asyncrat | 79ee90a6b0a3989cabbb65016b75f0186e776fecf9a34f5717968b85f8631f74

General

Target
regsvr32235.exe
Size 45KB
Sample260418-glp87shv3s
SHA256 79ee90a6b0a3989cabbb65016b75f0186e776fecf9a34f5717968b85f8631f74
MD5 439b4c70846b4f3e92ccbab9de9489ae
SHA1 378200577c9c3a3704482263566c2efa24283b2a
SHA512 9b881a2684e646ec9ccd95ba6855e0d9dc5e3ca0139f33cb9a210efe782189953711528b76e302bcab4659fd762f5d18003d5a9f543f3bb3be11b20e271bd63a
SSDEEP 768:SaEpYLvKH2IxvswUTkKGGx8cS0r2kVk1ParlIjbOg47F4+nX6EmM5bJf+:SaEpYGHYTktNQuarObx4h6JM5bJf+
TLSH
T123233C007BA9C227F2BE5F7459F222454679F2633207DA5D1CC812DA5613FC29B42AFE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

default defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

naked18.net:6606
naked18.net:7707
naked18.net:8808
www.naked18.net:6606
www.naked18.net:7707
www.naked18.net:8808
malware.naked18.net:6606
malware.naked18.net:7707
malware.naked18.net:8808

Mutex

gykO2njSjbjR

Attributes

delay
3
install
true
install_file
MalwareRAT.exe
install_folder
%AppData%

aes.plain

Signatures

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

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral2/files/0x001c00000002b412-9.dat	family_asyncrat

Executes dropped EXE 2 IoCs

pid	Process
4964	MalwareRAT.exe
4784	MalwareRAT.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 7 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	MalwareRAT.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	regsvr32235.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	MalwareRAT.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
5544	timeout.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
5440	schtasks.exe

Suspicious behavior: EnumeratesProcesses 19 IoCs

pid	Process
2720	regsvr32235.exe
2720	regsvr32235.exe
2720	regsvr32235.exe
2720	regsvr32235.exe
2720	regsvr32235.exe
2720	regsvr32235.exe
2720	regsvr32235.exe
2720	regsvr32235.exe
2720	regsvr32235.exe
2720	regsvr32235.exe
2720	regsvr32235.exe
2720	regsvr32235.exe
2720	regsvr32235.exe
2720	regsvr32235.exe
2720	regsvr32235.exe
2720	regsvr32235.exe
2720	regsvr32235.exe
2720	regsvr32235.exe
2720	regsvr32235.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2720	regsvr32235.exe
Token: SeDebugPrivilege	4964	MalwareRAT.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 2720 wrote to memory of 5380	2720	regsvr32235.exe	80
PID 2720 wrote to memory of 5396	2720	regsvr32235.exe	82
PID 5380 wrote to memory of 5440	5380	cmd.exe	84
PID 5396 wrote to memory of 5544	5396	cmd.exe	85
PID 5396 wrote to memory of 4784	5396	cmd.exe	88

C:\Users\Admin\AppData\Local\Temp\regsvr32235.exe
"C:\Users\Admin\AppData\Local\Temp\regsvr32235.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2720
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "MalwareRAT" /tr '"C:\Users\Admin\AppData\Roaming\MalwareRAT.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5380
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "MalwareRAT" /tr '"C:\Users\Admin\AppData\Roaming\MalwareRAT.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:5440
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp6A1F.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5396
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:5544
- - C:\Users\Admin\AppData\Roaming\MalwareRAT.exe
    "C:\Users\Admin\AppData\Roaming\MalwareRAT.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:4784

C:\Users\Admin\AppData\Roaming\MalwareRAT.exe
"C:\Users\Admin\AppData\Roaming\MalwareRAT.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:4964

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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tmp6A1F.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp6A1F.tmp.bat
Size 154B
SHA256 a6a2008c3e3c2cb58d699f7ee1c459f455b5bc1c0e6ab9bc91cd3fc116f83c21
MD5 442cbea5b9c8128f5a46cd710bd28fcb
SHA1 f6d286ce4669486682be8101a271b90559d01093
SHA512 194b77dc7748323a4e42f287bb95f05e7ca17d87cc19abde94c8772a77698cea6c17457cf5dc4b77b22320fa4629a8a3e93748a1b502308899af7e221c5a7e94
TLSH
T13BC08C42B6C5EB5E2D0AA41B06BA95AC916268993E84AB00870540492280449E199342
MD5 SHA1 SHA512 TLSH

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MalwareRAT.exe

Path C:\Users\Admin\AppData\Roaming\MalwareRAT.exe
Size 45KB
SHA256 79ee90a6b0a3989cabbb65016b75f0186e776fecf9a34f5717968b85f8631f74
MD5 439b4c70846b4f3e92ccbab9de9489ae
SHA1 378200577c9c3a3704482263566c2efa24283b2a
SHA512 9b881a2684e646ec9ccd95ba6855e0d9dc5e3ca0139f33cb9a210efe782189953711528b76e302bcab4659fd762f5d18003d5a9f543f3bb3be11b20e271bd63a
SSDEEP 768:SaEpYLvKH2IxvswUTkKGGx8cS0r2kVk1ParlIjbOg47F4+nX6EmM5bJf+:SaEpYGHYTktNQuarObx4h6JM5bJf+
TLSH
T123233C007BA9C227F2BE5F7459F222454679F2633207DA5D1CC812DA5613FC29B42AFE
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/2720-0-0x0000000000E60000-0x0000000000E72000-memory.dmp

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memory/2720-1-0x00000000059A0000-0x00000000059B0000-memory.dmp

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memory/2720-2-0x00000000059B0000-0x0000000005A4C000-memory.dmp

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memory/2720-7-0x0000000005CE0000-0x0000000005D62000-memory.dmp

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memory/4784-13-0x0000000000D70000-0x0000000000D7B000-memory.dmp

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memory/4964-14-0x0000000002760000-0x000000000276B000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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