asyncrat | 380afcca7c0cfc3e015be647a0b46fa4a2b56a213d8428db3a6503a737b2a0f9

Analysis

max time kernel
149s
max time network
153s
platform
windows7_x64
resource
win7-20220414-en
submitted
03-07-2022 04:11

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General

Target

558ced74df141e2e8f4a340edccd5e16.js
Size

197KB
MD5

308d7ff7f284eed50cb29aedc8f3bb48
SHA1

3cf054753beb7c857c198b5def3804e29f3426ff
SHA256

380afcca7c0cfc3e015be647a0b46fa4a2b56a213d8428db3a6503a737b2a0f9
SHA512

c393d34572c134d6ad6bb7b90598d04275f08f00b51d6acd2d4709df2460fe67ea347e4cd0baf8134cac9d776721f627601ea8ca9599147965220435cabac0be

Score

10^/10

asyncrat default persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

Default

franmhort.duia.ro:8153

Mutex

Mutex_6SI8OkPnk

Attributes

delay
3
install
true
install_file
win.exe
install_folder
%AppData%

aes.plain

Signatures

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

Async RAT payload 7 IoCs

rat

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Roaming\AsyncClient.exe	asyncrat
C:\Users\Admin\AppData\Roaming\AsyncClient.exe	asyncrat
behavioral1/memory/240-68-0x0000000001340000-0x0000000001352000-memory.dmp	asyncrat
\Users\Admin\AppData\Roaming\win.exe	asyncrat
C:\Users\Admin\AppData\Roaming\win.exe	asyncrat
C:\Users\Admin\AppData\Roaming\win.exe	asyncrat
behavioral1/memory/888-79-0x0000000000FD0000-0x0000000000FE2000-memory.dmp	asyncrat

Blocklisted process makes network request 6 IoCs

Processes:

wscript.exe

flow pid process

4 1272 wscript.exe
9 1272 wscript.exe
12 1272 wscript.exe
15 1272 wscript.exe
18 1272 wscript.exe
20 1272 wscript.exe
Executes dropped EXE 2 IoCs

Processes:

AsyncClient.exewin.exe

pid process

240 AsyncClient.exe
888 win.exe

flow	pid	process
4	1272	wscript.exe
9	1272	wscript.exe
12	1272	wscript.exe
15	1272	wscript.exe
18	1272	wscript.exe
20	1272	wscript.exe

pid	process
240	AsyncClient.exe
888	win.exe

Drops startup file 2 IoCs

Processes:

wscript.exewscript.exe

description	ioc	process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\558ced74df141e2e8f4a340edccd5e16.js	wscript.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\558ced74df141e2e8f4a340edccd5e16.js	wscript.exe

Loads dropped DLL 1 IoCs

Processes:

cmd.exe

pid process

568 cmd.exe

pid	process
568	cmd.exe

Adds Run key to start application 2 TTPs 8 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

wscript.exewscript.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-1819626980-2277161760-1023733287-1000\software\microsoft\windows\currentversion\run	wscript.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1819626980-2277161760-1023733287-1000\Software\Microsoft\Windows\CurrentVersion\Run\558ced74df141e2e8f4a340edccd5e16 = "wscript.exe //B \"C:\\Users\\Admin\\AppData\\Roaming\\558ced74df141e2e8f4a340edccd5e16.js\""	wscript.exe
Key created	\REGISTRY\MACHINE\software\microsoft\windows\currentversion\run	wscript.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\558ced74df141e2e8f4a340edccd5e16 = "wscript.exe //B \"C:\\Users\\Admin\\AppData\\Roaming\\558ced74df141e2e8f4a340edccd5e16.js\""	wscript.exe
Key created	\REGISTRY\USER\S-1-5-21-1819626980-2277161760-1023733287-1000\software\microsoft\windows\currentversion\run	wscript.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1819626980-2277161760-1023733287-1000\Software\Microsoft\Windows\CurrentVersion\Run\558ced74df141e2e8f4a340edccd5e16 = "wscript.exe //B \"C:\\Users\\Admin\\AppData\\Roaming\\558ced74df141e2e8f4a340edccd5e16.js\""	wscript.exe
Key created	\REGISTRY\MACHINE\software\microsoft\windows\currentversion\run	wscript.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\558ced74df141e2e8f4a340edccd5e16 = "wscript.exe //B \"C:\\Users\\Admin\\AppData\\Roaming\\558ced74df141e2e8f4a340edccd5e16.js\""	wscript.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

