asyncrat | 81cc95ed86dd840e6d4f9381d54a49345d6c329992bb10f578448e68de10b108

General

Target

81cc95ed86dd840e6d4f9381d54a49345d6c329992bb10f578448e68de10b108N.exe
Size

544KB
MD5

4ab04f6128ac78658115bdf49e842030
SHA1

bc3895eb9080d2be42c6a3a46f6ac5ecd27b54fd
SHA256

81cc95ed86dd840e6d4f9381d54a49345d6c329992bb10f578448e68de10b108
SHA512

054acca118b1cdbfa081e1558008a17de9b08bbf028922b3c54bc79b79d2df826f78f23e0d242bcc3ca7e533635de5061afd42fe9254eb9b26dc9430b19ec236
SSDEEP

6144:hHL4WOLSPswA+PjIMcTCRu9DWoitq2+nVE7pSwqPNq:uWO+PtBPj/cWwpYqq

Score

10^/10

asyncrat discovery persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.4.9G

C2

corporation.warzonedns.com:9341

Mutex

65845562146GZ23

Attributes

delay
0
install
false
install_folder
%AppData%

aes.plain

Signatures

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

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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	81cc95ed86dd840e6d4f9381d54a49345d6c329992bb10f578448e68de10b108N.exe

Executes dropped EXE 1 IoCs

pid	Process
4804	PlexMedia.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\PlexService = "C:\\Users\\Admin\\AppData\\Roaming\\PlexService\\PlexMedia.exe"	81cc95ed86dd840e6d4f9381d54a49345d6c329992bb10f578448e68de10b108N.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4804 set thread context of 4516	4804	PlexMedia.exe	100

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 5 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	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	RegAsm.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	81cc95ed86dd840e6d4f9381d54a49345d6c329992bb10f578448e68de10b108N.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PlexMedia.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Checks processor information in registry 2 TTPs 2 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\Registry\Machine\HARDWARE\DESCRIPTION\System\CentralProcessor\0	RegAsm.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	RegAsm.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
916	timeout.exe

Suspicious behavior: EnumeratesProcesses 24 IoCs

pid	Process
4516	RegAsm.exe
4516	RegAsm.exe
4516	RegAsm.exe
4516	RegAsm.exe
4516	RegAsm.exe
4516	RegAsm.exe
4516	RegAsm.exe
4516	RegAsm.exe
4516	RegAsm.exe
4516	RegAsm.exe
4516	RegAsm.exe
4516	RegAsm.exe
4516	RegAsm.exe
4516	RegAsm.exe
4516	RegAsm.exe
4516	RegAsm.exe
4516	RegAsm.exe
4516	RegAsm.exe
4516	RegAsm.exe
4516	RegAsm.exe
4516	RegAsm.exe
4516	RegAsm.exe
4516	RegAsm.exe
4516	RegAsm.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 4924 wrote to memory of 4804	4924	81cc95ed86dd840e6d4f9381d54a49345d6c329992bb10f578448e68de10b108N.exe	90
PID 4924 wrote to memory of 4804	4924	81cc95ed86dd840e6d4f9381d54a49345d6c329992bb10f578448e68de10b108N.exe	90
PID 4924 wrote to memory of 4804	4924	81cc95ed86dd840e6d4f9381d54a49345d6c329992bb10f578448e68de10b108N.exe	90
PID 4924 wrote to memory of 4044	4924	81cc95ed86dd840e6d4f9381d54a49345d6c329992bb10f578448e68de10b108N.exe	91
PID 4924 wrote to memory of 4044	4924	81cc95ed86dd840e6d4f9381d54a49345d6c329992bb10f578448e68de10b108N.exe	91
PID 4924 wrote to memory of 4044	4924	81cc95ed86dd840e6d4f9381d54a49345d6c329992bb10f578448e68de10b108N.exe	91
PID 4044 wrote to memory of 916	4044	cmd.exe	94
PID 4044 wrote to memory of 916	4044	cmd.exe	94
PID 4044 wrote to memory of 916	4044	cmd.exe	94
PID 4804 wrote to memory of 4516	4804	PlexMedia.exe	100
PID 4804 wrote to memory of 4516	4804	PlexMedia.exe	100
PID 4804 wrote to memory of 4516	4804	PlexMedia.exe	100
PID 4804 wrote to memory of 4516	4804	PlexMedia.exe	100
PID 4804 wrote to memory of 4516	4804	PlexMedia.exe	100
PID 4804 wrote to memory of 4516	4804	PlexMedia.exe	100
PID 4804 wrote to memory of 4516	4804	PlexMedia.exe	100
PID 4804 wrote to memory of 4516	4804	PlexMedia.exe	100

C:\Users\Admin\AppData\Local\Temp\81cc95ed86dd840e6d4f9381d54a49345d6c329992bb10f578448e68de10b108N.exe
"C:\Users\Admin\AppData\Local\Temp\81cc95ed86dd840e6d4f9381d54a49345d6c329992bb10f578448e68de10b108N.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4924
- C:\Users\Admin\AppData\Roaming\PlexService\PlexMedia.exe
  "C:\Users\Admin\AppData\Roaming\PlexService\PlexMedia.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4804
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    - Checks processor information in registry
    - Suspicious behavior: EnumeratesProcesses
    PID:4516
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\PlexService\PlexMedia.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4044
- - C:\Windows\SysWOW64\timeout.exe
    timeout /t 180
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:916

C:\Windows\system32\wbem\WmiApSrv.exe
C:\Windows\system32\wbem\WmiApSrv.exe
1⤵
PID:632

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

3

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\PlexService\PlexMedia.bat

Filesize
212B

MD5
787142f81eb1a9ec3f978ac64e069ee9

SHA1
cb5d7aa00da5378f01bcab6ea47e2e1ec75209af

SHA256
d1092363d523d099cdbbaefef20dba86d6f8a8b7717b311a7262367f8fa9a303

SHA512
d1abd517f1a4a6702787f707efe3fe8c355cafe2664b0a4784c22c7076bc90aaa570292d5e079c12f72ef6ebebb36b0f51215412bb963854b6614332ce447a5d

Download Submit
C:\Users\Admin\AppData\Roaming\PlexService\PlexMedia.exe

Filesize
544KB

MD5
c28ff2ba960cc16a850fe449e96bb2c1

SHA1
d3843eafc393e584ddd07c472b85ee81e59a8739

SHA256
6eed0a444acbf457abaa485c232aa00f62477a11eae27c4037d600c2bbf44e97

SHA512
8025a587ae8b16b132d972f27e5435c45226a06521034cb78980721709380a02115096a45bd3a0cc84a32b067866408378afabfc11fa64e690fa289d672129dd

Download Submit
memory/4516-29-0x0000000000400000-0x0000000000436000-memory.dmp

Filesize
216KB

Download
memory/4804-31-0x0000000075090000-0x0000000075840000-memory.dmp

Filesize
7.7MB

Download
memory/4804-28-0x0000000075090000-0x0000000075840000-memory.dmp

Filesize
7.7MB

Download
memory/4804-26-0x0000000075090000-0x0000000075840000-memory.dmp

Filesize
7.7MB

Download
memory/4924-6-0x0000000004D90000-0x0000000004D9A000-memory.dmp

Filesize
40KB

Download
memory/4924-10-0x000000007509E000-0x000000007509F000-memory.dmp

Filesize
4KB

Download
memory/4924-0-0x000000007509E000-0x000000007509F000-memory.dmp

Filesize
4KB

Download
memory/4924-25-0x0000000075090000-0x0000000075840000-memory.dmp

Filesize
7.7MB

Download
memory/4924-5-0x0000000075090000-0x0000000075840000-memory.dmp

Filesize
7.7MB

Download
memory/4924-4-0x0000000004DA0000-0x0000000004DAA000-memory.dmp

Filesize
40KB

Download
memory/4924-3-0x0000000004E00000-0x0000000004E92000-memory.dmp

Filesize
584KB

Download
memory/4924-2-0x00000000053B0000-0x0000000005954000-memory.dmp

Filesize
5.6MB

Download
memory/4924-1-0x0000000000310000-0x000000000039E000-memory.dmp

Filesize
568KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads