asyncrat | 01035e3da31903105da034556332fdb5e12b1b73d3bdd743c53dda86b1a02f2f

Resubmissions

11/03/2023, 19:58

230311-ypv3asch8w10

11/03/2023, 19:54

230311-yml2lsbb2710

Analysis

max time kernel
26s
max time network
24s
platform
windows7_x64
resource
win7-20230220-en
resource tags

arch:x64arch:x86image:win7-20230220-enlocale:en-usos:windows7-x64system
submitted
11/03/2023, 19:54

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General

Target
test.exe
Size 2.9MB
Sample230311-yml2lsbb27
SHA256 01035e3da31903105da034556332fdb5e12b1b73d3bdd743c53dda86b1a02f2f
MD5 500151e7dc0acc7fda0cd4d3870ecacd
SHA1 4a634975feb1c3adf814cfb0ff5dfcf75ad5dfdf
SHA512 6b082b7111bef5fec0193da473ff766b6ecc1b71fe985d2728354bb11ef948f4a6200849b1d9f98746c30783fe58e1d4f68c57f496d391ee43a963e926b42da5
SSDEEP 49152:RDwZ5Z54M/4rYHU50V5tT3Eo2dhlYbAoxrYYHX7iWd7r9adMu:iZB4i4rF2Yo2dhExrhHLBd7rqMu
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

asyncrat default evasion rat themida trojan

Malware Config

Extracted

Family

asyncrat

Version

1.0.7

Botnet

Default

coolmaneurokoolcom-26401.portmap.host:26401

Mutex

DcRatMutex_qwqdanchun

Attributes

delay
1
install
true
install_file
ABDJCM.exe
install_folder
%AppData%

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat

Async RAT payload 2 IoCs

rat

resource	yara_rule
behavioral1/memory/1552-56-0x0000000000870000-0x0000000001086000-memory.dmp	asyncrat
behavioral1/memory/1552-57-0x0000000000870000-0x0000000001086000-memory.dmp	asyncrat

Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 1 IoCs

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	test.exe

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

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	test.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	test.exe

Themida packer 2 IoCs

Detects Themida, an advanced Windows software protection system.

themida

resource	yara_rule
behavioral1/memory/1552-56-0x0000000000870000-0x0000000001086000-memory.dmp	themida
behavioral1/memory/1552-57-0x0000000000870000-0x0000000001086000-memory.dmp	themida

Checks whether UAC is enabled 1 TTPs 1 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	test.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
1552	test.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

pid	Process
560	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1552	test.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1552	test.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1552 wrote to memory of 1688	1552	test.exe	27
PID 1552 wrote to memory of 1688	1552	test.exe	27
PID 1552 wrote to memory of 1688	1552	test.exe	27
PID 1552 wrote to memory of 1688	1552	test.exe	27
PID 1688 wrote to memory of 560	1688	cmd.exe	29
PID 1688 wrote to memory of 560	1688	cmd.exe	29
PID 1688 wrote to memory of 560	1688	cmd.exe	29
PID 1688 wrote to memory of 560	1688	cmd.exe	29

C:\Users\Admin\AppData\Local\Temp\test.exe
"C:\Users\Admin\AppData\Local\Temp\test.exe"
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1552
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "ABDJCM" /tr '"C:\Users\Admin\AppData\Roaming\ABDJCM.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1688
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "ABDJCM" /tr '"C:\Users\Admin\AppData\Roaming\ABDJCM.exe"'
    3⤵
    - Creates scheduled task(s)
    PID:560

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Virtualization/Sandbox Evasion

T1497

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Virtualization/Sandbox Evasion

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/1552-56-0x0000000000870000-0x0000000001086000-memory.dmp

Download

memory/1552-57-0x0000000000870000-0x0000000001086000-memory.dmp

Download

memory/1552-58-0x0000000005180000-0x00000000051C0000-memory.dmp

Download

memory/1552-60-0x0000000000870000-0x0000000001086000-memory.dmp

Download

memory/1552-62-0x0000000005180000-0x00000000051C0000-memory.dmp

Download