asyncrat | f7e908624a90f1442950858f52b0c2fe3b1fca71c9041612693d1c91ad4c3753

General

Target

Instaladores/evasor/extras/ejecutores/inperfecto/PEInstaller.exe
Size

48KB
MD5

a96ef57452d73871dc1045b96fddcf96
SHA1

7a9b28306b0fc32d4281b756be5bc91f53234696
SHA256

2fd4684b115a4b607493596b7fba4d54ddc7d97aec1852fbd60d449f353c2902
SHA512

14db2977907baa98fe81f66fc0b44d360bee92d8b5e53527021fd9ef5f182e3aaa30e5e05ef95b0eac3d09b21074e89dee42c59d8a23b91a3dfa0c4871c3cd8e
SSDEEP

768:auklVT0kLd3WULVPdVmo2qDCXLlN7/z0hW7PIeLDB20bH35ZXmyFBL09dlhS+BDM:auklVT0M912pL/wveL/bH3/2ybLelhS3

Score

10^/10

asyncrat default 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
behavioral2/files/0x000c00000002415f-15.dat	family_asyncrat

Checks computer location settings 2 TTPs 1 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-1-5-21-308834014-1004923324-1191300197-1000\Control Panel\International\Geo\Nation	PEInstaller.exe

Executes dropped EXE 1 IoCs

pid	Process
2356	executor.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 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	PEInstaller.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.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	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	executor.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
4812	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
4788	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
2328	PEInstaller.exe
2328	PEInstaller.exe
2328	PEInstaller.exe
2328	PEInstaller.exe
2328	PEInstaller.exe
2328	PEInstaller.exe
2328	PEInstaller.exe
2328	PEInstaller.exe
2328	PEInstaller.exe
2328	PEInstaller.exe
2328	PEInstaller.exe
2328	PEInstaller.exe
2328	PEInstaller.exe
2328	PEInstaller.exe
2328	PEInstaller.exe
2328	PEInstaller.exe
2328	PEInstaller.exe
2328	PEInstaller.exe
2328	PEInstaller.exe
2328	PEInstaller.exe
2328	PEInstaller.exe
2328	PEInstaller.exe
2328	PEInstaller.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2328	PEInstaller.exe
Token: SeDebugPrivilege	2356	executor.exe
Token: SeDebugPrivilege	2356	executor.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2328 wrote to memory of 1372	2328	PEInstaller.exe	95
PID 2328 wrote to memory of 1372	2328	PEInstaller.exe	95
PID 2328 wrote to memory of 1372	2328	PEInstaller.exe	95
PID 2328 wrote to memory of 4600	2328	PEInstaller.exe	97
PID 2328 wrote to memory of 4600	2328	PEInstaller.exe	97
PID 2328 wrote to memory of 4600	2328	PEInstaller.exe	97
PID 1372 wrote to memory of 4788	1372	cmd.exe	99
PID 1372 wrote to memory of 4788	1372	cmd.exe	99
PID 1372 wrote to memory of 4788	1372	cmd.exe	99
PID 4600 wrote to memory of 4812	4600	cmd.exe	100
PID 4600 wrote to memory of 4812	4600	cmd.exe	100
PID 4600 wrote to memory of 4812	4600	cmd.exe	100
PID 4600 wrote to memory of 2356	4600	cmd.exe	101
PID 4600 wrote to memory of 2356	4600	cmd.exe	101
PID 4600 wrote to memory of 2356	4600	cmd.exe	101

C:\Users\Admin\AppData\Local\Temp\Instaladores\evasor\extras\ejecutores\inperfecto\PEInstaller.exe
"C:\Users\Admin\AppData\Local\Temp\Instaladores\evasor\extras\ejecutores\inperfecto\PEInstaller.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2328
- 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
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1372
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "executor" /tr '"C:\Users\Admin\AppData\Local\Temp\executor.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:4788
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpAA4A.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4600
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:4812
- - C:\Users\Admin\AppData\Local\Temp\executor.exe
    "C:\Users\Admin\AppData\Local\Temp\executor.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2356

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

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\Temp\executor.exe

Filesize
48KB

MD5
a96ef57452d73871dc1045b96fddcf96

SHA1
7a9b28306b0fc32d4281b756be5bc91f53234696

SHA256
2fd4684b115a4b607493596b7fba4d54ddc7d97aec1852fbd60d449f353c2902

SHA512
14db2977907baa98fe81f66fc0b44d360bee92d8b5e53527021fd9ef5f182e3aaa30e5e05ef95b0eac3d09b21074e89dee42c59d8a23b91a3dfa0c4871c3cd8e

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpAA4A.tmp.bat

Filesize
155B

MD5
4d5cbf466f741676d06fcae7b4cbd49c

SHA1
ef0ae4f5ba0eb8e7641cf60d1c4a59a0b240e97a

SHA256
f2a28cafb215e0da7d3f843033b33f20c9b7a0cc90f8188ff3782d99e42d6d24

SHA512
0cf49dc6cca9ebc380376791b4e5edaeb46a1c129e78f63d53dbbd5d1b375899831bb6c7cdfbc70b8809db306e2f198a1a4b289ac69898f4e29c60ac690e18ed

Download Submit
memory/2328-0-0x0000000074B2E000-0x0000000074B2F000-memory.dmp

Filesize
4KB

Download
memory/2328-1-0x0000000000DC0000-0x0000000000DD2000-memory.dmp

Filesize
72KB

Download
memory/2328-2-0x0000000074B2E000-0x0000000074B2F000-memory.dmp

Filesize
4KB

Download
memory/2328-3-0x0000000074B20000-0x00000000752D0000-memory.dmp

Filesize
7.7MB

Download
memory/2328-4-0x0000000005780000-0x00000000057E6000-memory.dmp

Filesize
408KB

Download
memory/2328-5-0x0000000005C10000-0x0000000005CAC000-memory.dmp

Filesize
624KB

Download
memory/2328-6-0x0000000005BB0000-0x0000000005BF0000-memory.dmp

Filesize
256KB

Download
memory/2328-11-0x0000000074B20000-0x00000000752D0000-memory.dmp

Filesize
7.7MB

Download
memory/2356-16-0x0000000074A90000-0x0000000075240000-memory.dmp

Filesize
7.7MB

Download
memory/2356-17-0x0000000074A90000-0x0000000075240000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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