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Windows
Analysis Report
mU2p71KMss.exe
Overview
General Information
| Sample name: | mU2p71KMss.exerenamed because original name is a hash value |
| Original sample name: | e9ff14a975f084f01373d468c0b91a16.exe |
| Analysis ID: | 1431118 |
| MD5: | e9ff14a975f084f01373d468c0b91a16 |
| SHA1: | 302d4b9f88ae7b085b56661774d6805156039924 |
| SHA256: | f6a6765642f0f8c4b81f45d4e1a9f65505432bbf4c249fa3c96b82d9c712effe |
| Tags: | exeStop |
| Infos: |   |
 | |
Detection
Babuk, Djvu
| Score: | 100 |
| Range: | 0 - 100 |
| Whitelisted: | false |
| Confidence: | 100% |
Signatures
Antivirus / Scanner detection for submitted sample
Antivirus detection for dropped file
Detected unpacking (changes PE section rights)
Detected unpacking (overwrites its own PE header)
Found malware configuration
Found ransom note / readme
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for dropped file
Snort IDS alert for network traffic
Yara detected Babuk Ransomware
Yara detected Djvu Ransomware
C2 URLs / IPs found in malware configuration
Contains functionality to inject code into remote processes
Injects a PE file into a foreign processes
Machine Learning detection for dropped file
Machine Learning detection for sample
Modifies existing user documents (likely ransomware behavior)
Writes a notice file (html or txt) to demand a ransom
Contains functionality for execution timing, often used to detect debuggers
Contains functionality to call native functions
Contains functionality to check if a debugger is running (IsDebuggerPresent)
Contains functionality to check if a debugger is running (OutputDebugString,GetLastError)
Contains functionality to dynamically determine API calls
Contains functionality to launch a program with higher privileges
Contains functionality to query CPU information (cpuid)
Contains functionality to query locales information (e.g. system language)
Contains functionality to query network adapater information
Contains functionality to read the PEB
Contains functionality to record screenshots
Contains functionality which may be used to detect a debugger (GetProcessHeap)
Creates a process in suspended mode (likely to inject code)
Detected potential crypto function
Drops PE files
Extensive use of GetProcAddress (often used to hide API calls)
Found dropped PE file which has not been started or loaded
Found evasive API chain (may stop execution after checking a module file name)
Found large amount of non-executed APIs
Found potential string decryption / allocating functions
IP address seen in connection with other malware
Internet Provider seen in connection with other malware
JA3 SSL client fingerprint seen in connection with other malware
Monitors certain registry keys / values for changes (often done to protect autostart functionality)
Sample file is different than original file name gathered from version info
Sigma detected: CurrentVersion Autorun Keys Modification
Uses 32bit PE files
Uses Microsoft's Enhanced Cryptographic Provider
Uses cacls to modify the permissions of files
Uses code obfuscation techniques (call, push, ret)
Yara signature match
Classification
- System is w10x64
mU2p71KMss.exe (PID: 348 cmdline: "C:\Users\ user\Deskt op\mU2p71K Mss.exe" MD5: E9FF14A975F084F01373D468C0B91A16) - mU2p71KMss.exe (PID: 2716 cmdline:
"C:\Users\ user\Deskt op\mU2p71K Mss.exe" MD5: E9FF14A975F084F01373D468C0B91A16) 
icacls.exe (PID: 1308 cmdline: icacls "C: \Users\use r\AppData\ Local\f261 f702-1524- 4c10-82ff- 88b548e011 7a" /deny *S-1-1-0:( OI)(CI)(DE ,DC) MD5: 2E49585E4E08565F52090B144062F97E) - mU2p71KMss.exe (PID: 1896 cmdline:
"C:\Users\ user\Deskt op\mU2p71K Mss.exe" - -Admin IsN otAutoStar t IsNotTas k MD5: E9FF14A975F084F01373D468C0B91A16) - mU2p71KMss.exe (PID: 5968 cmdline:
"C:\Users\ user\Deskt op\mU2p71K Mss.exe" - -Admin IsN otAutoStar t IsNotTas k MD5: E9FF14A975F084F01373D468C0B91A16)
- mU2p71KMss.exe (PID: 2828 cmdline:
C:\Users\u ser\AppDat a\Local\f2 61f702-152 4-4c10-82f f-88b548e0 117a\mU2p7 1KMss.exe --Task MD5: E9FF14A975F084F01373D468C0B91A16) - mU2p71KMss.exe (PID: 2164 cmdline:
C:\Users\u ser\AppDat a\Local\f2 61f702-152 4-4c10-82f f-88b548e0 117a\mU2p7 1KMss.exe --Task MD5: E9FF14A975F084F01373D468C0B91A16)
- mU2p71KMss.exe (PID: 5524 cmdline:
"C:\Users\ user\AppDa ta\Local\f 261f702-15 24-4c10-82 ff-88b548e 0117a\mU2p 71KMss.exe " --AutoSt art MD5: E9FF14A975F084F01373D468C0B91A16) - mU2p71KMss.exe (PID: 4748 cmdline:
"C:\Users\ user\AppDa ta\Local\f 261f702-15 24-4c10-82 ff-88b548e 0117a\mU2p 71KMss.exe " --AutoSt art MD5: E9FF14A975F084F01373D468C0B91A16)
- mU2p71KMss.exe (PID: 4144 cmdline:
"C:\Users\ user\AppDa ta\Local\f 261f702-15 24-4c10-82 ff-88b548e 0117a\mU2p 71KMss.exe " --AutoSt art MD5: E9FF14A975F084F01373D468C0B91A16) - mU2p71KMss.exe (PID: 2616 cmdline:
"C:\Users\ user\AppDa ta\Local\f 261f702-15 24-4c10-82 ff-88b548e 0117a\mU2p 71KMss.exe " --AutoSt art MD5: E9FF14A975F084F01373D468C0B91A16)
- cleanup
| Name | Description | Attribution | Blogpost URLs | Link |
|---|---|---|---|---|
| Babuk | Babuk Ransomware is a sophisticated ransomware compiled for several platforms. Windows and ARM for Linux are the most used compiled versions, but ESX and a 32bit old PE executable were observed over time. as well It uses an Elliptic Curve Algorithm (Montgomery Algorithm) to build the encryption keys. | No Attribution |
| Name | Description | Attribution | Blogpost URLs | Link |
|---|---|---|---|---|
| STOP, Djvu | STOP Djvu Ransomware it is a ransomware which encrypts user data through AES-256 and adds one of the dozen available extensions as marker to the encrypted file's name. It is not used to encrypt the entire file but only the first 5 MB. In its original version it was able to run offline and, in that case, it used a hard-coded key which could be extracted to decrypt files. | No Attribution |
{"Download URLs": ["http://sdfjhuz.com/dl/build2.exe", "http://cajgtus.com/files/1/build3.exe"], "C2 url": "http://cajgtus.com/test2/get.php", "Ransom note file": "_README.txt", "Ransom note": "ATTENTION!\r\n\r\nDon't worry, you can return all your files!\r\nAll your files like pictures, databases, documents and other important are encrypted with strongest encryption and unique key.\r\nThe only method of recovering files is to purchase decrypt tool and unique key for you.\r\nThis software will decrypt all your encrypted files.\r\nWhat guarantees you have?\r\nYou can send one of your encrypted file from your PC and we decrypt it for free.\r\nBut we can decrypt only 1 file for free. File must not contain valuable information.\r\nDo not ask assistants from youtube and recovery data sites for help in recovering your data.\r\nThey can use your free decryption quota and scam you.\r\nOur contact is emails in this text document only.\r\nYou can get and look video overview decrypt tool:\r\nhttps://wetransfer.com/downloads/54cdfd152fe98eedb628a1f4ddb7076420240421150208/403a27\r\nPrice of private key and decrypt software is $999.\r\nDiscount 50% available if you contact us first 72 hours, that's price for you is $499.\r\nPlease note that you'll never restore your data without payment.\r\nCheck your e-mail \"Spam\" or \"Junk\" folder if you don't get answer more than 6 hours.\r\n\r\n\r\nTo get this software you need write on our e-mail:\r\nsupport@freshingmail.top\r\n\r\nReserve e-mail address to contact us:\r\ndatarestorehelpyou@airmail.cc\r\n\r\nYour personal ID:\r\n0864PsawqS", "Ignore Files": ["ntuser.dat", "ntuser.dat.LOG1", "ntuser.dat.LOG2", "ntuser.pol", ".sys", ".ini", ".DLL", ".dll", ".blf", ".bat", ".lnk", ".regtrans-ms", "C:\\SystemID\\", "C:\\Users\\Default User\\", "C:\\Users\\Public\\", "C:\\Users\\All Users\\", "C:\\Users\\Default\\", "C:\\Documents and Settings\\", "C:\\ProgramData\\", "C:\\Recovery\\", "C:\\System Volume Information\\", "C:\\Users\\%username%\\AppData\\Roaming\\", "C:\\Users\\%username%\\AppData\\Local\\", "C:\\Windows\\", "C:\\PerfLogs\\", "C:\\ProgramData\\Microsoft\\", "C:\\ProgramData\\Package Cache\\", "C:\\Users\\Public\\", "C:\\$Recycle.Bin\\", "C:\\$WINDOWS.~BT\\", "C:\\dell\\", "C:\\Intel\\", "C:\\MSOCache\\", "C:\\Program Files\\", "C:\\Program Files (x86)\\", "C:\\Games\\", "C:\\Windows.old\\", "D:\\Users\\%username%\\AppData\\Roaming\\", "D:\\Users\\%username%\\AppData\\Local\\", "D:\\Windows\\", "D:\\PerfLogs\\", "D:\\ProgramData\\Desktop\\", "D:\\ProgramData\\Microsoft\\", "D:\\ProgramData\\Package Cache\\", "D:\\Users\\Public\\", "D:\\$Recycle.Bin\\", "D:\\$WINDOWS.~BT\\", "D:\\dell\\", "D:\\Intel\\", "D:\\MSOCache\\", "D:\\Program Files\\", "D:\\Program Files (x86)\\", "D:\\Games\\", "E:\\Users\\%username%\\AppData\\Roaming\\", "E:\\Users\\%username%\\AppData\\Local\\", "E:\\Windows\\", "E:\\PerfLogs\\", "E:\\ProgramData\\Desktop\\", "E:\\ProgramData\\Microsoft\\", "E:\\ProgramData\\Package Cache\\", "E:\\Users\\Public\\", "E:\\$Recycle.Bin\\", "E:\\$WINDOWS.~BT\\", "E:\\dell\\", "E:\\Intel\\", "E:\\MSOCache\\", "E:\\Program Files\\", "E:\\Program Files (x86)\\", "E:\\Games\\", "F:\\Users\\%username%\\AppData\\Roaming\\", "F:\\Users\\%username%\\AppData\\Local\\", "F:\\Windows\\", "F:\\PerfLogs\\", "F:\\ProgramData\\Desktop\\", "F:\\ProgramData\\Microsoft\\", "F:\\Users\\Public\\", "F:\\$Recycle.Bin\\", "F:\\$WINDOWS.~BT\\", "F:\\dell\\", "F:\\Intel\\"], "Public Key": "-----BEGIN PUBLIC KEY-----\\\\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAw0Ftq9GtunuzQZHGiqoG\\\\n8S4cMO\\/Bdgsd+jTtFbVs1bX4OXiYKnMXg4LclKMEHJ2gnP2X09BkzA29UJQlagak\\\\nuAL7j7iRagKeU4tAB8w9rziBYoa9zROqer7J6pf5B11vAvvRq4b3127kAxnMhpgo\\\\ns7MQC7pXIvTkEeGySeG+F5fjSMPUoF1\\/cAg6GuSWOPXoPvXKRA\\/mo+xyHVOKZe2+\\\\nSCpbMHAyMe7o4w\\/i\\/pVjv9g8pRDJtz14qtMuAR38ek+SPJ4PJCxA9e0tOi+p4yNn\\\\nvnFKoL5OwzoF+bvVHnTA7tk4fXB3AyaL9llS0kxEWS7x\\/kNYQyJPh9fimryM03Cy\\\\n1wIDAQAB\\\\n-----END PUBLIC KEY-----"}| Source | Rule | Description | Author | Strings |
|---|---|---|---|---|
| JoeSecurity_Djvu | Yara detected Djvu Ransomware | Joe Security | ||
| Windows_Ransomware_Stop_1e8d48ff | unknown | unknown |
| |
| MALWARE_Win_STOP | Detects STOP ransomware | ditekSHen |
| |
| Windows_Trojan_RedLineStealer_ed346e4c | unknown | unknown |
| |
| JoeSecurity_Djvu | Yara detected Djvu Ransomware | Joe Security | ||
| Click to see the 46 entries | ||||
| Source | Rule | Description | Author | Strings |
|---|---|---|---|---|
| JoeSecurity_Djvu | Yara detected Djvu Ransomware | Joe Security | ||
| Windows_Ransomware_Stop_1e8d48ff | unknown | unknown |
| |
| MALWARE_Win_STOP | Detects STOP ransomware | ditekSHen |
| |
| JoeSecurity_Djvu | Yara detected Djvu Ransomware | Joe Security | ||
| Windows_Ransomware_Stop_1e8d48ff | unknown | unknown |
| |
| Click to see the 55 entries | ||||
System Summary |   |
|---|
| Source: | Author: Victor Sergeev, Daniil Yugoslavskiy, Gleb Sukhodolskiy, Timur Zinniatullin, oscd.community, Tim Shelton, frack113 (split): | ||
| Timestamp: | 04/24/24-15:57:00.032327 |
| SID: | 2833438 |
| Source Port: | 49707 |
| Destination Port: | 80 |
| Protocol: | TCP |
| Classtype: | A Network Trojan was detected |
| Timestamp: | 04/24/24-15:57:01.094676 |
| SID: | 2036335 |
| Source Port: | 80 |
| Destination Port: | 49707 |
| Protocol: | TCP |
| Classtype: | A Network Trojan was detected |
Click to jump to signature section
Show All Signature Results
AV Detection | |
|---|
| Source: | Avira: | ||
| Source: | Avira: | ||
| Source: | Malware Configuration Extractor: | ||