purecrypter | f2aa0bef12799e23505d3589cb4c04feeb5e0af928d10f73144c1fefce3b6abb

General

Target

Purchase Order Inquiry_190123.exe
Size

7KB
MD5

1c72fb093ace75fffb093c6541ff4940
SHA1

7034c12131cc2e28fcf9235850a36b08e9983dce
SHA256

f00982603a693995cf32649df28ac390ce839638751f04d11517454466061785
SHA512

4d713c85e2b5a818e3f5db4c7b59a820bb309c911825670b540597c9faa9d931f5648d054e19a01a48f7c97bae6dfe67b02148fb3ad58ddafdd11bb06f8a59ed
SSDEEP

96:lTlsnKYgr+QLZCMqm18WQ2juY+wq+Df/8tEkajtR/zNt:lpQELZCMqmXjuZ+z8zaj7p

Score

10^/10

purecrypter remcos 28282 downloader loader persistence rat

Malware Config

Extracted

Family

remcos

Botnet

28282

C2

194.180.49.17:28282

Attributes

audio_folder
MicRecords
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
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
gqhwjekrltlu-TOU33Q
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

Signatures

Detect PureCrypter injector 1 IoCs

loader

resource	yara_rule
behavioral1/memory/1456-56-0x0000000006070000-0x000000000630C000-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

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3406023954-474543476-3319432036-1000\Software\Microsoft\Windows\CurrentVersion\Run\Eesibjdz = "\"C:\\Users\\Admin\\AppData\\Roaming\\Gngrey\\Eesibjdz.exe\""	Purchase Order Inquiry_190123.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1456 set thread context of 928	1456	Purchase Order Inquiry_190123.exe	32

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 3 IoCs

pid	Process
584	powershell.exe
1456	Purchase Order Inquiry_190123.exe
1456	Purchase Order Inquiry_190123.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1456	Purchase Order Inquiry_190123.exe
Token: SeDebugPrivilege	584	powershell.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 1456 wrote to memory of 584	1456	Purchase Order Inquiry_190123.exe	28
PID 1456 wrote to memory of 584	1456	Purchase Order Inquiry_190123.exe	28
PID 1456 wrote to memory of 584	1456	Purchase Order Inquiry_190123.exe	28
PID 1456 wrote to memory of 584	1456	Purchase Order Inquiry_190123.exe	28
PID 1456 wrote to memory of 304	1456	Purchase Order Inquiry_190123.exe	31
PID 1456 wrote to memory of 304	1456	Purchase Order Inquiry_190123.exe	31
PID 1456 wrote to memory of 304	1456	Purchase Order Inquiry_190123.exe	31
PID 1456 wrote to memory of 304	1456	Purchase Order Inquiry_190123.exe	31
PID 1456 wrote to memory of 928	1456	Purchase Order Inquiry_190123.exe	32
PID 1456 wrote to memory of 928	1456	Purchase Order Inquiry_190123.exe	32
PID 1456 wrote to memory of 928	1456	Purchase Order Inquiry_190123.exe	32
PID 1456 wrote to memory of 928	1456	Purchase Order Inquiry_190123.exe	32
PID 1456 wrote to memory of 928	1456	Purchase Order Inquiry_190123.exe	32
PID 1456 wrote to memory of 928	1456	Purchase Order Inquiry_190123.exe	32
PID 1456 wrote to memory of 928	1456	Purchase Order Inquiry_190123.exe	32
PID 1456 wrote to memory of 928	1456	Purchase Order Inquiry_190123.exe	32
PID 1456 wrote to memory of 928	1456	Purchase Order Inquiry_190123.exe	32
PID 1456 wrote to memory of 928	1456	Purchase Order Inquiry_190123.exe	32
PID 1456 wrote to memory of 928	1456	Purchase Order Inquiry_190123.exe	32
PID 1456 wrote to memory of 928	1456	Purchase Order Inquiry_190123.exe	32
PID 1456 wrote to memory of 928	1456	Purchase Order Inquiry_190123.exe	32

C:\Users\Admin\AppData\Local\Temp\Purchase Order Inquiry_190123.exe
"C:\Users\Admin\AppData\Local\Temp\Purchase Order Inquiry_190123.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1456
- 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:584
- C:\Users\Admin\AppData\Local\Temp\Purchase Order Inquiry_190123.exe
  "C:\Users\Admin\AppData\Local\Temp\Purchase Order Inquiry_190123.exe"
  2⤵
  PID:304
- C:\Users\Admin\AppData\Local\Temp\Purchase Order Inquiry_190123.exe
  "C:\Users\Admin\AppData\Local\Temp\Purchase Order Inquiry_190123.exe"
  2⤵
  PID:928

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

Replay Monitor

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Downloads

memory/584-59-0x000000006EEC0000-0x000000006F46B000-memory.dmp

Filesize
5.7MB

Download
memory/584-61-0x000000006EEC0000-0x000000006F46B000-memory.dmp

Filesize
5.7MB

Download
memory/584-60-0x000000006EEC0000-0x000000006F46B000-memory.dmp

Filesize
5.7MB

Download
memory/928-66-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/928-70-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/928-81-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/928-80-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/928-63-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/928-64-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/928-79-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/928-68-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/928-69-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/928-71-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/928-73-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/928-75-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1456-56-0x0000000006070000-0x000000000630C000-memory.dmp

Filesize
2.6MB

Download
memory/1456-54-0x0000000000220000-0x0000000000228000-memory.dmp

Filesize
32KB

Download
memory/1456-62-0x0000000005020000-0x00000000050A0000-memory.dmp

Filesize
512KB

Download
memory/1456-55-0x0000000075C81000-0x0000000075C83000-memory.dmp

Filesize
8KB

Download

Analysis

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