purecrypter | 53ddb9a75bca1115a66745b28086afbd394cef38f8437dda641b1219111df8cd

Analysis

max time kernel
150s
max time network
149s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
03/02/2023, 18:49

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General

Target

d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe
Size

7KB
MD5

b359f4af5c88b1e237db9738415b7682
SHA1

d7fa6d87594ea4d8b5740d54fdc204b08f4e9439
SHA256

53ddb9a75bca1115a66745b28086afbd394cef38f8437dda641b1219111df8cd
SHA512

6d4f06f36c608d3202d29629f9d9a70eadfbffbb23c7c074fbb610ed9e1926bf6e04c8dfecbbaf1d575fb2d0385d237aff2dbda322b092d4ef7728091eb596cb
SSDEEP

96:xtEsKVeCVIP7bLp8LAn5c8aY1ej/kKV+J2qzNt:xUVVIP7bLrEOejcKYx

Score

10^/10

purecrypter remcos remotehost downloader loader persistence rat

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

194.180.49.17:28282

Attributes

audio_folder
MicRecords
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
rdfghfgjkgoighjc.exe
copy_folder
Remcos
delete_file
false
hide_file
false
hide_keylog_file
false
install_flag
true
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-PC1DJ2
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/2008-56-0x0000000007330000-0x00000000075CE000-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

Executes dropped EXE 3 IoCs

pid	Process
1080	rdfghfgjkgoighjc.exe
1748	rdfghfgjkgoighjc.exe
1872	rdfghfgjkgoighjc.exe

Loads dropped DLL 1 IoCs

pid	Process
924	d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe

Adds Run key to start application 2 TTPs 10 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000\Software\Microsoft\Windows\CurrentVersion\Run\Phecxlkxbf = "\"C:\\Users\\Admin\\AppData\\Roaming\\Zwpfblvosjv\\Phecxlkxbf.exe\""	d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe
Key created	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000\Software\Microsoft\Windows\CurrentVersion\Run\	d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000\Software\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\ProgramData\\Remcos\\rdfghfgjkgoighjc.exe\""	d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\	d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\	rdfghfgjkgoighjc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\ProgramData\\Remcos\\rdfghfgjkgoighjc.exe\""	rdfghfgjkgoighjc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\ProgramData\\Remcos\\rdfghfgjkgoighjc.exe\""	d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000\Software\Microsoft\Windows\CurrentVersion\Run\Phecxlkxbf = "\"C:\\Users\\Admin\\AppData\\Roaming\\Zwpfblvosjv\\Phecxlkxbf.exe\""	rdfghfgjkgoighjc.exe
Key created	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000\Software\Microsoft\Windows\CurrentVersion\Run\	rdfghfgjkgoighjc.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000\Software\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\ProgramData\\Remcos\\rdfghfgjkgoighjc.exe\""	rdfghfgjkgoighjc.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2008 set thread context of 924	2008	d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe	28
PID 1080 set thread context of 1872	1080	rdfghfgjkgoighjc.exe	33

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
940	powershell.exe
1956	powershell.exe
1080	rdfghfgjkgoighjc.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	2008	d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe
Token: SeDebugPrivilege	940	powershell.exe
Token: SeDebugPrivilege	1080	rdfghfgjkgoighjc.exe
Token: SeDebugPrivilege	1956	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1872	rdfghfgjkgoighjc.exe

Suspicious use of WriteProcessMemory 42 IoCs

description	pid	Process	procid_target
PID 2008 wrote to memory of 940	2008	d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe	26
PID 2008 wrote to memory of 940	2008	d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe	26
PID 2008 wrote to memory of 940	2008	d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe	26
PID 2008 wrote to memory of 940	2008	d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe	26
PID 2008 wrote to memory of 924	2008	d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe	28
PID 2008 wrote to memory of 924	2008	d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe	28
PID 2008 wrote to memory of 924	2008	d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe	28
PID 2008 wrote to memory of 924	2008	d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe	28
PID 2008 wrote to memory of 924	2008	d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe	28
PID 2008 wrote to memory of 924	2008	d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe	28
PID 2008 wrote to memory of 924	2008	d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe	28
PID 2008 wrote to memory of 924	2008	d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe	28
PID 2008 wrote to memory of 924	2008	d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe	28
PID 2008 wrote to memory of 924	2008	d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe	28
PID 2008 wrote to memory of 924	2008	d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe	28
PID 2008 wrote to memory of 924	2008	d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe	28
PID 2008 wrote to memory of 924	2008	d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe	28
PID 924 wrote to memory of 1080	924	d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe	29
PID 924 wrote to memory of 1080	924	d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe	29
PID 924 wrote to memory of 1080	924	d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe	29
PID 924 wrote to memory of 1080	924	d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe	29
PID 1080 wrote to memory of 1956	1080	rdfghfgjkgoighjc.exe	30
PID 1080 wrote to memory of 1956	1080	rdfghfgjkgoighjc.exe	30
PID 1080 wrote to memory of 1956	1080	rdfghfgjkgoighjc.exe	30
PID 1080 wrote to memory of 1956	1080	rdfghfgjkgoighjc.exe	30
PID 1080 wrote to memory of 1748	1080	rdfghfgjkgoighjc.exe	32
PID 1080 wrote to memory of 1748	1080	rdfghfgjkgoighjc.exe	32
PID 1080 wrote to memory of 1748	1080	rdfghfgjkgoighjc.exe	32
PID 1080 wrote to memory of 1748	1080	rdfghfgjkgoighjc.exe	32
PID 1080 wrote to memory of 1872	1080	rdfghfgjkgoighjc.exe	33
PID 1080 wrote to memory of 1872	1080	rdfghfgjkgoighjc.exe	33
PID 1080 wrote to memory of 1872	1080	rdfghfgjkgoighjc.exe	33
PID 1080 wrote to memory of 1872	1080	rdfghfgjkgoighjc.exe	33
PID 1080 wrote to memory of 1872	1080	rdfghfgjkgoighjc.exe	33
PID 1080 wrote to memory of 1872	1080	rdfghfgjkgoighjc.exe	33
PID 1080 wrote to memory of 1872	1080	rdfghfgjkgoighjc.exe	33
PID 1080 wrote to memory of 1872	1080	rdfghfgjkgoighjc.exe	33
PID 1080 wrote to memory of 1872	1080	rdfghfgjkgoighjc.exe	33
PID 1080 wrote to memory of 1872	1080	rdfghfgjkgoighjc.exe	33
PID 1080 wrote to memory of 1872	1080	rdfghfgjkgoighjc.exe	33
PID 1080 wrote to memory of 1872	1080	rdfghfgjkgoighjc.exe	33
PID 1080 wrote to memory of 1872	1080	rdfghfgjkgoighjc.exe	33

C:\Users\Admin\AppData\Local\Temp\d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe
"C:\Users\Admin\AppData\Local\Temp\d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2008
- 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:940
- C:\Users\Admin\AppData\Local\Temp\d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe
  C:\Users\Admin\AppData\Local\Temp\d7fa6d87594ea4d8b5740d54fdc204b08f4e9439.exe
  2⤵
  - Loads dropped DLL
  - Adds Run key to start application
  - Suspicious use of WriteProcessMemory
  PID:924
- - C:\ProgramData\Remcos\rdfghfgjkgoighjc.exe
    "C:\ProgramData\Remcos\rdfghfgjkgoighjc.exe"
    3⤵
    - Executes dropped EXE
    - Adds Run key to start application
    - Suspicious use of SetThreadContext
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:1080
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ENC cwB0AGEAcgB0AC0AcwBsAGUAZQBwACAALQBzAGUAYwBvAG4AZABzACAAMgAwAA==
      4⤵
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:1956
  - - C:\ProgramData\Remcos\rdfghfgjkgoighjc.exe
      C:\ProgramData\Remcos\rdfghfgjkgoighjc.exe
      4⤵
      Executes dropped EXE
      PID:1748
  - - C:\ProgramData\Remcos\rdfghfgjkgoighjc.exe
      C:\ProgramData\Remcos\rdfghfgjkgoighjc.exe
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      Suspicious use of SetWindowsHookEx
      PID:1872

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\ProgramData\Remcos\rdfghfgjkgoighjc.exe

Filesize
7KB

MD5
b359f4af5c88b1e237db9738415b7682

SHA1
d7fa6d87594ea4d8b5740d54fdc204b08f4e9439

SHA256
53ddb9a75bca1115a66745b28086afbd394cef38f8437dda641b1219111df8cd

SHA512
6d4f06f36c608d3202d29629f9d9a70eadfbffbb23c7c074fbb610ed9e1926bf6e04c8dfecbbaf1d575fb2d0385d237aff2dbda322b092d4ef7728091eb596cb

Download Submit
C:\ProgramData\Remcos\rdfghfgjkgoighjc.exe

Filesize
7KB

MD5
b359f4af5c88b1e237db9738415b7682

SHA1
d7fa6d87594ea4d8b5740d54fdc204b08f4e9439

SHA256
53ddb9a75bca1115a66745b28086afbd394cef38f8437dda641b1219111df8cd

SHA512
6d4f06f36c608d3202d29629f9d9a70eadfbffbb23c7c074fbb610ed9e1926bf6e04c8dfecbbaf1d575fb2d0385d237aff2dbda322b092d4ef7728091eb596cb

Download Submit
C:\ProgramData\Remcos\rdfghfgjkgoighjc.exe

Filesize
7KB

MD5
b359f4af5c88b1e237db9738415b7682

SHA1
d7fa6d87594ea4d8b5740d54fdc204b08f4e9439

SHA256
53ddb9a75bca1115a66745b28086afbd394cef38f8437dda641b1219111df8cd

SHA512
6d4f06f36c608d3202d29629f9d9a70eadfbffbb23c7c074fbb610ed9e1926bf6e04c8dfecbbaf1d575fb2d0385d237aff2dbda322b092d4ef7728091eb596cb

Download Submit
C:\ProgramData\Remcos\rdfghfgjkgoighjc.exe

Filesize
7KB

MD5
b359f4af5c88b1e237db9738415b7682

SHA1
d7fa6d87594ea4d8b5740d54fdc204b08f4e9439

SHA256
53ddb9a75bca1115a66745b28086afbd394cef38f8437dda641b1219111df8cd

SHA512
6d4f06f36c608d3202d29629f9d9a70eadfbffbb23c7c074fbb610ed9e1926bf6e04c8dfecbbaf1d575fb2d0385d237aff2dbda322b092d4ef7728091eb596cb

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

Filesize
7KB

MD5
b90126aef2c0f27ec479d24425e74323

SHA1
d9558ca1f433d0b2c88e4b0224a06729bb316509

SHA256
c8e6d79f8e269e2cafe08b93ede2a2435623045b427616266c45f170e4f3d368

SHA512
058d632446fb4c3be1bde001160bc20fb38e4deff3da004d1754f3ea1797e0fabe5a692a9cc8fe664bb4cfc2a4f3c4c8a209e3407a56790201007b8296590e8a

Download Submit
C:\Users\Admin\AppData\Roaming\Zwpfblvosjv\Phecxlkxbf.exe

Filesize
7KB

MD5
b359f4af5c88b1e237db9738415b7682

SHA1
d7fa6d87594ea4d8b5740d54fdc204b08f4e9439

SHA256
53ddb9a75bca1115a66745b28086afbd394cef38f8437dda641b1219111df8cd

SHA512
6d4f06f36c608d3202d29629f9d9a70eadfbffbb23c7c074fbb610ed9e1926bf6e04c8dfecbbaf1d575fb2d0385d237aff2dbda322b092d4ef7728091eb596cb

Download Submit
\ProgramData\Remcos\rdfghfgjkgoighjc.exe

Filesize
7KB

MD5
b359f4af5c88b1e237db9738415b7682

SHA1
d7fa6d87594ea4d8b5740d54fdc204b08f4e9439

SHA256
53ddb9a75bca1115a66745b28086afbd394cef38f8437dda641b1219111df8cd

SHA512
6d4f06f36c608d3202d29629f9d9a70eadfbffbb23c7c074fbb610ed9e1926bf6e04c8dfecbbaf1d575fb2d0385d237aff2dbda322b092d4ef7728091eb596cb

Download Submit
memory/924-79-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/924-71-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/924-64-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/924-66-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/924-68-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/924-69-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/924-70-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/924-63-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/924-73-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/924-75-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/924-83-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/940-59-0x000000006EC40000-0x000000006F1EB000-memory.dmp

Filesize
5.7MB

Download
memory/940-61-0x000000006EC40000-0x000000006F1EB000-memory.dmp

Filesize
5.7MB

Download
memory/940-60-0x000000006EC40000-0x000000006F1EB000-memory.dmp

Filesize
5.7MB

Download
memory/1080-85-0x0000000000BB0000-0x0000000000BB8000-memory.dmp

Filesize
32KB

Download
memory/1872-112-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/1872-113-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/1956-90-0x000000006EC20000-0x000000006F1CB000-memory.dmp

Filesize
5.7MB

Download
memory/1956-91-0x000000006EC20000-0x000000006F1CB000-memory.dmp

Filesize
5.7MB

Download
memory/1956-92-0x000000006EC20000-0x000000006F1CB000-memory.dmp

Filesize
5.7MB

Download
memory/2008-62-0x0000000004D60000-0x0000000004DE0000-memory.dmp

Filesize
512KB

Download
memory/2008-54-0x0000000000D40000-0x0000000000D48000-memory.dmp

Filesize
32KB

Download
memory/2008-56-0x0000000007330000-0x00000000075CE000-memory.dmp

Filesize
2.6MB

Download
memory/2008-55-0x0000000074D81000-0x0000000074D83000-memory.dmp

Filesize
8KB

Download