asyncrat | 92f7bd1fed09000ed86f84f0f83e81050320b9551fc3683aef4872ee6f9c3fd3

Analysis

max time kernel
187s
max time network
192s
platform
windows7_x64
resource
win7-20220414-en
submitted
01-07-2022 09:52

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General

Target

PO_2018251-2693.js
Size

485KB
MD5

5fb3d78208c1d07e6885f33487e36897
SHA1

cbbdeeab3106f915e8dbf682bd86e4fe8ece677d
SHA256

92f7bd1fed09000ed86f84f0f83e81050320b9551fc3683aef4872ee6f9c3fd3
SHA512

e10866a0bac222f32136a871d249e37cf11e89d66ea24c7e92e5cf0e4bf967ce6447eb869c59aadf242141b1fca9b9fb9f91f068cbb4d5af08022874951d6965

Score

10^/10

asyncrat formbook xloader default vs8g loader persistence rat spyware stealer suricata trojan

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

Extracted

Family

xloader

Version

2.9

Campaign

vs8g

Decoy

xEVEsySadSMf8UUC

H8ZbYtGKWPCfp91+uS3TFo/F7tYacwDqHw==

L/St5UjIhTMzEHsb

8h8tDvq0nl8JCWoagxa0MVyvnA==

7bml44z9jZsZx8Co2T8=

EwH88ZtcOu8ehs2P2o6wv78FEe4+xRQ=

bTn3LpE1HfpPAXI=

nYxT+9GLhS1d3zzGJuTDlgpT

HxonIwh8TesenMCo2T8=

Ki83MiehhC9e1i7YQ/Wd32JsGcun

wHcUByFRMuEGh8Co2T8=

86tqpg/Jy60eFmMRPefDlgpT

grSUYa5yahUf8UUC

HVviVsk7Cb6Elc571pnSWCJ93G17PkiI

6LJ1qBPUtGNIl8Co2T8=

AYuWD33xt44VxsCo2T8=

/smXvLMh868VzQqs99/DlgpT

1kEMNVtaMw6KmN+YANYm+kA=

daarti3nbFVKnsCo2T8=

0EJM6cFFHvawA2U=

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers.
rat asyncrat
Formbook
Formbook is a data stealing malware which is capable of stealing data.
trojan spyware stealer formbook
Xloader
Xloader is a rebranded version of Formbook malware.
loader xloader
suricata: ET MALWARE FormBook CnC Checkin (GET)
suricata: ET MALWARE FormBook CnC Checkin (GET)
suricata

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/1920-67-0x0000000000F30000-0x0000000000F42000-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/1776-88-0x00000000002B0000-0x00000000002C2000-memory.dmp	asyncrat

Xloader Payload 4 IoCs

rat

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Local\Temp\bin.exe	xloader
C:\Users\Admin\AppData\Local\Temp\bin.exe	xloader
behavioral1/memory/2012-71-0x0000000000080000-0x00000000000AC000-memory.dmp	xloader
behavioral1/memory/2012-76-0x0000000000080000-0x00000000000AC000-memory.dmp	xloader

Adds policy Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

wlanext.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\XTX8YFW06F5 = "C:\\Program Files (x86)\\Rhtnlwb\\gdibdg.exe"	wlanext.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	wlanext.exe

Executes dropped EXE 3 IoCs

Processes:

bin.exeAsyncClient.exewin.exe

pid process

1796 bin.exe
1920 AsyncClient.exe
1776 win.exe
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:

bin.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Control Panel\International\Geo\Nation bin.exe
Loads dropped DLL 1 IoCs

Processes:

cmd.exe

pid process

1980 cmd.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Control Panel\International\Geo\Nation	bin.exe

pid	process
1980	cmd.exe

Suspicious use of SetThreadContext 2 IoCs

Processes:

bin.exewlanext.exe

description	pid	process	target process
PID 1796 set thread context of 1268	1796	bin.exe	Explorer.EXE
PID 2012 set thread context of 1268	2012	wlanext.exe	Explorer.EXE

Drops file in Program Files directory 1 IoCs

Processes:

wlanext.exe

description ioc process

File opened for modification C:\Program Files (x86)\Rhtnlwb\gdibdg.exe wlanext.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

1740 schtasks.exe
Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

1484 timeout.exe

description	ioc	process
File opened for modification	C:\Program Files (x86)\Rhtnlwb\gdibdg.exe	wlanext.exe

pid	process
1740	schtasks.exe

pid	process
1484	timeout.exe

Modifies Internet Explorer settings 1 TTPs 1 IoCs

adware spyware

Modify Registry

T1112

Processes:

wlanext.exe

description	ioc	process
Key created	\Registry\User\S-1-5-21-2277218442-1199762539-2004043321-1000\SOFTWARE\Microsoft\Internet Explorer\IntelliForms\Storage2	wlanext.exe

Suspicious behavior: EnumeratesProcesses 24 IoCs

Processes:

bin.exewlanext.exeAsyncClient.exe

pid	process
1796	bin.exe
1796	bin.exe
2012	wlanext.exe
2012	wlanext.exe
2012	wlanext.exe
2012	wlanext.exe
2012	wlanext.exe
2012	wlanext.exe
2012	wlanext.exe
1920	AsyncClient.exe
2012	wlanext.exe
2012	wlanext.exe
2012	wlanext.exe
2012	wlanext.exe
2012	wlanext.exe
2012	wlanext.exe
2012	wlanext.exe
2012	wlanext.exe
2012	wlanext.exe
2012	wlanext.exe
2012	wlanext.exe
2012	wlanext.exe
2012	wlanext.exe
2012	wlanext.exe

Suspicious behavior: MapViewOfSection 7 IoCs

Processes:

bin.exewlanext.exe

pid process

1796 bin.exe
1796 bin.exe
1796 bin.exe
2012 wlanext.exe
2012 wlanext.exe
2012 wlanext.exe
2012 wlanext.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

Processes:

bin.exewlanext.exeAsyncClient.exewin.exeExplorer.EXE

description	pid	process
Token: SeDebugPrivilege	1796	bin.exe
Token: SeDebugPrivilege	2012	wlanext.exe
Token: SeDebugPrivilege	1920	AsyncClient.exe
Token: SeDebugPrivilege	1776	win.exe
Token: SeShutdownPrivilege	1268	Explorer.EXE

Suspicious use of FindShellTrayWindow 2 IoCs

Processes:

Explorer.EXE

pid process

1268 Explorer.EXE
1268 Explorer.EXE
Suspicious use of SendNotifyMessage 2 IoCs

Processes:

Explorer.EXE

pid process

1268 Explorer.EXE
1268 Explorer.EXE

pid	process
1268	Explorer.EXE
1268	Explorer.EXE

pid	process
1268	Explorer.EXE
1268	Explorer.EXE

Suspicious use of WriteProcessMemory 44 IoCs

Processes:

wscript.exewscript.exeExplorer.EXEwlanext.exeAsyncClient.execmd.execmd.exe

description	pid	process	target process
PID 936 wrote to memory of 1996	936	wscript.exe	wscript.exe
PID 936 wrote to memory of 1996	936	wscript.exe	wscript.exe
PID 936 wrote to memory of 1996	936	wscript.exe	wscript.exe
PID 936 wrote to memory of 1796	936	wscript.exe	bin.exe
PID 936 wrote to memory of 1796	936	wscript.exe	bin.exe
PID 936 wrote to memory of 1796	936	wscript.exe	bin.exe
PID 936 wrote to memory of 1796	936	wscript.exe	bin.exe
PID 1996 wrote to memory of 1920	1996	wscript.exe	AsyncClient.exe
PID 1996 wrote to memory of 1920	1996	wscript.exe	AsyncClient.exe
PID 1996 wrote to memory of 1920	1996	wscript.exe	AsyncClient.exe
PID 1996 wrote to memory of 1920	1996	wscript.exe	AsyncClient.exe
PID 1268 wrote to memory of 2012	1268	Explorer.EXE	wlanext.exe
PID 1268 wrote to memory of 2012	1268	Explorer.EXE	wlanext.exe
PID 1268 wrote to memory of 2012	1268	Explorer.EXE	wlanext.exe
PID 1268 wrote to memory of 2012	1268	Explorer.EXE	wlanext.exe
PID 2012 wrote to memory of 1336	2012	wlanext.exe	cmd.exe
PID 2012 wrote to memory of 1336	2012	wlanext.exe	cmd.exe
PID 2012 wrote to memory of 1336	2012	wlanext.exe	cmd.exe
PID 2012 wrote to memory of 1336	2012	wlanext.exe	cmd.exe
PID 1920 wrote to memory of 1924	1920	AsyncClient.exe	cmd.exe
PID 1920 wrote to memory of 1924	1920	AsyncClient.exe	cmd.exe
PID 1920 wrote to memory of 1924	1920	AsyncClient.exe	cmd.exe
PID 1920 wrote to memory of 1924	1920	AsyncClient.exe	cmd.exe
PID 1924 wrote to memory of 1740	1924	cmd.exe	schtasks.exe
PID 1924 wrote to memory of 1740	1924	cmd.exe	schtasks.exe
PID 1924 wrote to memory of 1740	1924	cmd.exe	schtasks.exe
PID 1924 wrote to memory of 1740	1924	cmd.exe	schtasks.exe
PID 1920 wrote to memory of 1980	1920	AsyncClient.exe	cmd.exe
PID 1920 wrote to memory of 1980	1920	AsyncClient.exe	cmd.exe
PID 1920 wrote to memory of 1980	1920	AsyncClient.exe	cmd.exe
PID 1920 wrote to memory of 1980	1920	AsyncClient.exe	cmd.exe
PID 1980 wrote to memory of 1484	1980	cmd.exe	timeout.exe
PID 1980 wrote to memory of 1484	1980	cmd.exe	timeout.exe
PID 1980 wrote to memory of 1484	1980	cmd.exe	timeout.exe
PID 1980 wrote to memory of 1484	1980	cmd.exe	timeout.exe
PID 1980 wrote to memory of 1776	1980	cmd.exe	win.exe
PID 1980 wrote to memory of 1776	1980	cmd.exe	win.exe
PID 1980 wrote to memory of 1776	1980	cmd.exe	win.exe
PID 1980 wrote to memory of 1776	1980	cmd.exe	win.exe
PID 2012 wrote to memory of 1992	2012	wlanext.exe	Firefox.exe
PID 2012 wrote to memory of 1992	2012	wlanext.exe	Firefox.exe
PID 2012 wrote to memory of 1992	2012	wlanext.exe	Firefox.exe
PID 2012 wrote to memory of 1992	2012	wlanext.exe	Firefox.exe
PID 2012 wrote to memory of 1992	2012	wlanext.exe	Firefox.exe

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:1268

C:\Windows\system32\wscript.exe
wscript.exe C:\Users\Admin\AppData\Local\Temp\PO_2018251-2693.js
2⤵
- Suspicious use of WriteProcessMemory
PID:936

C:\Windows\System32\wscript.exe
"C:\Windows\System32\wscript.exe" //B "C:\Users\Admin\AppData\Roaming\kJqQkRKNUD.js"
3⤵
- Suspicious use of WriteProcessMemory
PID:1996

C:\Users\Admin\AppData\Roaming\AsyncClient.exe
"C:\Users\Admin\AppData\Roaming\AsyncClient.exe"
4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1920

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
5⤵
- Suspicious use of WriteProcessMemory
PID:1924

C:\Windows\SysWOW64\schtasks.exe
schtasks /create /f /sc onlogon /rl highest /tn "win" /tr '"C:\Users\Admin\AppData\Roaming\win.exe"'
6⤵
- Creates scheduled task(s)
PID:1740

C:\Windows\SysWOW64\cmd.exe
cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp3776.tmp.bat""
5⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1980

C:\Windows\SysWOW64\timeout.exe
timeout 3
6⤵
- Delays execution with timeout.exe
PID:1484

C:\Users\Admin\AppData\Roaming\win.exe
"C:\Users\Admin\AppData\Roaming\win.exe"
6⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1776

C:\Users\Admin\AppData\Local\Temp\bin.exe
"C:\Users\Admin\AppData\Local\Temp\bin.exe"
3⤵
- Executes dropped EXE
- Checks computer location settings
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
PID:1796

C:\Windows\SysWOW64\wlanext.exe
"C:\Windows\SysWOW64\wlanext.exe"
2⤵
- Adds policy Run key to start application
- Suspicious use of SetThreadContext
- Drops file in Program Files directory
- Modifies Internet Explorer settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2012

C:\Windows\SysWOW64\cmd.exe
/c del "C:\Users\Admin\AppData\Local\Temp\bin.exe"
3⤵
PID:1336

C:\Program Files\Mozilla Firefox\Firefox.exe
"C:\Program Files\Mozilla Firefox\Firefox.exe"
3⤵
PID:1992

