp

Filesize
472KB

Download
memory/2492-137-0x0000000004CC0000-0x0000000004CDE000-memory.dmp

Filesize
120KB

Download
memory/2640-144-0x0000000005D90000-0x0000000005DF6000-memory.dmp

Filesize
408KB

Download
memory/2640-140-0x0000000004EB0000-0x0000000004EE6000-memory.dmp

Filesize
216KB

Download
memory/2640-143-0x0000000005CF0000-0x0000000005D12000-memory.dmp

Filesize
136KB

Download
memory/2640-138-0x0000000000000000-mapping.dmp

Download
memory/2640-145-0x0000000005E70000-0x0000000005ED6000-memory.dmp

Filesize
408KB

Download
memory/2640-146-0x0000000006460000-0x000000000647E000-memory.dmp

Filesize
120KB

Download
memory/2640-147-0x00000000069D0000-0x0000000006A66000-memory.dmp

Filesize
600KB

Download
memory/2640-148-0x0000000006950000-0x000000000696A000-memory.dmp

Filesize
104KB

Download
memory/2640-149-0x00000000069A0000-0x00000000069C2000-memory.dmp

Filesize
136KB

Download
memory/2640-142-0x0000000005610000-0x0000000005C38000-memory.dmp

Filesize
6.2MB

Download
memory/2756-150-0x0000000005C40000-0x0000000005CDC000-memory.dmp

Filesize
624KB

Download
memory/2756-139-0x0000000000000000-mapping.dmp

Download
memory/2756-141-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2992-155-0x0000000000000000-mapping.dmp

Download
memory/3768-151-0x0000000000000000-mapping.dmp

Download
memory/4648-154-0x0000000000000000-mapping.dmp

Download
memory/4800-152-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads