purecrypter | 75f6fa2b6b27e284e274706113a51d756d313d7326cb515d77abf7617c4a8295

General

Target

Aaqaybpuu.exe
Size

4.9MB
MD5

a06614c188d065ad72275761891c0f00
SHA1

dfe7e3037ea5ea699c6491988b09e207818a3793
SHA256

75f6fa2b6b27e284e274706113a51d756d313d7326cb515d77abf7617c4a8295
SHA512

c79445dbf40f71673cf5950450b6001ab51a43383d5dd3319343b5e45517d6ea46c4f61f361f3c560bc5851afbf2024dab248a90b22dba9f6abe29727946df06
SSDEEP

24576:8ahlMa/PkO7hTqcaIqZUFUMIzsqZXr46240TNdv3pPZmypz:

Score

10^/10

purecrypter remcos remotehost downloader loader persistence rat

Malware Config

Extracted

Family

remcos

Version

2.7.1 Pro

Botnet

RemoteHost

C2

79.142.69.160:24103

127.0.0.1:24103

10.9.239.161:24103

Attributes

audio_folder
MicRecords
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
remcos.exe
copy_folder
Remcos
delete_file
false
hide_file
false
hide_keylog_file
false
install_flag
false
install_path
%AppData%
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
keylog_path
%AppData%
mouse_option
false
mutex
Remcos-RQ9NAF
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
Remcos
take_screenshot_option
false
take_screenshot_time
5
take_screenshot_title
wikipedia;solitaire;

Signatures

Detect PureCrypter injector 1 IoCs

loader

Processes:

resource	yara_rule
behavioral1/memory/916-55-0x00000000062D0000-0x0000000006544000-memory.dmp	family_purecrypter

PureCrypter
PureCrypter is a .NET malware loader first seen in early 2021.
loader downloader purecrypter
Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

Aaqaybpuu.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows\CurrentVersion\Run\Xrhfmjp = "\"C:\\Users\\Admin\\AppData\\Roaming\\Qjovnqqka\\Xrhfmjp.exe\""	Aaqaybpuu.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

Aaqaybpuu.exe

description pid process target process

PID 916 set thread context of 932 916 Aaqaybpuu.exe Aaqaybpuu.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

powershell.exepowershell.exe

pid process

1340 powershell.exe
592 powershell.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

Aaqaybpuu.exepowershell.exepowershell.exe

description pid process

Token: SeDebugPrivilege 916 Aaqaybpuu.exe
Token: SeDebugPrivilege 1340 powershell.exe
Token: SeDebugPrivilege 592 powershell.exe

description	pid	process	target process
PID 916 set thread context of 932	916	Aaqaybpuu.exe	Aaqaybpuu.exe

pid	process
1340	powershell.exe
592	powershell.exe

description	pid	process
Token: SeDebugPrivilege	916	Aaqaybpuu.exe
Token: SeDebugPrivilege	1340	powershell.exe
Token: SeDebugPrivilege	592	powershell.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

Aaqaybpuu.execmd.exe

description	pid	process	target process
PID 916 wrote to memory of 1340	916	Aaqaybpuu.exe	powershell.exe
PID 916 wrote to memory of 1340	916	Aaqaybpuu.exe	powershell.exe
PID 916 wrote to memory of 1340	916	Aaqaybpuu.exe	powershell.exe
PID 916 wrote to memory of 1340	916	Aaqaybpuu.exe	powershell.exe
PID 916 wrote to memory of 1976	916	Aaqaybpuu.exe	cmd.exe
PID 916 wrote to memory of 1976	916	Aaqaybpuu.exe	cmd.exe
PID 916 wrote to memory of 1976	916	Aaqaybpuu.exe	cmd.exe
PID 916 wrote to memory of 1976	916	Aaqaybpuu.exe	cmd.exe
PID 1976 wrote to memory of 592	1976	cmd.exe	powershell.exe
PID 1976 wrote to memory of 592	1976	cmd.exe	powershell.exe
PID 1976 wrote to memory of 592	1976	cmd.exe	powershell.exe
PID 1976 wrote to memory of 592	1976	cmd.exe	powershell.exe
PID 916 wrote to memory of 932	916	Aaqaybpuu.exe	Aaqaybpuu.exe
PID 916 wrote to memory of 932	916	Aaqaybpuu.exe	Aaqaybpuu.exe
PID 916 wrote to memory of 932	916	Aaqaybpuu.exe	Aaqaybpuu.exe
PID 916 wrote to memory of 932	916	Aaqaybpuu.exe	Aaqaybpuu.exe
PID 916 wrote to memory of 932	916	Aaqaybpuu.exe	Aaqaybpuu.exe
PID 916 wrote to memory of 932	916	Aaqaybpuu.exe	Aaqaybpuu.exe
PID 916 wrote to memory of 932	916	Aaqaybpuu.exe	Aaqaybpuu.exe
PID 916 wrote to memory of 932	916	Aaqaybpuu.exe	Aaqaybpuu.exe
PID 916 wrote to memory of 932	916	Aaqaybpuu.exe	Aaqaybpuu.exe
PID 916 wrote to memory of 932	916	Aaqaybpuu.exe	Aaqaybpuu.exe
PID 916 wrote to memory of 932	916	Aaqaybpuu.exe	Aaqaybpuu.exe

C:\Users\Admin\AppData\Local\Temp\Aaqaybpuu.exe
"C:\Users\Admin\AppData\Local\Temp\Aaqaybpuu.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:916
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ENC cwB0AGEAcgB0AC0AcwBsAGUAZQBwACAALQBzAGUAYwBvAG4AZABzACAAMgAwAA==
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1340
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c powershell -ENC cwBlAHQALQBtAHAAcAByAGUAZgBlAHIAZQBuAGMAZQAgAC0AZQB4AGMAbAB1AHMAaQBvAG4AcABhAHQAaAAgAEMAOgBcAA==
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1976
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    powershell -ENC cwBlAHQALQBtAHAAcAByAGUAZgBlAHIAZQBuAGMAZQAgAC0AZQB4AGMAbAB1AHMAaQBvAG4AcABhAHQAaAAgAEMAOgBcAA==
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:592
- C:\Users\Admin\AppData\Local\Temp\Aaqaybpuu.exe
  C:\Users\Admin\AppData\Local\Temp\Aaqaybpuu.exe
  2⤵
  PID:932

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\d93f411851d7c929.customDestinations-ms

Filesize
7KB

MD5
c75f136533a0843e2f15188ccc85b858

SHA1
a27bd82e65f2891191f1d86909016f7038bd607e

SHA256
fbb01ac5af4745f1cd34559486f41ac7b0fc467fb975b7f10bec28cffe03d916

SHA512
7f68a1b4b2f71cb15011f5d09a3e61ca8bfd073d73356517aacf865c0059b5764b8d379beeb695d5efbe65be5963728c5d02e0d45e5531d5a637dd366b8b1cf6

Download Submit
memory/592-62-0x0000000000000000-mapping.dmp

Download
memory/592-66-0x000000006F670000-0x000000006FC1B000-memory.dmp

Filesize
5.7MB

Download
memory/592-65-0x000000006F670000-0x000000006FC1B000-memory.dmp

Filesize
5.7MB

Download
memory/916-55-0x00000000062D0000-0x0000000006544000-memory.dmp

Filesize
2.5MB

Download
memory/916-54-0x00000000008D0000-0x0000000000DB6000-memory.dmp

Filesize
4.9MB

Download
memory/916-67-0x0000000004CF0000-0x0000000004D3E000-memory.dmp

Filesize
312KB

Download
memory/932-74-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/932-78-0x0000000000413FA4-mapping.dmp

Download
memory/932-83-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/932-82-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/932-81-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/932-77-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/932-68-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/932-69-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/932-71-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/932-73-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/932-75-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/1340-56-0x0000000000000000-mapping.dmp

Download
memory/1340-57-0x0000000076091000-0x0000000076093000-memory.dmp

Filesize
8KB

Download
memory/1340-58-0x000000006F6A0000-0x000000006FC4B000-memory.dmp

Filesize
5.7MB

Download
memory/1340-59-0x000000006F6A0000-0x000000006FC4B000-memory.dmp

Filesize
5.7MB

Download
memory/1340-60-0x000000006F6A0000-0x000000006FC4B000-memory.dmp

Filesize
5.7MB

Download
memory/1976-61-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads