asyncrat | 380afcca7c0cfc3e015be647a0b46fa4a2b56a213d8428db3a6503a737b2a0f9

Analysis

max time kernel
151s
max time network
161s
platform
windows10-2004_x64
resource
win10v2004-20220414-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 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/2200-140-0x0000000000680000-0x0000000000692000-memory.dmp	asyncrat
C:\Users\Admin\AppData\Roaming\win.exe	asyncrat
C:\Users\Admin\AppData\Roaming\win.exe	asyncrat

Blocklisted process makes network request 5 IoCs

Processes:

wscript.exe

flow pid process

17 1656 wscript.exe
34 1656 wscript.exe
51 1656 wscript.exe
66 1656 wscript.exe
74 1656 wscript.exe
Executes dropped EXE 2 IoCs

Processes:

AsyncClient.exewin.exe

pid process

2200 AsyncClient.exe
3852 win.exe

flow	pid	process
17	1656	wscript.exe
34	1656	wscript.exe
51	1656	wscript.exe
66	1656	wscript.exe
74	1656	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-1-5-21-3751123196-3323558407-1869646069-1000\Control Panel\International\Geo\Nation	wscript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\Control Panel\International\Geo\Nation	wscript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\Control Panel\International\Geo\Nation	wscript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\Control Panel\International\Geo\Nation	AsyncClient.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

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
Set value (str)	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\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-1-5-21-3751123196-3323558407-1869646069-1000\software\microsoft\windows\currentversion\run	wscript.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\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-1-5-21-3751123196-3323558407-1869646069-1000\software\microsoft\windows\currentversion\run	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

4528 schtasks.exe
Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

4076 timeout.exe

pid	process
4528	schtasks.exe

pid	process
4076	timeout.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

Processes:

AsyncClient.exe

pid	process
2200	AsyncClient.exe
2200	AsyncClient.exe
2200	AsyncClient.exe
2200	AsyncClient.exe
2200	AsyncClient.exe
2200	AsyncClient.exe
2200	AsyncClient.exe
2200	AsyncClient.exe
2200	AsyncClient.exe
2200	AsyncClient.exe
2200	AsyncClient.exe
2200	AsyncClient.exe
2200	AsyncClient.exe
2200	AsyncClient.exe
2200	AsyncClient.exe
2200	AsyncClient.exe
2200	AsyncClient.exe
2200	AsyncClient.exe
2200	AsyncClient.exe
2200	AsyncClient.exe
2200	AsyncClient.exe
2200	AsyncClient.exe
2200	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

AsyncClient.exewin.exe

description pid process

Token: SeDebugPrivilege 2200 AsyncClient.exe
Token: SeDebugPrivilege 3852 win.exe

description	pid	process
Token: SeDebugPrivilege	2200	AsyncClient.exe
Token: SeDebugPrivilege	3852	win.exe

Suspicious use of WriteProcessMemory 24 IoCs

Processes:

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

description	pid	process	target process
PID 3764 wrote to memory of 3432	3764	wscript.exe	wscript.exe
PID 3764 wrote to memory of 3432	3764	wscript.exe	wscript.exe
PID 3764 wrote to memory of 1656	3764	wscript.exe	wscript.exe
PID 3764 wrote to memory of 1656	3764	wscript.exe	wscript.exe
PID 3432 wrote to memory of 2200	3432	wscript.exe	AsyncClient.exe
PID 3432 wrote to memory of 2200	3432	wscript.exe	AsyncClient.exe
PID 3432 wrote to memory of 2200	3432	wscript.exe	AsyncClient.exe
PID 1656 wrote to memory of 2516	1656	wscript.exe	wscript.exe
PID 1656 wrote to memory of 2516	1656	wscript.exe	wscript.exe
PID 2200 wrote to memory of 4512	2200	AsyncClient.exe	cmd.exe
PID 2200 wrote to memory of 4512	2200	AsyncClient.exe	cmd.exe
PID 2200 wrote to memory of 4512	2200	AsyncClient.exe	cmd.exe
PID 2200 wrote to memory of 5092	2200	AsyncClient.exe	cmd.exe
PID 2200 wrote to memory of 5092	2200	AsyncClient.exe	cmd.exe
PID 2200 wrote to memory of 5092	2200	AsyncClient.exe	cmd.exe
PID 4512 wrote to memory of 4528	4512	cmd.exe	schtasks.exe
PID 4512 wrote to memory of 4528	4512	cmd.exe	schtasks.exe
PID 4512 wrote to memory of 4528	4512	cmd.exe	schtasks.exe
PID 5092 wrote to memory of 4076	5092	cmd.exe	timeout.exe
PID 5092 wrote to memory of 4076	5092	cmd.exe	timeout.exe
PID 5092 wrote to memory of 4076	5092	cmd.exe	timeout.exe
PID 5092 wrote to memory of 3852	5092	cmd.exe	win.exe
PID 5092 wrote to memory of 3852	5092	cmd.exe	win.exe
PID 5092 wrote to memory of 3852	5092	cmd.exe	win.exe

C:\Windows\system32\wscript.exe
wscript.exe C:\Users\Admin\AppData\Local\Temp\558ced74df141e2e8f4a340edccd5e16.js
1⤵
- Checks computer location settings
- Drops startup file
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:3764

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:3432

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:2200

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:4512

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:4528

C:\Windows\SysWOW64\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp35A6.tmp.bat""
4⤵
- Suspicious use of WriteProcessMemory
PID:5092

C:\Windows\SysWOW64\timeout.exe
timeout 3
5⤵
- Delays execution with timeout.exe
PID:4076

C:\Users\Admin\AppData\Roaming\win.exe
"C:\Users\Admin\AppData\Roaming\win.exe"
5⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3852

C:\Windows\System32\wscript.exe
"C:\Windows\System32\wscript.exe" //B "C:\Users\Admin\AppData\Roaming\558ced74df141e2e8f4a340edccd5e16.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:1656

C:\Windows\System32\wscript.exe
"C:\Windows\System32\wscript.exe" //B "C:\Users\Admin\AppData\Roaming\WpkCGRDGea.js"
3⤵
PID:2516

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\tmp35A6.tmp.bat
Filesize
147B

MD5
1b728f835d904b9917a6c754ae15f1c4

SHA1
6aad116f42174e2848b57d50228e4afbe8cc674b

SHA256
21470733c37c7946af1b279af65e8c09c8e1abd74d523af9267f9e357201ed0b

SHA512
917bee37c6e67f8bc307b43f38efe0c7b55943b1e39cd79fc81d641fddafd409994df885f5b444283dcdc37807ec9597589d17cfccc4163ff506668260f39c5c

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
MD5
d41d8cd98f00b204e9800998ecf8427e

SHA1
da39a3ee5e6b4b0d3255bfef95601890afd80709

SHA256
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

SHA512
cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e

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/1656-132-0x0000000000000000-mapping.dmp

Download
memory/2200-140-0x0000000000680000-0x0000000000692000-memory.dmp

Filesize
72KB

Download
memory/2200-141-0x0000000002D50000-0x0000000002DEC000-memory.dmp

Filesize
624KB

Download
memory/2200-134-0x0000000000000000-mapping.dmp

Download
memory/2516-136-0x0000000000000000-mapping.dmp

Download
memory/3432-130-0x0000000000000000-mapping.dmp

Download
memory/3852-147-0x0000000000000000-mapping.dmp

Download
memory/4076-146-0x0000000000000000-mapping.dmp

Download
memory/4512-142-0x0000000000000000-mapping.dmp

Download
memory/4528-145-0x0000000000000000-mapping.dmp

Download
memory/5092-143-0x0000000000000000-mapping.dmp

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