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\bin.exe
Filesize
174KB

MD5
3ae87cd93196b3f86a2e1cfa3e6c9133

SHA1
64b444869181c8893d695072239bc48681ea10cd

SHA256
0a1b761095e129d76033c7bde535ca8f0517b4ddaaeda3981b5d8f998f8cf407

SHA512
1e1490502069ff5328939cc30a8e1aa74089e9cf918a27c0ce831c877035fe578811fcb970859c88437724c65383e86f055eedad4c14e3699d4270d280b865e8

Download Submit
C:\Users\Admin\AppData\Local\Temp\bin.exe
Filesize
174KB

MD5
3ae87cd93196b3f86a2e1cfa3e6c9133

SHA1
64b444869181c8893d695072239bc48681ea10cd

SHA256
0a1b761095e129d76033c7bde535ca8f0517b4ddaaeda3981b5d8f998f8cf407

SHA512
1e1490502069ff5328939cc30a8e1aa74089e9cf918a27c0ce831c877035fe578811fcb970859c88437724c65383e86f055eedad4c14e3699d4270d280b865e8

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp3776.tmp.bat
Filesize
147B

MD5
da2fdb858f38a5bc28519d9806e4a29a

SHA1
3f3c1d4744e770e6a1eb960350d215e6b45db564

SHA256
644414a5047aeb31d8c56f1fa45fa961ade81d9cac26b5dd86479b59d8229251

SHA512
8d1c382fef9548cf8a1da4de6490d7428df036d1afe6f0708775c888e78e74767e93c06915b14d00a9c4b9edb1283e3c96450ee40c17ec36d167024f4996377d

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\kJqQkRKNUD.js
Filesize
89KB

MD5
18c5dc6efa5c37cd44be8ab340065ab1

SHA1
8c596b75785db3ef8a1461a34504fd3f1f20c818

SHA256
5e8f0df883987badd7bbe96ec98718cf7149a07c52fbe9b083fb8fbe84c82273

SHA512
694b272e1fe75973581ce1df598b92639f3e501c89299cf14fada96d81eb10215041de4f3b9ad1e76584619fc7286dcec8bff16681c2ac60a983667dc68a7290

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/936-54-0x000007FEFBD21000-0x000007FEFBD23000-memory.dmp

Filesize
8KB

Download
memory/1268-77-0x00000000066A0000-0x00000000067DF000-memory.dmp

Filesize
1.2MB

Download
memory/1268-65-0x0000000004F30000-0x000000000500B000-memory.dmp

Filesize
876KB

Download
memory/1268-74-0x00000000066A0000-0x00000000067DF000-memory.dmp

Filesize
1.2MB

Download
memory/1268-75-0x0000000004F30000-0x000000000500B000-memory.dmp

Filesize
876KB

Download
memory/1336-69-0x0000000000000000-mapping.dmp

Download
memory/1484-83-0x0000000000000000-mapping.dmp

Download
memory/1740-80-0x0000000000000000-mapping.dmp

Download
memory/1776-86-0x0000000000000000-mapping.dmp

Download
memory/1776-88-0x00000000002B0000-0x00000000002C2000-memory.dmp

Filesize
72KB

Download
memory/1796-64-0x00000000001F0000-0x0000000000201000-memory.dmp

Filesize
68KB

Download
memory/1796-63-0x0000000000790000-0x0000000000A93000-memory.dmp

Filesize
3.0MB

Download
memory/1796-58-0x0000000000000000-mapping.dmp

Download
memory/1920-67-0x0000000000F30000-0x0000000000F42000-memory.dmp

Filesize
72KB

Download
memory/1920-60-0x0000000000000000-mapping.dmp

Download
memory/1920-78-0x00000000750C1000-0x00000000750C3000-memory.dmp

Filesize
8KB

Download
memory/1924-79-0x0000000000000000-mapping.dmp

Download
memory/1980-81-0x0000000000000000-mapping.dmp

Download
memory/1996-55-0x0000000000000000-mapping.dmp

Download
memory/2012-76-0x0000000000080000-0x00000000000AC000-memory.dmp

Filesize
176KB

Download
memory/2012-73-0x0000000001D90000-0x0000000001E20000-memory.dmp

Filesize
576KB

Download
memory/2012-72-0x0000000002060000-0x0000000002363000-memory.dmp

Filesize
3.0MB

Download
memory/2012-71-0x0000000000080000-0x00000000000AC000-memory.dmp

Filesize
176KB

Download
memory/2012-70-0x00000000007E0000-0x00000000007F6000-memory.dmp

Filesize
88KB

Download
memory/2012-66-0x0000000000000000-mapping.dmp

Download