asyncrat | 9a2bf745baf56c027d7e4d52cc7c41cc7b2748d634677384fc2d9eecdb8f7485

Analysis

max time kernel
126s
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
19-04-2023 14:45

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General

Target

XWorm-Rat-Remote-Administration-Tool--main/dnlib.exe
Size

12KB
MD5

6967b97ce4ff4524883a196a97736275
SHA1

6fdf2b9adc16b40a06bacc7db0abee917ef4abd3
SHA256

e2bddf56324addac02678a7fd8d9c3da24ad55132883ad826a1a60eaf4e4a034
SHA512

c71525d49e36975cb43535cff5176409163b14f53b644e3d161fd56f7514f0affbda051541a07d9af4cdc45a564dfad20a23584701499a0f03e531219c9f72be
SSDEEP

192:zLlo6IXsbK9CLPN0LWyJUMmYVY2QQq33WrmRaadrq8uSF3:PljIeyCLPN0CUUMme3o3mrmRJUSF

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

Default

37.18.62.18:8060

Mutex

AsyncMutex_6SI8OkPnk

Attributes

delay
3
install
true
install_file
ChromeUpdate.exe
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 6 IoCs

rat

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Local\Temp\sysfile32.exe	asyncrat
C:\Users\Admin\AppData\Local\Temp\sysfile32.exe	asyncrat
C:\Users\Admin\AppData\Local\Temp\sysfile32.exe	asyncrat
behavioral28/memory/668-178-0x0000000000010000-0x0000000000022000-memory.dmp	asyncrat
C:\Users\Admin\AppData\Roaming\ChromeUpdate.exe	asyncrat
C:\Users\Admin\AppData\Roaming\ChromeUpdate.exe	asyncrat

Downloads MZ/PE file

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

Processes:

dnlib.exesysfile32.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1529757233-3489015626-3409890339-1000\Control Panel\International\Geo\Nation	dnlib.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1529757233-3489015626-3409890339-1000\Control Panel\International\Geo\Nation	sysfile32.exe

Executes dropped EXE 3 IoCs

Processes:

x86.exesysfile32.exeChromeUpdate.exe

pid process

4524 x86.exe
668 sysfile32.exe
3744 ChromeUpdate.exe
Legitimate hosting services abused for malware hosting/C2 1 TTPs

Web Service
T1102
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

1628 schtasks.exe
Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

3224 timeout.exe
Kills process with taskkill 1 IoCs
evasion

Processes:

taskkill.exe

pid process

4684 taskkill.exe

pid	process
4524	x86.exe
668	sysfile32.exe
3744	ChromeUpdate.exe

pid	process
1628	schtasks.exe

pid	process
3224	timeout.exe

pid	process
4684	taskkill.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

Processes:

dnlib.exe

pid	process
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe
372	dnlib.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

Processes:

dnlib.exex86.exetaskkill.exesysfile32.exeChromeUpdate.exe

description	pid	process
Token: SeDebugPrivilege	372	dnlib.exe
Token: SeDebugPrivilege	4524	x86.exe
Token: SeDebugPrivilege	4684	taskkill.exe
Token: SeDebugPrivilege	668	sysfile32.exe
Token: SeDebugPrivilege	3744	ChromeUpdate.exe

Suspicious use of SetWindowsHookEx 2 IoCs

Processes:

dnlib.exe

pid process

372 dnlib.exe
372 dnlib.exe

Suspicious use of WriteProcessMemory 20 IoCs

Processes:

dnlib.exesysfile32.execmd.execmd.exe

description	pid	process	target process
PID 372 wrote to memory of 4496	372	dnlib.exe	cmstp.exe
PID 372 wrote to memory of 4496	372	dnlib.exe	cmstp.exe
PID 372 wrote to memory of 668	372	dnlib.exe	sysfile32.exe
PID 372 wrote to memory of 668	372	dnlib.exe	sysfile32.exe
PID 372 wrote to memory of 668	372	dnlib.exe	sysfile32.exe
PID 668 wrote to memory of 784	668	sysfile32.exe	cmd.exe
PID 668 wrote to memory of 784	668	sysfile32.exe	cmd.exe
PID 668 wrote to memory of 784	668	sysfile32.exe	cmd.exe
PID 668 wrote to memory of 1552	668	sysfile32.exe	cmd.exe
PID 668 wrote to memory of 1552	668	sysfile32.exe	cmd.exe
PID 668 wrote to memory of 1552	668	sysfile32.exe	cmd.exe
PID 784 wrote to memory of 1628	784	cmd.exe	schtasks.exe
PID 784 wrote to memory of 1628	784	cmd.exe	schtasks.exe
PID 784 wrote to memory of 1628	784	cmd.exe	schtasks.exe
PID 1552 wrote to memory of 3224	1552	cmd.exe	timeout.exe
PID 1552 wrote to memory of 3224	1552	cmd.exe	timeout.exe
PID 1552 wrote to memory of 3224	1552	cmd.exe	timeout.exe
PID 1552 wrote to memory of 3744	1552	cmd.exe	ChromeUpdate.exe
PID 1552 wrote to memory of 3744	1552	cmd.exe	ChromeUpdate.exe
PID 1552 wrote to memory of 3744	1552	cmd.exe	ChromeUpdate.exe

C:\Users\Admin\AppData\Local\Temp\XWorm-Rat-Remote-Administration-Tool--main\dnlib.exe
"C:\Users\Admin\AppData\Local\Temp\XWorm-Rat-Remote-Administration-Tool--main\dnlib.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:372

\??\c:\windows\system32\cmstp.exe
"c:\windows\system32\cmstp.exe" /au C:\windows\temp\yjed03tr.inf
2⤵
PID:4496

C:\Users\Admin\AppData\Local\Temp\sysfile32.exe
"C:\Users\Admin\AppData\Local\Temp\sysfile32.exe"
2⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:668

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "ChromeUpdate" /tr '"C:\Users\Admin\AppData\Roaming\ChromeUpdate.exe"' & exit
3⤵
- Suspicious use of WriteProcessMemory
PID:784

C:\Windows\SysWOW64\schtasks.exe
schtasks /create /f /sc onlogon /rl highest /tn "ChromeUpdate" /tr '"C:\Users\Admin\AppData\Roaming\ChromeUpdate.exe"'
4⤵
- Creates scheduled task(s)
PID:1628

C:\Windows\SysWOW64\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpAA9C.tmp.bat""
3⤵
- Suspicious use of WriteProcessMemory
PID:1552

C:\Windows\SysWOW64\timeout.exe
timeout 3
4⤵
- Delays execution with timeout.exe
PID:3224

C:\Users\Admin\AppData\Roaming\ChromeUpdate.exe
"C:\Users\Admin\AppData\Roaming\ChromeUpdate.exe"
4⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3744

C:\Users\Admin\AppData\Local\Temp\x86.exe
C:\Users\Admin\AppData\Local\Temp\x86.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4524

C:\Windows\system32\taskkill.exe
taskkill /IM cmstp.exe /F
1⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:4684

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Web Service

T1102

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_pbnkipwe.knq.ps1
Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\sysfile32.exe
Filesize
49KB

MD5
9b64d05f82ebaa3e51a79c1beeed2181

SHA1
28b89cd9f181c41586b06f3e3c1f90e2270781ef

SHA256
93c7fd938042af85f3d429c387b04952f4b97832857fbf0156ae82e4f516fcf8

SHA512
580bc63ec3e6993099deae7e103f8565b42cce3288d78186f9dabea3d8e5c2e6816e1b20439fafd5b94ff24cbaa3eba1154cb995692b3674d5c5c63b6c1dfc13

Download Submit
C:\Users\Admin\AppData\Local\Temp\sysfile32.exe
Filesize
49KB

MD5
9b64d05f82ebaa3e51a79c1beeed2181

SHA1
28b89cd9f181c41586b06f3e3c1f90e2270781ef

SHA256
93c7fd938042af85f3d429c387b04952f4b97832857fbf0156ae82e4f516fcf8

SHA512
580bc63ec3e6993099deae7e103f8565b42cce3288d78186f9dabea3d8e5c2e6816e1b20439fafd5b94ff24cbaa3eba1154cb995692b3674d5c5c63b6c1dfc13

Download Submit
C:\Users\Admin\AppData\Local\Temp\sysfile32.exe
Filesize
49KB

MD5
9b64d05f82ebaa3e51a79c1beeed2181

SHA1
28b89cd9f181c41586b06f3e3c1f90e2270781ef

SHA256
93c7fd938042af85f3d429c387b04952f4b97832857fbf0156ae82e4f516fcf8

SHA512
580bc63ec3e6993099deae7e103f8565b42cce3288d78186f9dabea3d8e5c2e6816e1b20439fafd5b94ff24cbaa3eba1154cb995692b3674d5c5c63b6c1dfc13

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpAA9C.tmp.bat
Filesize
156B

MD5
e40f0b44d2654de3fca4d9d64a2212e1

SHA1
3ea42b98393fe18635f921ec9c0a3c412456ee0c

SHA256
2897f8201c2ddf7302b76117e6f2e7c88adc48e505bc662cea5e8958fca975a8

SHA512
e1438a66aa84628e1a93e14ed43b1a6778caec3e2a9b516c975ae4749b16da2bfb08974e8769669cc68268f2d100dd4f4e30a54ff605034d8a0b849eb55f8389

Download Submit
C:\Users\Admin\AppData\Local\Temp\x86.exe
Filesize
12KB

MD5
f922206889c896cf2d86f21e9f9db7db

SHA1
046b00f2edb34982db266d903627ced283f4a5ea

SHA256
1ac4832667db7044b1077e447d587a14dcd1270e71b8d34157a77d515b61c4b3

SHA512
abe82360ab14ed1e0c0c25da46a7558638671de1701e383b7a9bc122edecbc1eb13c760835a7e626a7d3ba326d4705acb53987e61d45332027913512befc4965

Download Submit
C:\Users\Admin\AppData\Local\Temp\x86.exe
Filesize
12KB

MD5
f922206889c896cf2d86f21e9f9db7db

SHA1
046b00f2edb34982db266d903627ced283f4a5ea

SHA256
1ac4832667db7044b1077e447d587a14dcd1270e71b8d34157a77d515b61c4b3

SHA512
abe82360ab14ed1e0c0c25da46a7558638671de1701e383b7a9bc122edecbc1eb13c760835a7e626a7d3ba326d4705acb53987e61d45332027913512befc4965

Download Submit
C:\Users\Admin\AppData\Roaming\ChromeUpdate.exe
Filesize
49KB

MD5
9b64d05f82ebaa3e51a79c1beeed2181

SHA1
28b89cd9f181c41586b06f3e3c1f90e2270781ef

SHA256
93c7fd938042af85f3d429c387b04952f4b97832857fbf0156ae82e4f516fcf8

SHA512
580bc63ec3e6993099deae7e103f8565b42cce3288d78186f9dabea3d8e5c2e6816e1b20439fafd5b94ff24cbaa3eba1154cb995692b3674d5c5c63b6c1dfc13

Download Submit
C:\Users\Admin\AppData\Roaming\ChromeUpdate.exe
Filesize
49KB

MD5
9b64d05f82ebaa3e51a79c1beeed2181

SHA1
28b89cd9f181c41586b06f3e3c1f90e2270781ef

SHA256
93c7fd938042af85f3d429c387b04952f4b97832857fbf0156ae82e4f516fcf8

SHA512
580bc63ec3e6993099deae7e103f8565b42cce3288d78186f9dabea3d8e5c2e6816e1b20439fafd5b94ff24cbaa3eba1154cb995692b3674d5c5c63b6c1dfc13

Download Submit
C:\windows\temp\yjed03tr.inf
Filesize
542B

MD5
5c23ac475d677288f01378eb90a7d32c

SHA1
8801e0122b4c2575bc8dcfbf04421a2c446dddf7

SHA256
7f146ed6fa2a2fbde0cda5e2afc47d4987dc62b8d3edb75d4d7341653bcefabe

SHA512
21c7ec4352e9c2c4a5472b4b5fee1372440589f27cd3f7b9bd756ce9d311b90c28fe82403cf8435119fc0ed13da03b6773f774b68128f1b280f7ecd5cafd4961

Download Submit
memory/372-144-0x000000001C050000-0x000000001C060000-memory.dmp

Filesize
64KB

Download
memory/372-151-0x000000001C050000-0x000000001C060000-memory.dmp

Filesize
64KB

Download
memory/372-150-0x000000001C050000-0x000000001C060000-memory.dmp

Filesize
64KB

Download
memory/372-133-0x0000000000880000-0x0000000000888000-memory.dmp

Filesize
32KB

Download
memory/372-143-0x000000001BFF0000-0x000000001C012000-memory.dmp

Filesize
136KB

Download
memory/668-179-0x0000000004B50000-0x0000000004B60000-memory.dmp

Filesize
64KB

Download
memory/668-180-0x0000000004D60000-0x0000000004DFC000-memory.dmp

Filesize
624KB

Download
memory/668-178-0x0000000000010000-0x0000000000022000-memory.dmp

Filesize
72KB

Download
memory/3744-189-0x0000000005050000-0x0000000005060000-memory.dmp

Filesize
64KB

Download
memory/3744-190-0x0000000005050000-0x0000000005060000-memory.dmp

Filesize
64KB

Download
memory/4524-164-0x000000001BDC0000-0x000000001BDD0000-memory.dmp

Filesize
64KB

Download
memory/4524-154-0x0000000000670000-0x0000000000678000-memory.dmp

Filesize
32KB

Download