1760 schtasks.exe
Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

860 timeout.exe
Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

AsyncClient.exe

pid process

240 AsyncClient.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

AsyncClient.exewin.exe

description pid process

Token: SeDebugPrivilege 240 AsyncClient.exe
Token: SeDebugPrivilege 888 win.exe

pid	process
1760	schtasks.exe

pid	process
860	timeout.exe

pid	process
240	AsyncClient.exe

description	pid	process
Token: SeDebugPrivilege	240	AsyncClient.exe
Token: SeDebugPrivilege	888	win.exe

Suspicious use of WriteProcessMemory 33 IoCs

Processes:

wscript.exewscript.exewscript.exeAsyncClient.execmd.execmd.exe

description	pid	process	target process
PID 1672 wrote to memory of 988	1672	wscript.exe	wscript.exe
PID 1672 wrote to memory of 988	1672	wscript.exe	wscript.exe
PID 1672 wrote to memory of 988	1672	wscript.exe	wscript.exe
PID 1672 wrote to memory of 1272	1672	wscript.exe	wscript.exe
PID 1672 wrote to memory of 1272	1672	wscript.exe	wscript.exe
PID 1672 wrote to memory of 1272	1672	wscript.exe	wscript.exe
PID 988 wrote to memory of 240	988	wscript.exe	AsyncClient.exe
PID 988 wrote to memory of 240	988	wscript.exe	AsyncClient.exe
PID 988 wrote to memory of 240	988	wscript.exe	AsyncClient.exe
PID 988 wrote to memory of 240	988	wscript.exe	AsyncClient.exe
PID 1272 wrote to memory of 468	1272	wscript.exe	wscript.exe
PID 1272 wrote to memory of 468	1272	wscript.exe	wscript.exe
PID 1272 wrote to memory of 468	1272	wscript.exe	wscript.exe
PID 240 wrote to memory of 1464	240	AsyncClient.exe	cmd.exe
PID 240 wrote to memory of 1464	240	AsyncClient.exe	cmd.exe
PID 240 wrote to memory of 1464	240	AsyncClient.exe	cmd.exe
PID 240 wrote to memory of 1464	240	AsyncClient.exe	cmd.exe
PID 240 wrote to memory of 568	240	AsyncClient.exe	cmd.exe
PID 240 wrote to memory of 568	240	AsyncClient.exe	cmd.exe
PID 240 wrote to memory of 568	240	AsyncClient.exe	cmd.exe
PID 240 wrote to memory of 568	240	AsyncClient.exe	cmd.exe
PID 1464 wrote to memory of 1760	1464	cmd.exe	schtasks.exe
PID 1464 wrote to memory of 1760	1464	cmd.exe	schtasks.exe
PID 1464 wrote to memory of 1760	1464	cmd.exe	schtasks.exe
PID 1464 wrote to memory of 1760	1464	cmd.exe	schtasks.exe
PID 568 wrote to memory of 860	568	cmd.exe	timeout.exe
PID 568 wrote to memory of 860	568	cmd.exe	timeout.exe
PID 568 wrote to memory of 860	568	cmd.exe	timeout.exe
PID 568 wrote to memory of 860	568	cmd.exe	timeout.exe
PID 568 wrote to memory of 888	568	cmd.exe	win.exe
PID 568 wrote to memory of 888	568	cmd.exe	win.exe
PID 568 wrote to memory of 888	568	cmd.exe	win.exe
PID 568 wrote to memory of 888	568	cmd.exe	win.exe

C:\Windows\system32\wscript.exe
wscript.exe C:\Users\Admin\AppData\Local\Temp\558ced74df141e2e8f4a340edccd5e16.js
1⤵
- Drops startup file
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:1672

C:\Windows\System32\wscript.exe
"C:\Windows\System32\wscript.exe" //B "C:\Users\Admin\AppData\Roaming\WpkCGRDGea.js"
2⤵
- Suspicious use of WriteProcessMemory
PID:988

C:\Users\Admin\AppData\Roaming\AsyncClient.exe
"C:\Users\Admin\AppData\Roaming\AsyncClient.exe"
3⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:240

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "win" /tr '"C:\Users\Admin\AppData\Roaming\win.exe"' & exit
4⤵
- Suspicious use of WriteProcessMemory
PID:1464

C:\Windows\SysWOW64\schtasks.exe
schtasks /create /f /sc onlogon /rl highest /tn "win" /tr '"C:\Users\Admin\AppData\Roaming\win.exe"'
5⤵
- Creates scheduled task(s)
PID:1760

C:\Windows\SysWOW64\cmd.exe
cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp278E.tmp.bat""
4⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:568

C:\Windows\SysWOW64\timeout.exe
timeout 3
5⤵
- Delays execution with timeout.exe
PID:860

C:\Users\Admin\AppData\Roaming\win.exe
"C:\Users\Admin\AppData\Roaming\win.exe"
5⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:888

C:\Windows\System32\wscript.exe
"C:\Windows\System32\wscript.exe" //B "C:\Users\Admin\AppData\Roaming\558ced74df141e2e8f4a340edccd5e16.js"
2⤵
- Blocklisted process makes network request
- Drops startup file
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:1272

C:\Windows\System32\wscript.exe
"C:\Windows\System32\wscript.exe" //B "C:\Users\Admin\AppData\Roaming\WpkCGRDGea.js"
3⤵
PID:468

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Registry Run Keys / Startup Folder

T1060

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp278E.tmp.bat
Filesize
147B

MD5
86b17efb63022d6cff45d9269eceed22

SHA1
98c313dc7178d9e30e5af96cbc89a1f4af338b5a

SHA256
80aec571478ad1d2040eb9bb38225f52997a331ce91edeaf5cdd318232babced

SHA512
d35204215bed3180f66eea7a7fd7cea7f642ac3ac725a7509ba3b754f77b8621a6ab1e859b4d2923815abacdde4a014a41a05109e031866313042601fef4af3b

Download Submit
C:\Users\Admin\AppData\Roaming\558ced74df141e2e8f4a340edccd5e16.js
Filesize
197KB

MD5
308d7ff7f284eed50cb29aedc8f3bb48

SHA1
3cf054753beb7c857c198b5def3804e29f3426ff

SHA256
380afcca7c0cfc3e015be647a0b46fa4a2b56a213d8428db3a6503a737b2a0f9

SHA512
c393d34572c134d6ad6bb7b90598d04275f08f00b51d6acd2d4709df2460fe67ea347e4cd0baf8134cac9d776721f627601ea8ca9599147965220435cabac0be

Download Submit
C:\Users\Admin\AppData\Roaming\AsyncClient.exe
Filesize
45KB

MD5
cbdce3b5e2939fe92312004dcb31151f

SHA1
6f11f275c611decd4659f23a4593103f327806a6

SHA256
6ccc49875c2d837f462c4c3bd81f80b3be93f8435e8a22e042b5db025a31a6e3

SHA512
6240f21957016db0607987c81b110e78640d20eeba2dc0274cf6e6741cfd7924ca3b42325405e620f423157c34f355f188dbf60de96421e87f0d53e271fcc2c8

Download Submit
C:\Users\Admin\AppData\Roaming\AsyncClient.exe
Filesize
45KB

MD5
cbdce3b5e2939fe92312004dcb31151f

SHA1
6f11f275c611decd4659f23a4593103f327806a6

SHA256
6ccc49875c2d837f462c4c3bd81f80b3be93f8435e8a22e042b5db025a31a6e3

SHA512
6240f21957016db0607987c81b110e78640d20eeba2dc0274cf6e6741cfd7924ca3b42325405e620f423157c34f355f188dbf60de96421e87f0d53e271fcc2c8

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\558ced74df141e2e8f4a340edccd5e16.js
Filesize
197KB

MD5
308d7ff7f284eed50cb29aedc8f3bb48

SHA1
3cf054753beb7c857c198b5def3804e29f3426ff

SHA256
380afcca7c0cfc3e015be647a0b46fa4a2b56a213d8428db3a6503a737b2a0f9

SHA512
c393d34572c134d6ad6bb7b90598d04275f08f00b51d6acd2d4709df2460fe67ea347e4cd0baf8134cac9d776721f627601ea8ca9599147965220435cabac0be

