asyncrat | 8ff7fdedc9420387bcf059c5883770b0b4cb6828d1a593032fcc82cf73963d28

General

Target

KR-310820.exe
Size

896KB
MD5

685be020460aac060f121dd2d689cc2e
SHA1

eca95082e24b2d15c1cc9f18d8083b9527b23eae
SHA256

c2e6a6a4dcceeb65c2b769b92223c4b5c6de325709146391a4863dd56f4eb3d1
SHA512

c2d1330653a2a15d4a84ecaa003e4879bab4116d603a78d0e2adee92e8b0ea728ee284d7d59e73be083274637ce02df96c50ce6ee149d4b9dc4b00a43c93b055

Score

10^/10

asyncrat newjob1 evasion rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

newjob1

Mutex

AsyncMutex_6SI8OkPnk

Attributes

delay
3
install
false
install_folder
%AppData%
pastebin_config
https://pastebin.com/raw/eeJq8Ku6

aes.plain

Signatures

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

Async RAT payload 6 IoCs

rat

Processes:

resource	yara_rule
behavioral1/memory/1976-64-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral1/memory/1976-65-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral1/memory/1976-67-0x000000000040C75E-mapping.dmp	asyncrat
behavioral1/memory/1976-66-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral1/memory/1976-69-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral1/memory/1976-71-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat

Looks for VirtualBox Guest Additions in registry 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497
Looks for VMWare Tools registry key 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

Checks BIOS information in registry 2 TTPs 2 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

Processes:

KR-310820.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	KR-310820.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	KR-310820.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs

Web Service
T1102

Maps connected drives based on registry 3 TTPs 2 IoCs

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

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

Processes:

KR-310820.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	KR-310820.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\Disk\Enum\0	KR-310820.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

KR-310820.exe

description pid process target process

PID 1800 set thread context of 1976 1800 KR-310820.exe MSBuild.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

528 schtasks.exe
Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

KR-310820.exe

pid process

1800 KR-310820.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

KR-310820.exeMSBuild.exe

description pid process

Token: SeDebugPrivilege 1800 KR-310820.exe
Token: SeDebugPrivilege 1976 MSBuild.exe

description	pid	process	target process
PID 1800 set thread context of 1976	1800	KR-310820.exe	MSBuild.exe

pid	process
528	schtasks.exe

pid	process
1800	KR-310820.exe

description	pid	process
Token: SeDebugPrivilege	1800	KR-310820.exe
Token: SeDebugPrivilege	1976	MSBuild.exe

Suspicious use of WriteProcessMemory 13 IoCs

Processes:

KR-310820.exe

description	pid	process	target process
PID 1800 wrote to memory of 528	1800	KR-310820.exe	schtasks.exe
PID 1800 wrote to memory of 528	1800	KR-310820.exe	schtasks.exe
PID 1800 wrote to memory of 528	1800	KR-310820.exe	schtasks.exe
PID 1800 wrote to memory of 528	1800	KR-310820.exe	schtasks.exe
PID 1800 wrote to memory of 1976	1800	KR-310820.exe	MSBuild.exe
PID 1800 wrote to memory of 1976	1800	KR-310820.exe	MSBuild.exe
PID 1800 wrote to memory of 1976	1800	KR-310820.exe	MSBuild.exe
PID 1800 wrote to memory of 1976	1800	KR-310820.exe	MSBuild.exe
PID 1800 wrote to memory of 1976	1800	KR-310820.exe	MSBuild.exe
PID 1800 wrote to memory of 1976	1800	KR-310820.exe	MSBuild.exe
PID 1800 wrote to memory of 1976	1800	KR-310820.exe	MSBuild.exe
PID 1800 wrote to memory of 1976	1800	KR-310820.exe	MSBuild.exe
PID 1800 wrote to memory of 1976	1800	KR-310820.exe	MSBuild.exe

C:\Users\Admin\AppData\Local\Temp\KR-310820.exe
"C:\Users\Admin\AppData\Local\Temp\KR-310820.exe"
1⤵
- Checks BIOS information in registry
- Maps connected drives based on registry
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1800

C:\Windows\SysWOW64\schtasks.exe
"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\fuWPvVaSzDbeET" /XML "C:\Users\Admin\AppData\Local\Temp\tmp7D7A.tmp"
2⤵
- Creates scheduled task(s)
PID:528

C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe"
2⤵
- Suspicious use of AdjustPrivilegeToken
PID:1976

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

Virtualization/Sandbox Evasion

2

T1497

Credential Access

Discovery

Query Registry

4

T1012

Virtualization/Sandbox Evasion

2

T1497

System Information Discovery

3

T1082

Peripheral Device Discovery

1

T1120

Lateral Movement

Collection

Exfiltration

Command and Control

Web Service

1

T1102

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp7D7A.tmp
Filesize
1KB

MD5
473ef479bdccb0dd4a477ca10fd9857e

SHA1
44134a017763e8c638fcfae9dcf153f521e9e12f

SHA256
128532924f6b312b315540beeafc33031712639897853ddb7cd33d848b47628e

SHA512
e1463589d8f6e14cb2444b6ab13a17ccda1909e6fa1e9774f0f7933b7cbf99f10ec8baa01ac0a3173a954c04e4f62b1a24596bca2829c3fef8914227727e8ef3

Download Submit
memory/528-59-0x0000000000000000-mapping.dmp

Download
memory/1800-57-0x0000000004AB0000-0x0000000004AFC000-memory.dmp

Filesize
304KB

Download
memory/1800-54-0x0000000000350000-0x0000000000436000-memory.dmp

Filesize
920KB

Download
memory/1800-58-0x00000000008A0000-0x00000000008C2000-memory.dmp

Filesize
136KB

Download
memory/1800-56-0x00000000004F0000-0x0000000000500000-memory.dmp

Filesize
64KB

Download
memory/1800-55-0x0000000074E91000-0x0000000074E93000-memory.dmp

Filesize
8KB

Download
memory/1976-61-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/1976-62-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/1976-64-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/1976-65-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/1976-67-0x000000000040C75E-mapping.dmp

Download
memory/1976-66-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/1976-69-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/1976-71-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads