MalwareBazaar Database
You are currently viewing the MalwareBazaar entry for SHA256 4a5ac3c6f8383cc33c795804ba5f7f5553c029bbb4a6d28f1e4d8fb5107902c1. While MalwareBazaar tries to identify whether the sample provided is malicious or not, there is no guarantee that a sample in MalwareBazaar is malicious.
Database Entry
MountLocker
Vendor detections: 9
| SHA256 hash: | 4a5ac3c6f8383cc33c795804ba5f7f5553c029bbb4a6d28f1e4d8fb5107902c1 |
|---|---|
| SHA3-384 hash: | 43fc1427baf927299c86b0f32735b1389f11f929a90d5c1b13922c275bac49208076f331bc35ee8af7204ac74fc9ac0f |
| SHA1 hash: | 93cc73149d4bb34830a2cb2a3047e9267b9e3080 |
| MD5 hash: | 3808f21e56dede99bc914d90aeabe47a |
| humanhash: | colorado-summer-foxtrot-seventeen |
| File name: | 3808f21e_by_Libranalysis |
| Download: | download sample |
| Signature | MountLocker |
| File size: | 68'096 bytes |
| First seen: | 2021-05-12 13:01:35 UTC |
| Last seen: | 2022-01-09 14:18:59 UTC |
| File type: |  exe |
| MIME type: | application/x-dosexec |
| imphash | 608bd80057d3a5e8811535ac9a9eb381 (2 x MountLocker) |
| ssdeep | 768:BS5zkUtPX/y4Jp5LmcmItHnlIH9q9Q/048RgauHADOC8:DaXq4xTlIdYrhRcHC8 |
| TLSH | AD63194253F50298F1B35A74ECF244B2E7B3B461A474C34F1294D5AA1FB2980AE67F63 |
| Reporter |  Libranalysis |
| Tags: | MountLocker |
Intelligence
File Origin
# of uploads :
2
# of downloads :
294
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
xxxx.exe
Verdict:
No threats detected
Analysis date:
2021-05-12 16:18:04 UTC
Tags:
n/a
Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
Mountlocker
Detection(s):
Result
Verdict:
Malware
Maliciousness:
Behaviour
Creating a file
Creating a file in the Program Files directory
Creating a file in the Program Files subdirectories
Changing a file
Creating a file in the %AppData% subdirectories
Replacing files
Sending a UDP request
Moving a file to the %AppData% subdirectory
Creating a file in the %temp% directory
Running batch commands
Creating a process with a hidden window
Launching a process
Enabling autorun with the shell\open\command registry branches
Creating a file in the mass storage device
Result
Verdict:
MALICIOUS
Details
Windows PE Executable
Found a Windows Portable Executable (PE) binary. Depending on context, the presence of a binary is suspicious or malicious.
Result
Threat name:
Unknown
Detection:
malicious
Classification:
rans.evad
Score:
76 / 100
Signature
Contains functionality to compare user and computer (likely to detect sandboxes)
Found Tor onion address
Modifies existing user documents (likely ransomware behavior)
Multi AV Scanner detection for submitted file
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Tries to detect virtualization through RDTSC time measurements
Writes a notice file (html or txt) to demand a ransom
Writes many files with high entropy
Behaviour
Behavior Graph:
Threat name:
Win64.Ransomware.Generic
Status:
Suspicious
First seen:
2021-05-12 00:43:57 UTC
AV detection:
13 of 47 (27.66%)
Threat level:
5/5
Detection(s):
Suspicious file
Verdict:
unknown
Result
Malware family:
mountlocker
Score:
10/10
Tags:
family:mountlocker ransomware
Behaviour
Modifies registry class
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Views/modifies file attributes
Drops file in Program Files directory
Drops desktop.ini file(s)
Deletes itself
Modifies extensions of user files
MountLocker Ransomware
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
1.00
YARA Signatures
MalwareBazaar uses YARA rules from several public and non-public repositories, such as YARAhub and Malpedia. Those are being matched against malware samples uploaded to MalwareBazaar as well as against any suspicious process dumps they may create. Please note that only results from TLP:CLEAR rules are being displayed.
| Rule name: | RANSOM_mountlocker |
|---|---|
| Author: | McAfee ATR Team |
| Description: | Rule to detect Mount Locker ransomware |
File information
The table below shows additional information about this malware sample such as delivery method and external references.
Comments
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MBC behaviors list (github.com/accidentalrebel/mbcscan):
============================================================
0) [B0001.032] Anti-Behavioral Analysis::Timing/Delay Check GetTickCount
1) [B0001.033] Anti-Behavioral Analysis::Timing/Delay Check QueryPerformanceCounter
2) [C0031] Cryptography Micro-objective::Decrypt Data
3) [C0027] Cryptography Micro-objective::Encrypt Data
4) [C0028] Cryptography Micro-objective::Encryption Key
5) [C0026.002] Data Micro-objective::XOR::Encode Data
7) [B0013.001] Discovery::Process detection
8) [C0045] File System Micro-objective::Copy File
9) [C0047] File System Micro-objective::Delete File
10) [C0051] File System Micro-objective::Read File
11) [C0050] File System Micro-objective::Set File Attributes
12) [C0052] File System Micro-objective::Writes File
13) [C0033] Operating System Micro-objective::Console
14) [C0036.001] Operating System Micro-objective::Set Registry Key::Registry
15) [C0040] Process Micro-objective::Allocate Thread Local Storage
16) [C0017] Process Micro-objective::Create Process
17) [C0038] Process Micro-objective::Create Thread
18) [C0041] Process Micro-objective::Set Thread Local Storage Value
19) [C0018] Process Micro-objective::Terminate Process
20) [C0039] Process Micro-objective::Terminate Thread