Download Submit
C:\Users\Admin\AppData\Roaming\WpkCGRDGea.js
Filesize
90KB

MD5
18024bce1779bd2a699774f49a7ccb9e

SHA1
71d98c4b2509d40ebd128817051f8ca0271f3710

SHA256
16240be574ce82b98e9484ff2e2fcbe087f62da6f2b35eb38a67df109ee2803c

SHA512
d92c8e3b8e5b6225bd8a0f94a445fef52d012c20feccee8d4c7f3591ce6a806f83050a95780862f1acb6b18ba41a766043f9f7d1397bec0660043bb5d05696c3

Download Submit
C:\Users\Admin\AppData\Roaming\WpkCGRDGea.js
Filesize
90KB

MD5
18024bce1779bd2a699774f49a7ccb9e

SHA1
71d98c4b2509d40ebd128817051f8ca0271f3710

SHA256
16240be574ce82b98e9484ff2e2fcbe087f62da6f2b35eb38a67df109ee2803c

SHA512
d92c8e3b8e5b6225bd8a0f94a445fef52d012c20feccee8d4c7f3591ce6a806f83050a95780862f1acb6b18ba41a766043f9f7d1397bec0660043bb5d05696c3

Download Submit
C:\Users\Admin\AppData\Roaming\win.exe
Filesize
45KB

MD5
cbdce3b5e2939fe92312004dcb31151f

SHA1
6f11f275c611decd4659f23a4593103f327806a6

SHA256
6ccc49875c2d837f462c4c3bd81f80b3be93f8435e8a22e042b5db025a31a6e3

SHA512
6240f21957016db0607987c81b110e78640d20eeba2dc0274cf6e6741cfd7924ca3b42325405e620f423157c34f355f188dbf60de96421e87f0d53e271fcc2c8

Download Submit
C:\Users\Admin\AppData\Roaming\win.exe
Filesize
45KB

MD5
cbdce3b5e2939fe92312004dcb31151f

SHA1
6f11f275c611decd4659f23a4593103f327806a6

SHA256
6ccc49875c2d837f462c4c3bd81f80b3be93f8435e8a22e042b5db025a31a6e3

SHA512
6240f21957016db0607987c81b110e78640d20eeba2dc0274cf6e6741cfd7924ca3b42325405e620f423157c34f355f188dbf60de96421e87f0d53e271fcc2c8

Download Submit
\Users\Admin\AppData\Roaming\win.exe
Filesize
45KB

MD5
cbdce3b5e2939fe92312004dcb31151f

SHA1
6f11f275c611decd4659f23a4593103f327806a6

SHA256
6ccc49875c2d837f462c4c3bd81f80b3be93f8435e8a22e042b5db025a31a6e3

SHA512
6240f21957016db0607987c81b110e78640d20eeba2dc0274cf6e6741cfd7924ca3b42325405e620f423157c34f355f188dbf60de96421e87f0d53e271fcc2c8

Download Submit
memory/240-68-0x0000000001340000-0x0000000001352000-memory.dmp

Filesize
72KB

Download
memory/240-61-0x0000000000000000-mapping.dmp

Download
memory/240-69-0x0000000075B61000-0x0000000075B63000-memory.dmp

Filesize
8KB

Download
memory/468-64-0x0000000000000000-mapping.dmp

Download
memory/568-71-0x0000000000000000-mapping.dmp

Download
memory/860-74-0x0000000000000000-mapping.dmp

Download
memory/888-77-0x0000000000000000-mapping.dmp

Download
memory/888-79-0x0000000000FD0000-0x0000000000FE2000-memory.dmp

Filesize
72KB

Download
memory/988-55-0x0000000000000000-mapping.dmp

Download
memory/1272-56-0x0000000000000000-mapping.dmp

Download
memory/1464-70-0x0000000000000000-mapping.dmp

Download
memory/1672-54-0x000007FEFC0C1000-0x000007FEFC0C3000-memory.dmp

Filesize
8KB

Download
memory/1760-73-0x0000000000000000-mapping.dmp

Download