asyncrat | b090d245e1cc85444c011b6b6c9c73dfa85f8e1ff5f3449d2e807552c7db6f7d

Analysis

max time kernel
152s
max time network
162s
platform
windows10-2004_x64
resource
win10v2004-20220414-en
submitted
01-07-2022 09:52

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General

Target

RFQ-PO#20222906.js
Size

197KB
MD5

558ced74df141e2e8f4a340edccd5e16
SHA1

09e29290df81916a3621bcde3c467b1af2228a24
SHA256

b090d245e1cc85444c011b6b6c9c73dfa85f8e1ff5f3449d2e807552c7db6f7d
SHA512

9ffc284caf3c745831b38445cfed7c664559bfb0f86348c844fc0ab4542180c7389efe61c3f0f9aeb7dbe398f7a8b147d9d0e69b3da3d9d080fea35458d4f3be

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 5 IoCs

rat

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Roaming\AsyncClient.exe	asyncrat
C:\Users\Admin\AppData\Roaming\AsyncClient.exe	asyncrat
behavioral2/memory/4764-140-0x00000000001E0000-0x00000000001F2000-memory.dmp	asyncrat
C:\Users\Admin\AppData\Roaming\win.exe	asyncrat
C:\Users\Admin\AppData\Roaming\win.exe	asyncrat

Blocklisted process makes network request 6 IoCs

Processes:

wscript.exe

flow pid process

6 1444 wscript.exe
13 1444 wscript.exe
38 1444 wscript.exe
45 1444 wscript.exe
51 1444 wscript.exe
57 1444 wscript.exe
Executes dropped EXE 2 IoCs

Processes:

AsyncClient.exewin.exe

pid process

4764 AsyncClient.exe
2520 win.exe

flow	pid	process
6	1444	wscript.exe
13	1444	wscript.exe
38	1444	wscript.exe
45	1444	wscript.exe
51	1444	wscript.exe
57	1444	wscript.exe

Checks computer location settings 2 TTPs 4 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

Processes:

wscript.exewscript.exewscript.exeAsyncClient.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1081944012-3634099177-1681222835-1000\Control Panel\International\Geo\Nation	wscript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1081944012-3634099177-1681222835-1000\Control Panel\International\Geo\Nation	wscript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1081944012-3634099177-1681222835-1000\Control Panel\International\Geo\Nation	wscript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1081944012-3634099177-1681222835-1000\Control Panel\International\Geo\Nation	AsyncClient.exe

Drops startup file 2 IoCs

Processes:

wscript.exewscript.exe

description	ioc	process
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\RFQ-PO#20222906.js	wscript.exe
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\RFQ-PO#20222906.js	wscript.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-1-5-21-1081944012-3634099177-1681222835-1000\software\microsoft\windows\currentversion\run	wscript.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1081944012-3634099177-1681222835-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\RFQ-PO#20222906 = "wscript.exe //B \"C:\\Users\\Admin\\AppData\\Roaming\\RFQ-PO#20222906.js\""	wscript.exe
Key created	\REGISTRY\MACHINE\software\microsoft\windows\currentversion\run	wscript.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\RFQ-PO#20222906 = "wscript.exe //B \"C:\\Users\\Admin\\AppData\\Roaming\\RFQ-PO#20222906.js\""	wscript.exe
Key created	\REGISTRY\USER\S-1-5-21-1081944012-3634099177-1681222835-1000\software\microsoft\windows\currentversion\run	wscript.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1081944012-3634099177-1681222835-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\RFQ-PO#20222906 = "wscript.exe //B \"C:\\Users\\Admin\\AppData\\Roaming\\RFQ-PO#20222906.js\""	wscript.exe
Key created	\REGISTRY\MACHINE\software\microsoft\windows\currentversion\run	wscript.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\RFQ-PO#20222906 = "wscript.exe //B \"C:\\Users\\Admin\\AppData\\Roaming\\RFQ-PO#20222906.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

4120 schtasks.exe
Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

4296 timeout.exe

pid	process
4120	schtasks.exe

pid	process
4296	timeout.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

Processes:

AsyncClient.exe

pid	process
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

AsyncClient.exewin.exe

description pid process

Token: SeDebugPrivilege 4764 AsyncClient.exe
Token: SeDebugPrivilege 2520 win.exe

description	pid	process
Token: SeDebugPrivilege	4764	AsyncClient.exe
Token: SeDebugPrivilege	2520	win.exe

Suspicious use of WriteProcessMemory 24 IoCs

Processes:

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

description	pid	process	target process
PID 4108 wrote to memory of 3964	4108	wscript.exe	wscript.exe
PID 4108 wrote to memory of 3964	4108	wscript.exe	wscript.exe
PID 4108 wrote to memory of 1444	4108	wscript.exe	wscript.exe
PID 4108 wrote to memory of 1444	4108	wscript.exe	wscript.exe
PID 1444 wrote to memory of 1276	1444	wscript.exe	wscript.exe
PID 1444 wrote to memory of 1276	1444	wscript.exe	wscript.exe
PID 3964 wrote to memory of 4764	3964	wscript.exe	AsyncClient.exe
PID 3964 wrote to memory of 4764	3964	wscript.exe	AsyncClient.exe
PID 3964 wrote to memory of 4764	3964	wscript.exe	AsyncClient.exe
PID 4764 wrote to memory of 2644	4764	AsyncClient.exe	cmd.exe
PID 4764 wrote to memory of 2644	4764	AsyncClient.exe	cmd.exe
PID 4764 wrote to memory of 2644	4764	AsyncClient.exe	cmd.exe
PID 4764 wrote to memory of 4308	4764	AsyncClient.exe	cmd.exe
PID 4764 wrote to memory of 4308	4764	AsyncClient.exe	cmd.exe
PID 4764 wrote to memory of 4308	4764	AsyncClient.exe	cmd.exe
PID 4308 wrote to memory of 4296	4308	cmd.exe	timeout.exe
PID 4308 wrote to memory of 4296	4308	cmd.exe	timeout.exe
PID 4308 wrote to memory of 4296	4308	cmd.exe	timeout.exe
PID 2644 wrote to memory of 4120	2644	cmd.exe	schtasks.exe
PID 2644 wrote to memory of 4120	2644	cmd.exe	schtasks.exe
PID 2644 wrote to memory of 4120	2644	cmd.exe	schtasks.exe
PID 4308 wrote to memory of 2520	4308	cmd.exe	win.exe
PID 4308 wrote to memory of 2520	4308	cmd.exe	win.exe
PID 4308 wrote to memory of 2520	4308	cmd.exe	win.exe

C:\Windows\system32\wscript.exe
wscript.exe C:\Users\Admin\AppData\Local\Temp\RFQ-PO#20222906.js
1⤵
- Checks computer location settings
- Drops startup file
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:4108

C:\Windows\System32\wscript.exe
"C:\Windows\System32\wscript.exe" //B "C:\Users\Admin\AppData\Roaming\WpkCGRDGea.js"
2⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3964

C:\Users\Admin\AppData\Roaming\AsyncClient.exe
"C:\Users\Admin\AppData\Roaming\AsyncClient.exe"
3⤵
- Executes dropped EXE
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4764

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:2644

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:4120

C:\Windows\SysWOW64\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpB46B.tmp.bat""
4⤵
- Suspicious use of WriteProcessMemory
PID:4308

C:\Windows\SysWOW64\timeout.exe
timeout 3
5⤵
- Delays execution with timeout.exe
PID:4296

C:\Users\Admin\AppData\Roaming\win.exe
"C:\Users\Admin\AppData\Roaming\win.exe"
5⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2520

C:\Windows\System32\wscript.exe
"C:\Windows\System32\wscript.exe" //B "C:\Users\Admin\AppData\Roaming\RFQ-PO#20222906.js"
2⤵
- Blocklisted process makes network request
- Checks computer location settings
- Drops startup file
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:1444

C:\Windows\System32\wscript.exe
"C:\Windows\System32\wscript.exe" //B "C:\Users\Admin\AppData\Roaming\WpkCGRDGea.js"
3⤵
PID:1276

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

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpB46B.tmp.bat
Filesize
147B

MD5
fefc9f69d97eb3d7d886ca7a192bf4a8

SHA1
9ef9f1efd00d9c2e09d6733344f8aa13e78f4572

SHA256
87bcc95d6ecfcbb6d1dc9ef7fea41d5f45460d88112a94020476ce91ec177fd6

SHA512
b2bbd1d287d6f6c48e9afd7b22dacf1937f1ecf9b5efc475357be89fc3e26e248085292d1e25d561d354422632a8dad09dd9608da5febbe3816a0f8a754aa647

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\RFQ-PO#20222906.js
MD5
d41d8cd98f00b204e9800998ecf8427e

SHA1
da39a3ee5e6b4b0d3255bfef95601890afd80709

SHA256
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

SHA512
cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e

Download Submit
C:\Users\Admin\AppData\Roaming\RFQ-PO#20222906.js
Filesize
197KB

MD5
558ced74df141e2e8f4a340edccd5e16

SHA1
09e29290df81916a3621bcde3c467b1af2228a24

SHA256
b090d245e1cc85444c011b6b6c9c73dfa85f8e1ff5f3449d2e807552c7db6f7d

SHA512
9ffc284caf3c745831b38445cfed7c664559bfb0f86348c844fc0ab4542180c7389efe61c3f0f9aeb7dbe398f7a8b147d9d0e69b3da3d9d080fea35458d4f3be

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
memory/1276-134-0x0000000000000000-mapping.dmp

Download
memory/1444-132-0x0000000000000000-mapping.dmp

Download
memory/2520-147-0x0000000000000000-mapping.dmp

Download
memory/2644-142-0x0000000000000000-mapping.dmp

Download
memory/3964-130-0x0000000000000000-mapping.dmp

Download
memory/4120-146-0x0000000000000000-mapping.dmp

Download
memory/4296-145-0x0000000000000000-mapping.dmp

Download
memory/4308-143-0x0000000000000000-mapping.dmp

Download
memory/4764-141-0x0000000004C70000-0x0000000004D0C000-memory.dmp

Filesize
624KB

Download
memory/4764-140-0x00000000001E0000-0x00000000001F2000-memory.dmp

Filesize
72KB

Download
memory/4764-137-0x0000000000000000-mapping.dmp

Download