asyncrat | f8d44d7880640da690ec310d1d562a37f0f63e45503d8eb8710f40dd062cf401

General

Target

SARS Documents.doc
Size

36KB
MD5

ea2c22c96421b40396d9d9a5ef2e4dc4
SHA1

77a04b21f8e8c57b7f24c6681fcac30ca09fd42b
SHA256

f8d44d7880640da690ec310d1d562a37f0f63e45503d8eb8710f40dd062cf401
SHA512

70068a330cbb1e368f941625649e0a5f0fc8f6da9def43a440ca9d19fece1f74a51ff03f7e430278f1cdf9c2c762f271f985b15cf96a40438d9a9bcc97b5814a

Score

10^/10

asyncrat rat spyware stealer

Malware Config

Signatures

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

Async RAT payload 1 IoCs

rat

Processes:

resource	yara_rule
behavioral2/memory/3884-185-0x000000000040D0AE-mapping.dmp	asyncrat

Executes dropped EXE 2 IoCs

Processes:

ySWLi.exeySWLi.exe

pid process

2160 ySWLi.exe
3884 ySWLi.exe
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
Suspicious use of SetThreadContext 1 IoCs

Processes:

ySWLi.exe

description pid process target process

PID 2160 set thread context of 3884 2160 ySWLi.exe ySWLi.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

pid	process
2160	ySWLi.exe
3884	ySWLi.exe

description	pid	process	target process
PID 2160 set thread context of 3884	2160	ySWLi.exe	ySWLi.exe

Checks processor information in registry 2 TTPs 3 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

Processes:

WINWORD.EXE

description	ioc	process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	WINWORD.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	WINWORD.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	WINWORD.EXE

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

768 schtasks.exe

pid	process
768	schtasks.exe

Enumerates system info in registry 2 TTPs 3 IoCs

Query Registry

T1012

System Information Discovery

T1082

Processes:

WINWORD.EXE

description	ioc	process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	WINWORD.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemFamily	WINWORD.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	WINWORD.EXE

Suspicious behavior: AddClipboardFormatListener 2 IoCs

Processes:

WINWORD.EXE

pid process

640 WINWORD.EXE
640 WINWORD.EXE
Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

ySWLi.exe

pid process

2160 ySWLi.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

ySWLi.exeySWLi.exe

description pid process

Token: SeDebugPrivilege 2160 ySWLi.exe
Token: SeDebugPrivilege 3884 ySWLi.exe
Suspicious use of SetWindowsHookEx 7 IoCs

Processes:

WINWORD.EXE

pid process

640 WINWORD.EXE
640 WINWORD.EXE
640 WINWORD.EXE
640 WINWORD.EXE
640 WINWORD.EXE
640 WINWORD.EXE
640 WINWORD.EXE

pid	process
640	WINWORD.EXE
640	WINWORD.EXE

pid	process
2160	ySWLi.exe

description	pid	process
Token: SeDebugPrivilege	2160	ySWLi.exe
Token: SeDebugPrivilege	3884	ySWLi.exe

pid	process
640	WINWORD.EXE
640	WINWORD.EXE
640	WINWORD.EXE
640	WINWORD.EXE
640	WINWORD.EXE
640	WINWORD.EXE
640	WINWORD.EXE

Suspicious use of WriteProcessMemory 14 IoCs

Processes:

WINWORD.EXEySWLi.exe

description	pid	process	target process
PID 640 wrote to memory of 2160	640	WINWORD.EXE	ySWLi.exe
PID 640 wrote to memory of 2160	640	WINWORD.EXE	ySWLi.exe
PID 640 wrote to memory of 2160	640	WINWORD.EXE	ySWLi.exe
PID 2160 wrote to memory of 768	2160	ySWLi.exe	schtasks.exe
PID 2160 wrote to memory of 768	2160	ySWLi.exe	schtasks.exe
PID 2160 wrote to memory of 768	2160	ySWLi.exe	schtasks.exe
PID 2160 wrote to memory of 3884	2160	ySWLi.exe	ySWLi.exe
PID 2160 wrote to memory of 3884	2160	ySWLi.exe	ySWLi.exe
PID 2160 wrote to memory of 3884	2160	ySWLi.exe	ySWLi.exe
PID 2160 wrote to memory of 3884	2160	ySWLi.exe	ySWLi.exe
PID 2160 wrote to memory of 3884	2160	ySWLi.exe	ySWLi.exe
PID 2160 wrote to memory of 3884	2160	ySWLi.exe	ySWLi.exe
PID 2160 wrote to memory of 3884	2160	ySWLi.exe	ySWLi.exe
PID 2160 wrote to memory of 3884	2160	ySWLi.exe	ySWLi.exe

C:\Program Files\Microsoft Office\Root\Office16\WINWORD.EXE
"C:\Program Files\Microsoft Office\Root\Office16\WINWORD.EXE" /n "C:\Users\Admin\AppData\Local\Temp\SARS Documents.doc" /o ""
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:640

C:\Users\Admin\AppData\Local\Temp\ySWLi.exe
C:\Users\Admin\AppData\Local\Temp\ySWLi.exe
2⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2160

C:\Windows\SysWOW64\schtasks.exe
"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\JrBmDGuxgYcA" /XML "C:\Users\Admin\AppData\Local\Temp\tmp7C93.tmp"
3⤵
- Creates scheduled task(s)
PID:768

C:\Users\Admin\AppData\Local\Temp\ySWLi.exe
"{path}"
3⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3884

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Credential Access

Credentials in Files

1

T1081

Discovery

System Information Discovery

3

T1082

Query Registry

2

T1012

Lateral Movement

Collection

Data from Local System

1

T1005

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp7C93.tmp
MD5
21c5a9f46b2860a6bc25e49041973b29

SHA1
af0ae0feecddda6d66c97d325451a377f2096dd4

SHA256
22ab64792829bfe9e8ca250272bf032dbf10a2ea90f24915d5f65307d21c27b0

SHA512
762e2cdf1898010e52b831268121b66b7b3ffb243d69efa225f0475dd6f096fb1c99f8417521a708722812101973fbe454265427528a85963fdfdb04b7bbca46

Download Submit
C:\Users\Admin\AppData\Local\Temp\ySWLi.exe
MD5
5794b56493325993815144d377d06a2a

SHA1
eebd6c8fab55d73b29e2093832eb6a9e2c71653e

SHA256
8e7f1812d857f3cae2aa6a79c2d87f0e7987a786b1f15df31ee75513cb1156bf

SHA512
1537d5c7e7a70130ee1af56a90c504ce4130d051906ad41d70e793bcced3893ee336e2cd6cb8165e997fa6e9b3c266f59eccd9b97aa15e2d19ea2c9385e3a324

Download Submit
C:\Users\Admin\AppData\Local\Temp\ySWLi.exe
MD5
5794b56493325993815144d377d06a2a

SHA1
eebd6c8fab55d73b29e2093832eb6a9e2c71653e

SHA256
8e7f1812d857f3cae2aa6a79c2d87f0e7987a786b1f15df31ee75513cb1156bf

SHA512
1537d5c7e7a70130ee1af56a90c504ce4130d051906ad41d70e793bcced3893ee336e2cd6cb8165e997fa6e9b3c266f59eccd9b97aa15e2d19ea2c9385e3a324

Download Submit
C:\Users\Admin\AppData\Local\Temp\ySWLi.exe
MD5
5794b56493325993815144d377d06a2a

SHA1
eebd6c8fab55d73b29e2093832eb6a9e2c71653e

SHA256
8e7f1812d857f3cae2aa6a79c2d87f0e7987a786b1f15df31ee75513cb1156bf

SHA512
1537d5c7e7a70130ee1af56a90c504ce4130d051906ad41d70e793bcced3893ee336e2cd6cb8165e997fa6e9b3c266f59eccd9b97aa15e2d19ea2c9385e3a324

Download Submit
memory/640-114-0x00007FFAC4B10000-0x00007FFAC4B20000-memory.dmp

Filesize
64KB

Download
memory/640-115-0x00007FFAC4B10000-0x00007FFAC4B20000-memory.dmp

Filesize
64KB

Download
memory/640-116-0x00007FFAC4B10000-0x00007FFAC4B20000-memory.dmp

Filesize
64KB

Download
memory/640-117-0x00007FFAC4B10000-0x00007FFAC4B20000-memory.dmp

Filesize
64KB

Download
memory/640-119-0x00007FFAC4B10000-0x00007FFAC4B20000-memory.dmp

Filesize
64KB

Download
memory/640-118-0x00007FFAE58D0000-0x00007FFAE83F3000-memory.dmp

Filesize
43.1MB

Download
memory/640-122-0x00007FFAE04D0000-0x00007FFAE15BE000-memory.dmp

Filesize
16.9MB

Download
memory/640-123-0x00007FFADE5D0000-0x00007FFAE04C5000-memory.dmp

Filesize
31.0MB

Download
memory/768-183-0x0000000000000000-mapping.dmp

Download
memory/2160-182-0x0000000007A80000-0x0000000007F7E000-memory.dmp

Filesize
5.0MB

Download
memory/2160-179-0x0000000000000000-mapping.dmp

Download
memory/3884-185-0x000000000040D0AE-mapping.dmp

Download
memory/3884-187-0x0000000004DE0000-0x0000000004DE1000-memory.dmp

Filesize
4KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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