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Windows
Analysis Report
MdeeRbWvqe.exe
Overview
General Information
| Sample name: | MdeeRbWvqe.exerenamed because original name is a hash value |
| Original sample name: | 817d3b2845b7869b9fc71086755bef75.exe |
| Analysis ID: | 1427102 |
| MD5: | 817d3b2845b7869b9fc71086755bef75 |
| SHA1: | 62afe642e08e778593a54c053af79cb2efecbe6b |
| SHA256: | 8a2abd6e386df2a7e44e4bfa90a327b92eccdf343341ef7a984b3b2bd796c1fa |
| Tags: | AsyncRATexeRAT |
| Infos: |   |
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Detection
LummaC, Babuk, Djvu, LummaC Stealer, RedLine, SmokeLoader
| Score: | 100 |
| Range: | 0 - 100 |
| Whitelisted: | false |
| Confidence: | 100% |
Signatures
Antivirus / Scanner detection for submitted sample
Antivirus detection for dropped file
Benign windows process drops PE files
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
Multi AV Scanner detection for submitted file
Snort IDS alert for network traffic
System process connects to network (likely due to code injection or exploit)
Yara detected Babuk Ransomware
Yara detected Djvu Ransomware
Yara detected LummaC Stealer
Yara detected RedLine Stealer
Yara detected SmokeLoader
Adds a directory exclusion to Windows Defender
Allocates memory in foreign processes
C2 URLs / IPs found in malware configuration
Checks for kernel code integrity (NtQuerySystemInformation(CodeIntegrityInformation))
Checks if the current machine is a virtual machine (disk enumeration)
Contains functionality to inject code into remote processes
Creates a thread in another existing process (thread injection)
Deletes itself after installation
Detected VMProtect packer
Found direct / indirect Syscall (likely to bypass EDR)
Found many strings related to Crypto-Wallets (likely being stolen)
Hides that the sample has been downloaded from the Internet (zone.identifier)
Hides threads from debuggers
High number of junk calls founds (likely related to sandbox DOS / API hammering)
Injects a PE file into a foreign processes
Loading BitLocker PowerShell Module
LummaC encrypted strings found
Machine Learning detection for dropped file
Machine Learning detection for sample
Maps a DLL or memory area into another process
Modifies existing user documents (likely ransomware behavior)
Modifies the hosts file
Overwrites code with unconditional jumps - possibly settings hooks in foreign process
PE file contains section with special chars
Queries sensitive disk information (via WMI, Win32_DiskDrive, often done to detect virtual machines)
Queries sensitive video device information (via WMI, Win32_VideoController, often done to detect virtual machines)
Query firmware table information (likely to detect VMs)
Sigma detected: Powershell Base64 Encoded MpPreference Cmdlet
Sigma detected: Suspicious Script Execution From Temp Folder
Suspicious powershell command line found
Tries to detect process monitoring tools (Task Manager, Process Explorer etc.)
Tries to detect sandboxes / dynamic malware analysis system (registry check)
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Tries to detect sandboxes and other dynamic analysis tools (window names)
Tries to detect virtualization through RDTSC time measurements
Tries to harvest and steal browser information (history, passwords, etc)
Tries to steal Crypto Currency Wallets
Uses cmd line tools excessively to alter registry or file data
Writes a notice file (html or txt) to demand a ransom
Writes to foreign memory regions
AV process strings found (often used to terminate AV products)
Allocates memory with a write watch (potentially for evading sandboxes)
Checks if Antivirus/Antispyware/Firewall program is installed (via WMI)
Checks if the current process is being debugged
Contains capabilities to detect virtual machines
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)
Contains long sleeps (>= 3 min)
Creates a process in suspended mode (likely to inject code)
Creates files inside the system directory
Detected TCP or UDP traffic on non-standard ports
Detected potential crypto function
Downloads executable code via HTTP
Drops PE files
Drops PE files to the application program directory (C:\ProgramData)
Drops certificate files (DER)
Drops files with a non-matching file extension (content does not match file extension)
Enables debug privileges
Entry point lies outside standard sections
Extensive use of GetProcAddress (often used to hide API calls)
Found a high number of Window / User specific system calls (may be a loop to detect user behavior)
Found evasive API chain (may stop execution after checking a module file name)
Found potential string decryption / allocating functions
HTTP GET or POST without a user agent
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
May sleep (evasive loops) to hinder dynamic analysis
One or more processes crash
PE file contains more sections than normal
PE file contains sections with non-standard names
Queries disk information (often used to detect virtual machines)
Queries sensitive processor information (via WMI, Win32_Processor, often done to detect virtual machines)
Queries the volume information (name, serial number etc) of a device
Sample execution stops while process was sleeping (likely an evasion)
Searches for user specific document files
Sigma detected: CurrentVersion Autorun Keys Modification
Sigma detected: Execution of Suspicious File Type Extension
Sigma detected: Powershell Defender Exclusion
Uses 32bit PE files
Uses Microsoft's Enhanced Cryptographic Provider
Uses a known web browser user agent for HTTP communication
Uses cacls to modify the permissions of files
Uses code obfuscation techniques (call, push, ret)
Uses reg.exe to modify the Windows registry
Yara detected Credential Stealer
Yara signature match
Classification
| Name | Description | Attribution | Blogpost URLs | Link |
|---|---|---|---|---|
| Lumma Stealer, LummaC2 Stealer | Lumma Stealer (aka LummaC2 Stealer) is an information stealer written in C language that has been available through a Malware-as-a-Service (MaaS) model on Russian-speaking forums since at least August 2022. It is believed to have been developed by the threat actor "Shamel", who goes by the alias "Lumma". Lumma Stealer primarily targets cryptocurrency wallets and two-factor authentication (2FA) browser extensions, before ultimately stealing sensitive information from the victim's machine. Once the targeted data is obtained, it is exfiltrated to a C2 server via HTTP POST requests using the user agent "TeslaBrowser/5.5"." The stealer also features a non-resident loader that is capable of delivering additional payloads via EXE, DLL, and PowerShell. | No Attribution |
|
| 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 |
|
| Name | Description | Attribution | Blogpost URLs | Link |
|---|---|---|---|---|
| RedLine Stealer | RedLine Stealer is a malware available on underground forums for sale apparently as standalone ($100/$150 depending on the version) or also on a subscription basis ($100/month). This malware harvests information from browsers such as saved credentials, autocomplete data, and credit card information. A system inventory is also taken when running on a target machine, to include details such as the username, location data, hardware configuration, and information regarding installed security software. More recent versions of RedLine added the ability to steal cryptocurrency. FTP and IM clients are also apparently targeted by this family, and this malware has the ability to upload and download files, execute commands, and periodically send back information about the infected computer. | No Attribution |
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| Name | Description | Attribution | Blogpost URLs | Link |
|---|---|---|---|---|
| SmokeLoader | The SmokeLoader family is a generic backdoor with a range of capabilities which depend on the modules included in any given build of the malware. The malware is delivered in a variety of ways and is broadly associated with criminal activity. The malware frequently tries to hide its C2 activity by generating requests to legitimate sites such as microsoft.com, bing.com, adobe.com, and others. Typically the actual Download returns an HTTP 404 but still contains data in the Response Body. |
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