purecrypter | 13df95cc4f92ffd056e353d26493f69b53667970de247808b7f1e2de95dae364

Analysis

max time kernel
57s
max time network
74s
platform
windows10-2004_x64
resource
win10v2004-20230221-en
resource tags

arch:x64arch:x86image:win10v2004-20230221-enlocale:en-usos:windows10-2004-x64system
submitted
23-02-2023 09:08

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General

Target

tmp.exe
Size

7KB
MD5

45cd89fa28924bd2390d6948d1ee11f6
SHA1

75110b387762c2f59116fef0709d2a5d23e13c2d
SHA256

13df95cc4f92ffd056e353d26493f69b53667970de247808b7f1e2de95dae364
SHA512

1e24fb83b702eb66f5d4fe8df2ff761d42c5fb44ff7bca0342a9d0b0055f0493b6e1b0686d733878ee6172ff73ab64d50750a0f2f88822a77f088e4c0f0fc6d9
SSDEEP

96:UoFQgbeMBVLPCyWUyxtL9UvpvR5IMvW+7f7LEkQWQQCjzNt:UoFhyMfyxtL+tfhvfLtZQpl

Score

10^/10

purecrypter downloader loader persistence

Malware Config

Extracted

Family

purecrypter

https://naadhira.store/panel/uploads/services_Cuepxqhr.jpg

Signatures

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2805025096-2326403612-4231045514-1000\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe,\"C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Windows\\Start Menu\\Programs\\System32\\RuntimeBroker.exe\","	tmp.exe

PureCrypter
PureCrypter is a .NET malware loader first seen in early 2021.
loader downloader purecrypter

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-1-5-21-2805025096-2326403612-4231045514-1000\Control Panel\International\Geo\Nation	tmp.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4928 set thread context of 1888	4928	tmp.exe	82

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 4 IoCs

pid	Process
2636	powershell.exe
2636	powershell.exe
1432	powershell.exe
1432	powershell.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	4928	tmp.exe
Token: SeDebugPrivilege	2636	powershell.exe
Token: SeDebugPrivilege	1888	tmp.exe
Token: SeDebugPrivilege	1432	powershell.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 4928 wrote to memory of 2636	4928	tmp.exe	80
PID 4928 wrote to memory of 2636	4928	tmp.exe	80
PID 4928 wrote to memory of 2636	4928	tmp.exe	80
PID 4928 wrote to memory of 1888	4928	tmp.exe	82
PID 4928 wrote to memory of 1888	4928	tmp.exe	82
PID 4928 wrote to memory of 1888	4928	tmp.exe	82
PID 4928 wrote to memory of 1888	4928	tmp.exe	82
PID 4928 wrote to memory of 1888	4928	tmp.exe	82
PID 4928 wrote to memory of 1888	4928	tmp.exe	82
PID 4928 wrote to memory of 1888	4928	tmp.exe	82
PID 4928 wrote to memory of 1888	4928	tmp.exe	82
PID 1888 wrote to memory of 1432	1888	tmp.exe	83
PID 1888 wrote to memory of 1432	1888	tmp.exe	83
PID 1888 wrote to memory of 1432	1888	tmp.exe	83

C:\Users\Admin\AppData\Local\Temp\tmp.exe
"C:\Users\Admin\AppData\Local\Temp\tmp.exe"
1⤵
- Modifies WinLogon for persistence
- Checks computer location settings
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4928
- 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:2636
- C:\Users\Admin\AppData\Local\Temp\tmp.exe
  C:\Users\Admin\AppData\Local\Temp\tmp.exe
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1888
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "powershell" $defenderSettings = Get-MpPreference;$defenderSettings.ExclusionPath
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1432

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

T1004

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\powershell.exe.log

Filesize
1KB

MD5
4280e36a29fa31c01e4d8b2ba726a0d8

SHA1
c485c2c9ce0a99747b18d899b71dfa9a64dabe32

SHA256
e2486a1bdcba80dad6dd6210d7374bd70ae196a523c06ceda71370fd3ea78359

SHA512
494fe5f0ade03669e5830bed93c964d69b86629440148d7b0881cf53203fd89443ebff9b4d1ee9d96244f62af6edede622d9eacba37f80f389a0d522e4ad4ea4

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\tmp.exe.log

Filesize
1KB

MD5
3a9188331a78f1dbce606db64b841fcb

SHA1
8e2c99b7c477d06591a856a4ea3e1e214719eee8

SHA256
db4137e258a0f6159fda559a5f6dd2704be0582c3f0586f65040c7ad1eb68451

SHA512
d1a994610a045d89d5d306866c24ae56bf16555414b8f63f632552568e67b5586f26d5a17a1f0a55ada376730298e6d856e9161828d4eae9decfa4e015e0e90a

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\ModuleAnalysisCache

Filesize
53KB

MD5
06ad34f9739c5159b4d92d702545bd49

SHA1
9152a0d4f153f3f40f7e606be75f81b582ee0c17

SHA256
474813b625f00710f29fa3b488235a6a22201851efb336bddf60d7d24a66bfba

SHA512
c272cd28ae164d465b779163ba9eca6a28261376414c6bbdfbd9f2128adb7f7ff1420e536b4d6000d0301ded2ec9036bc5c657588458bff41f176bdce8d74f92

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
16KB

MD5
9ee842f0009b407f7f622b677a371aee

SHA1
bcbd3bec62a9b3228441bfa018a544712b42bb84

SHA256
84bb4c27b017fa1e404d5b78cb8824ac4c75c53897fbcbcef209252cf853a925

SHA512
76a51a4943abf1afae2aa54e0dbaed681a68de96e2a84c60fa6933b9c6b40171c9d1773d262fe95fb6cbadfbfbac8858153a2d05017f24931dfe605bb4143e6c

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_13mwj1m0.bk0.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1432-1086-0x0000000007930000-0x000000000793A000-memory.dmp

Filesize
40KB

Download
memory/1432-1087-0x000000007F9A0000-0x000000007F9B0000-memory.dmp

Filesize
64KB

Download
memory/1432-1088-0x0000000002C10000-0x0000000002C20000-memory.dmp

Filesize
64KB

Download
memory/1432-1089-0x0000000007B20000-0x0000000007BB6000-memory.dmp

Filesize
600KB

Download
memory/1432-1085-0x0000000006AE0000-0x0000000006AFE000-memory.dmp

Filesize
120KB

Download
memory/1432-1075-0x0000000070E70000-0x0000000070EBC000-memory.dmp

Filesize
304KB

Download
memory/1432-1074-0x00000000077A0000-0x00000000077D2000-memory.dmp

Filesize
200KB

Download
memory/1432-1073-0x0000000002C10000-0x0000000002C20000-memory.dmp

Filesize
64KB

Download
memory/1432-1090-0x0000000006410000-0x000000000641E000-memory.dmp

Filesize
56KB

Download
memory/1432-1091-0x0000000007AC0000-0x0000000007ADA000-memory.dmp

Filesize
104KB

Download
memory/1432-1092-0x0000000007AB0000-0x0000000007AB8000-memory.dmp

Filesize
32KB

Download
memory/1888-220-0x0000000004D50000-0x0000000004DFF000-memory.dmp

Filesize
700KB

Download
memory/1888-206-0x0000000004D50000-0x0000000004DFF000-memory.dmp

Filesize
700KB

Download
memory/1888-163-0x0000000000400000-0x0000000000484000-memory.dmp

Filesize
528KB

Download
memory/1888-228-0x0000000004D50000-0x0000000004DFF000-memory.dmp

Filesize
700KB

Download
memory/1888-166-0x0000000004D50000-0x0000000004DFF000-memory.dmp

Filesize
700KB

Download
memory/1888-167-0x0000000004D50000-0x0000000004DFF000-memory.dmp

Filesize
700KB

Download
memory/1888-169-0x0000000004D50000-0x0000000004DFF000-memory.dmp

Filesize
700KB

Download
memory/1888-171-0x0000000004D50000-0x0000000004DFF000-memory.dmp

Filesize
700KB

Download
memory/1888-173-0x0000000004D50000-0x0000000004DFF000-memory.dmp

Filesize
700KB

Download
memory/1888-175-0x0000000004D50000-0x0000000004DFF000-memory.dmp

Filesize
700KB

Download
memory/1888-177-0x0000000004D50000-0x0000000004DFF000-memory.dmp

Filesize
700KB

Download
memory/1888-179-0x0000000004D50000-0x0000000004DFF000-memory.dmp

Filesize
700KB

Download
memory/1888-181-0x0000000004D50000-0x0000000004DFF000-memory.dmp

Filesize
700KB

Download
memory/1888-183-0x0000000004D50000-0x0000000004DFF000-memory.dmp

Filesize
700KB

Download
memory/1888-185-0x0000000004D50000-0x0000000004DFF000-memory.dmp

Filesize
700KB

Download
memory/1888-188-0x0000000004D40000-0x0000000004D50000-memory.dmp

Filesize
64KB

Download
memory/1888-187-0x0000000004D50000-0x0000000004DFF000-memory.dmp

Filesize
700KB

Download
memory/1888-190-0x0000000004D50000-0x0000000004DFF000-memory.dmp

Filesize
700KB

Download
memory/1888-192-0x0000000004D50000-0x0000000004DFF000-memory.dmp

Filesize
700KB

Download
memory/1888-194-0x0000000004D50000-0x0000000004DFF000-memory.dmp

Filesize
700KB

Download
memory/1888-196-0x0000000004D50000-0x0000000004DFF000-memory.dmp

Filesize
700KB

Download
memory/1888-198-0x0000000004D50000-0x0000000004DFF000-memory.dmp

Filesize
700KB

Download
memory/1888-200-0x0000000004D50000-0x0000000004DFF000-memory.dmp

Filesize
700KB

Download
memory/1888-202-0x0000000004D50000-0x0000000004DFF000-memory.dmp

Filesize
700KB

Download
memory/1888-204-0x0000000004D50000-0x0000000004DFF000-memory.dmp

Filesize
700KB

Download
memory/1888-226-0x0000000004D50000-0x0000000004DFF000-memory.dmp

Filesize
700KB

Download
memory/1888-208-0x0000000004D50000-0x0000000004DFF000-memory.dmp

Filesize
700KB

Download
memory/1888-210-0x0000000004D50000-0x0000000004DFF000-memory.dmp

Filesize
700KB

Download
memory/1888-212-0x0000000004D50000-0x0000000004DFF000-memory.dmp

Filesize
700KB

Download
memory/1888-214-0x0000000004D50000-0x0000000004DFF000-memory.dmp

Filesize
700KB

Download
memory/1888-216-0x0000000004D50000-0x0000000004DFF000-memory.dmp

Filesize
700KB

Download
memory/1888-218-0x0000000004D50000-0x0000000004DFF000-memory.dmp

Filesize
700KB

Download
memory/1888-224-0x0000000004D50000-0x0000000004DFF000-memory.dmp

Filesize
700KB

Download
memory/1888-222-0x0000000004D50000-0x0000000004DFF000-memory.dmp

Filesize
700KB

Download
memory/2636-138-0x00000000058E0000-0x0000000005946000-memory.dmp

Filesize
408KB

Download
memory/2636-137-0x0000000005B30000-0x0000000006158000-memory.dmp

Filesize
6.2MB

Download
memory/2636-151-0x0000000006800000-0x000000000681E000-memory.dmp

Filesize
120KB

Download
memory/2636-156-0x00000000054F0000-0x0000000005500000-memory.dmp

Filesize
64KB

Download
memory/2636-150-0x00000000054F0000-0x0000000005500000-memory.dmp

Filesize
64KB

Download
memory/2636-154-0x00000000054F0000-0x0000000005500000-memory.dmp

Filesize
64KB

Download
memory/2636-153-0x0000000006CF0000-0x0000000006D0A000-memory.dmp

Filesize
104KB

Download
memory/2636-149-0x00000000054F0000-0x0000000005500000-memory.dmp

Filesize
64KB

Download
memory/2636-157-0x00000000054F0000-0x0000000005500000-memory.dmp

Filesize
64KB

Download
memory/2636-136-0x0000000003220000-0x0000000003256000-memory.dmp

Filesize
216KB

Download
memory/2636-152-0x0000000007E50000-0x00000000084CA000-memory.dmp

Filesize
6.5MB

Download
memory/2636-139-0x00000000059C0000-0x0000000005A26000-memory.dmp

Filesize
408KB

Download
memory/2636-158-0x00000000054F0000-0x0000000005500000-memory.dmp

Filesize
64KB

Download
memory/4928-133-0x0000000000D00000-0x0000000000D08000-memory.dmp

Filesize
32KB

Download
memory/4928-155-0x0000000005700000-0x0000000005710000-memory.dmp

Filesize
64KB

Download
memory/4928-135-0x0000000006D70000-0x0000000006D92000-memory.dmp

Filesize
136KB

Download
memory/4928-134-0x0000000005700000-0x0000000005710000-memory.dmp

Filesize
64KB

Download