asyncrat | 43d23d2daf0c714f7c45a0b51af8504b8c4c76c63425f0697c33f86794c6d3bc

General

Target

43d23d2daf0c714f7c45a0b51af8504b8c4c76c63425f0697c33f86794c6d3bc.exe
Size

764KB
MD5

0b17e7163977ae54e5a77b139e9430df
SHA1

7513c996cdb9e33c3e1d284a9647c62cfed21aa4
SHA256

43d23d2daf0c714f7c45a0b51af8504b8c4c76c63425f0697c33f86794c6d3bc
SHA512

4929cdae865ee5b0276856594384f497a75385beeef6a45bac3d0fa3357184c30aecfc3210fff8bfbd54a0dff320416aca1cb59636947b5320c9f1aad9ec4183
SSDEEP

12288:uztzaOCxk8Z73coqVY9y9rMuuctPygqMQBqlAyk7ymQVuGiIA1WXZL0CeEEjQp8u:uztWOCa8Zy4WAu1ZqZklAn0xi1WpL07W

Score

10^/10

asyncrat guloader default discovery downloader persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

Default

C2

109.248.151.187:49181

Mutex

AsyncMutex_6SI8OkPnk

Attributes

delay
3
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
Guloader family
guloader
Guloader,Cloudeye
A shellcode based downloader first seen in 2020.
downloader guloader

Loads dropped DLL 1 IoCs

pid	Process
2908	43d23d2daf0c714f7c45a0b51af8504b8c4c76c63425f0697c33f86794c6d3bc.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-1-5-21-3625106387-4207083342-115176794-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\Rontgen = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Bicapsular\\Substitutionally.exe"	43d23d2daf0c714f7c45a0b51af8504b8c4c76c63425f0697c33f86794c6d3bc.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
4228	43d23d2daf0c714f7c45a0b51af8504b8c4c76c63425f0697c33f86794c6d3bc.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
2908	43d23d2daf0c714f7c45a0b51af8504b8c4c76c63425f0697c33f86794c6d3bc.exe
4228	43d23d2daf0c714f7c45a0b51af8504b8c4c76c63425f0697c33f86794c6d3bc.exe

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\resources\0409\popover.ini	43d23d2daf0c714f7c45a0b51af8504b8c4c76c63425f0697c33f86794c6d3bc.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 2 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	43d23d2daf0c714f7c45a0b51af8504b8c4c76c63425f0697c33f86794c6d3bc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	43d23d2daf0c714f7c45a0b51af8504b8c4c76c63425f0697c33f86794c6d3bc.exe

NSIS installer 2 IoCs

installer

resource	yara_rule
behavioral2/files/0x000c000000023b74-26.dat	nsis_installer_1
behavioral2/files/0x000c000000023b74-26.dat	nsis_installer_2

Modifies system certificate store 2 TTPs 2 IoCs

defense_evasion spyware trojan

Install Root Certificate

T1553.004

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\AD7E1C28B064EF8F6003402014C3D0E3370EB58A	43d23d2daf0c714f7c45a0b51af8504b8c4c76c63425f0697c33f86794c6d3bc.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\AD7E1C28B064EF8F6003402014C3D0E3370EB58A\Blob = 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	43d23d2daf0c714f7c45a0b51af8504b8c4c76c63425f0697c33f86794c6d3bc.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
2908	43d23d2daf0c714f7c45a0b51af8504b8c4c76c63425f0697c33f86794c6d3bc.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4228	43d23d2daf0c714f7c45a0b51af8504b8c4c76c63425f0697c33f86794c6d3bc.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2908 wrote to memory of 4228	2908	43d23d2daf0c714f7c45a0b51af8504b8c4c76c63425f0697c33f86794c6d3bc.exe	94
PID 2908 wrote to memory of 4228	2908	43d23d2daf0c714f7c45a0b51af8504b8c4c76c63425f0697c33f86794c6d3bc.exe	94
PID 2908 wrote to memory of 4228	2908	43d23d2daf0c714f7c45a0b51af8504b8c4c76c63425f0697c33f86794c6d3bc.exe	94
PID 2908 wrote to memory of 4228	2908	43d23d2daf0c714f7c45a0b51af8504b8c4c76c63425f0697c33f86794c6d3bc.exe	94

C:\Users\Admin\AppData\Local\Temp\43d23d2daf0c714f7c45a0b51af8504b8c4c76c63425f0697c33f86794c6d3bc.exe
"C:\Users\Admin\AppData\Local\Temp\43d23d2daf0c714f7c45a0b51af8504b8c4c76c63425f0697c33f86794c6d3bc.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:2908
- C:\Users\Admin\AppData\Local\Temp\43d23d2daf0c714f7c45a0b51af8504b8c4c76c63425f0697c33f86794c6d3bc.exe
  "C:\Users\Admin\AppData\Local\Temp\43d23d2daf0c714f7c45a0b51af8504b8c4c76c63425f0697c33f86794c6d3bc.exe"
  2⤵
  - Adds Run key to start application
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Modifies system certificate store
  - Suspicious use of AdjustPrivilegeToken
  PID:4228

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

2

T1112

Subvert Trust Controls

1

T1553

Install Root Certificate

1

T1553.004

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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Downloads

C:\Users\Admin\AppData\Local\Temp\Bicapsular\Substitutionally.exe

Filesize
764KB

MD5
0b17e7163977ae54e5a77b139e9430df

SHA1
7513c996cdb9e33c3e1d284a9647c62cfed21aa4

SHA256
43d23d2daf0c714f7c45a0b51af8504b8c4c76c63425f0697c33f86794c6d3bc

SHA512
4929cdae865ee5b0276856594384f497a75385beeef6a45bac3d0fa3357184c30aecfc3210fff8bfbd54a0dff320416aca1cb59636947b5320c9f1aad9ec4183

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsg9608.tmp\System.dll

Filesize
11KB

MD5
e23600029d1b09bdb1d422fb4e46f5a6

SHA1
5d64a2f6a257a98a689a3db9a087a0fd5f180096

SHA256
7342b73593b3aa1b15e3731bfb1afd1961802a5c66343bac9a2c737ee94f4e38

SHA512
c971f513142633ce0e6ec6a04c754a286da8016563dab368c3fac83aef81fa3e9df1003c4b63d00a46351a9d18eaa7ae7645caef172e5e1d6e29123ab864e7ac

Download Submit
memory/2908-21-0x0000000077C01000-0x0000000077D21000-memory.dmp

Filesize
1.1MB

Download
memory/2908-18-0x0000000004AA0000-0x0000000007BE4000-memory.dmp

Filesize
49.3MB

Download
memory/2908-19-0x0000000004AA0000-0x0000000007BE4000-memory.dmp

Filesize
49.3MB

Download
memory/2908-22-0x0000000074A65000-0x0000000074A66000-memory.dmp

Filesize
4KB

Download
memory/2908-24-0x0000000004AA0000-0x0000000007BE4000-memory.dmp

Filesize
49.3MB

Download
memory/2908-20-0x0000000077C01000-0x0000000077D21000-memory.dmp

Filesize
1.1MB

Download
memory/4228-28-0x0000000000510000-0x0000000001764000-memory.dmp

Filesize
18.3MB

Download
memory/4228-25-0x0000000001770000-0x00000000048B4000-memory.dmp

Filesize
49.3MB

Download
memory/4228-29-0x0000000001770000-0x00000000048B4000-memory.dmp

Filesize
49.3MB

Download
memory/4228-48-0x0000000000510000-0x0000000001764000-memory.dmp

Filesize
18.3MB

Download
memory/4228-50-0x0000000000510000-0x0000000000522000-memory.dmp

Filesize
72KB

Download
memory/4228-49-0x0000000001770000-0x00000000048B4000-memory.dmp

Filesize
49.3MB

Download
memory/4228-52-0x0000000035540000-0x00000000355DC000-memory.dmp

Filesize
624KB

Download
memory/4228-53-0x0000000037990000-0x0000000037F34000-memory.dmp

Filesize
5.6MB

Download
memory/4228-54-0x0000000037F80000-0x0000000037FE6000-memory.dmp

Filesize
408KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads