asyncrat | cb24b1e0dddf2c96e3d11b056356344350bee2e73717a03aa64ff603c1b96806

General

Target

cb24b1e0dddf2c96e3d11b056356344350bee2e73717a03aa64ff603c1b96806.exe
Size

2.1MB
MD5

164e4c5b332cc56cfa830ceb3bb0cc69
SHA1

627ca05636c752d15986a0eeb19b1f12eff4ead8
SHA256

cb24b1e0dddf2c96e3d11b056356344350bee2e73717a03aa64ff603c1b96806
SHA512

df9a8d559f4f3c63f05a0f1b71079f32035edda1add1374bfd9a4a89da4595e9924c320a1024caf92c71e36916ced33d386dc6a2d35482aef2bef358f5c4d828
SSDEEP

24576:zywAui1af0bYBuu82xlkaNx933hRxYjzI8TZj7AoUs9/ZrUGyKT6rDrv3gQKsIs0:tHn0xaNxV3hnkI4Rj4g6cLsyOcsQg/P+

Score

10^/10

asyncrat default discovery rat upx

Malware Config

Extracted

Family

asyncrat

Botnet

Default

C2

allay.x3322.net:5050

Mutex

gnrfjlujxmukjuvrs

Attributes

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

aes.plain

Signatures

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

VenomRAT 5 IoCs

Detects VenomRAT.

rat

resource	yara_rule
behavioral2/memory/3248-0-0x0000000000400000-0x0000000000683000-memory.dmp	VenomRAT
behavioral2/memory/3248-3-0x0000000000400000-0x0000000000683000-memory.dmp	VenomRAT
behavioral2/files/0x000f000000023406-8.dat	VenomRAT
behavioral2/memory/4896-16-0x0000000000C00000-0x0000000000C18000-memory.dmp	VenomRAT
behavioral2/memory/3248-19-0x0000000000400000-0x0000000000683000-memory.dmp	VenomRAT

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral2/files/0x000f000000023406-8.dat	family_asyncrat

Checks computer location settings 2 TTPs 2 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-1-5-21-656926755-4116854191-210765258-1000\Control Panel\International\Geo\Nation	cb24b1e0dddf2c96e3d11b056356344350bee2e73717a03aa64ff603c1b96806.exe
Key value queried	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000\Control Panel\International\Geo\Nation	Client.exe

Executes dropped EXE 2 IoCs

pid	Process
4896	Client.exe
2080	WriteFile.exe

UPX packed file 1 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/3248-2-0x0000000068CD0000-0x0000000068CDF000-memory.dmp	upx

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 1 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	cb24b1e0dddf2c96e3d11b056356344350bee2e73717a03aa64ff603c1b96806.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
548	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
3984	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
3248	cb24b1e0dddf2c96e3d11b056356344350bee2e73717a03aa64ff603c1b96806.exe
3248	cb24b1e0dddf2c96e3d11b056356344350bee2e73717a03aa64ff603c1b96806.exe
4896	Client.exe
4896	Client.exe
4896	Client.exe
4896	Client.exe
4896	Client.exe
4896	Client.exe
4896	Client.exe
4896	Client.exe
4896	Client.exe
4896	Client.exe
4896	Client.exe
4896	Client.exe
4896	Client.exe
4896	Client.exe
4896	Client.exe
4896	Client.exe
4896	Client.exe
4896	Client.exe
4896	Client.exe
2080	WriteFile.exe
2080	WriteFile.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4896	Client.exe
Token: SeDebugPrivilege	2080	WriteFile.exe

Suspicious use of SetWindowsHookEx 4 IoCs

pid	Process
3248	cb24b1e0dddf2c96e3d11b056356344350bee2e73717a03aa64ff603c1b96806.exe
3248	cb24b1e0dddf2c96e3d11b056356344350bee2e73717a03aa64ff603c1b96806.exe
3248	cb24b1e0dddf2c96e3d11b056356344350bee2e73717a03aa64ff603c1b96806.exe
2080	WriteFile.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 3248 wrote to memory of 4896	3248	cb24b1e0dddf2c96e3d11b056356344350bee2e73717a03aa64ff603c1b96806.exe	106
PID 3248 wrote to memory of 4896	3248	cb24b1e0dddf2c96e3d11b056356344350bee2e73717a03aa64ff603c1b96806.exe	106
PID 4896 wrote to memory of 4992	4896	Client.exe	107
PID 4896 wrote to memory of 4992	4896	Client.exe	107
PID 4896 wrote to memory of 2788	4896	Client.exe	109
PID 4896 wrote to memory of 2788	4896	Client.exe	109
PID 2788 wrote to memory of 548	2788	cmd.exe	111
PID 2788 wrote to memory of 548	2788	cmd.exe	111
PID 4992 wrote to memory of 3984	4992	cmd.exe	112
PID 4992 wrote to memory of 3984	4992	cmd.exe	112
PID 2788 wrote to memory of 2080	2788	cmd.exe	113
PID 2788 wrote to memory of 2080	2788	cmd.exe	113

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\cb24b1e0dddf2c96e3d11b056356344350bee2e73717a03aa64ff603c1b96806.exe
"C:\Users\Admin\AppData\Local\Temp\cb24b1e0dddf2c96e3d11b056356344350bee2e73717a03aa64ff603c1b96806.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3248
- C:\Client.exe
  "C:\Client.exe"
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4896
- - C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "WriteFile" /tr '"C:\Users\Admin\AppData\Roaming\WriteFile.exe"' & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4992
  - - C:\Windows\system32\schtasks.exe
      schtasks /create /f /sc onlogon /rl highest /tn "WriteFile" /tr '"C:\Users\Admin\AppData\Roaming\WriteFile.exe"'
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:3984
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp9224.tmp.bat""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2788
  - - C:\Windows\system32\timeout.exe
      timeout 3
      4⤵
      Delays execution with timeout.exe
      PID:548
  - - C:\Users\Admin\AppData\Roaming\WriteFile.exe
      "C:\Users\Admin\AppData\Roaming\WriteFile.exe"
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of SetWindowsHookEx
      PID:2080

Network

MITRE ATT&CK Enterprise v15

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

Query Registry

2

T1012

System Information Discovery

2

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:\Client.exe

Filesize
74KB

MD5
b7d579e26b673c6866c448e6af708515

SHA1
ef19b6d6fcd369c8636dc0539dd32589a89f2c09

SHA256
6035245b15f24292d031bb460c6b9a4301ced628f93d37b58771aca3b49aa07a

SHA512
df0ad0004e9e40274bdd4ac586400b096679d456e35b0ac2a2d25c15cff17557428bb38023c8ed38c52e3d7eef962cfd1c3092f82fe5ea2ef1cf0ea442c8741c

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp9224.tmp.bat

Filesize
153B

MD5
948a519d0c8a5d9ade6ac3c45eab06c5

SHA1
7ede94b745935a459c37f46414f024bb57f6bef1

SHA256
d569f7be4b4c18f7c4bff9b6a6682f0ec9bf850c3b408c994be4ed70f1dda157

SHA512
17ee9a0d11295cc4d9826c97ac10132312d3451d4e6f37155ed9ed288ee07d703ede5572eed25fdcb7a849172b9ab808872936ceacb8c2050f248bb19b3e32b8

Download Submit
C:\Users\Admin\AppData\Roaming\MyData\DataLogs.conf

Filesize
8B

MD5
cf759e4c5f14fe3eec41b87ed756cea8

SHA1
c27c796bb3c2fac929359563676f4ba1ffada1f5

SHA256
c9f9f193409217f73cc976ad078c6f8bf65d3aabcf5fad3e5a47536d47aa6761

SHA512
c7f832aee13a5eb36d145f35d4464374a9e12fa2017f3c2257442d67483b35a55eccae7f7729243350125b37033e075efbc2303839fd86b81b9b4dca3626953b

Download Submit
memory/3248-0-0x0000000000400000-0x0000000000683000-memory.dmp

Filesize
2.5MB

Download
memory/3248-2-0x0000000068CD0000-0x0000000068CDF000-memory.dmp

Filesize
60KB

Download
memory/3248-3-0x0000000000400000-0x0000000000683000-memory.dmp

Filesize
2.5MB

Download
memory/3248-19-0x0000000000400000-0x0000000000683000-memory.dmp

Filesize
2.5MB

Download
memory/4896-15-0x00007FFFE65A3000-0x00007FFFE65A5000-memory.dmp

Filesize
8KB

Download
memory/4896-16-0x0000000000C00000-0x0000000000C18000-memory.dmp

Filesize
96KB

Download
memory/4896-18-0x00007FFFE65A0000-0x00007FFFE7061000-memory.dmp

Filesize
10.8MB

Download
memory/4896-24-0x00007FFFE65A0000-0x00007FFFE7061000-memory.dmp

Filesize
10.8MB

Download
memory/4896-25-0x00007FFFE65A0000-0x00007FFFE7061000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads