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Windows Analysis Report 3nkW4MtwSD
Overview
General Information
| Sample Name: | 3nkW4MtwSD (renamed file extension from none to rtf) |
| Analysis ID: | 528701 |
| MD5: | 5aad2b6635b3069402aaf6ff389bea64 |
| SHA1: | a8617ddffd6c934fcf3f64c6e84b1a23ffa9d092 |
| SHA256: | 718dcc870c0de487595feed4e5e43dc70fba6fa2aaac15462c0ba5c20028e7bd |
| Tags: | rtf |
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Most interesting Screenshot:  |
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Detection
FormBook
| Score: | 100 |
| Range: | 0 - 100 |
| Whitelisted: | false |
| Confidence: | 100% |
Signatures
Found malware configuration
Sigma detected: EQNEDT32.EXE connecting to internet
Multi AV Scanner detection for submitted file
Yara detected FormBook
Malicious sample detected (through community Yara rule)
Yara detected AntiVM3
Antivirus / Scanner detection for submitted sample
Sigma detected: Droppers Exploiting CVE-2017-11882
System process connects to network (likely due to code injection or exploit)
Sigma detected: File Dropped By EQNEDT32EXE
Antivirus detection for dropped file
Sample uses process hollowing technique
Maps a DLL or memory area into another process
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802)
Modifies the prolog of user mode functions (user mode inline hooks)
.NET source code contains potential unpacker
Injects a PE file into a foreign processes
Sigma detected: Execution from Suspicious Folder
Office equation editor drops PE file
Queues an APC in another process (thread injection)
Tries to detect virtualization through RDTSC time measurements
Modifies the context of a thread in another process (thread injection)
C2 URLs / IPs found in malware configuration
Drops PE files to the user root directory
Queries the volume information (name, serial number etc) of a device
Yara signature match
Antivirus or Machine Learning detection for unpacked file
May sleep (evasive loops) to hinder dynamic analysis
Uses code obfuscation techniques (call, push, ret)
Internet Provider seen in connection with other malware
Detected potential crypto function
Found potential string decryption / allocating functions
Sample execution stops while process was sleeping (likely an evasion)
Contains functionality to call native functions
Potential document exploit detected (performs DNS queries)
HTTP GET or POST without a user agent
PE file contains executable resources (Code or Archives)
IP address seen in connection with other malware
Downloads executable code via HTTP
Contains functionality for execution timing, often used to detect debuggers
Document misses a certain OLE stream usually present in this Microsoft Office document type
Contains long sleeps (>= 3 min)
Enables debug privileges
Found inlined nop instructions (likely shell or obfuscated code)
Potential document exploit detected (unknown TCP traffic)
Drops PE files
Contains functionality to read the PEB
Uses a known web browser user agent for HTTP communication
Office Equation Editor has been started
Checks if the current process is being debugged
Drops PE files to the user directory
Potential document exploit detected (performs HTTP gets)
Allocates memory within range which is reserved for system DLLs (kernel32.dll, advapi32.dll, etc)
Creates a process in suspended mode (likely to inject code)
Contains functionality to access loader functionality (e.g. LdrGetProcedureAddress)
Classification
AV Detection: |
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| Found malware configuration |
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| Multi AV Scanner detection for submitted file |
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| Yara detected FormBook |
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| Antivirus / Scanner detection for submitted sample |
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| Antivirus detection for dropped file |
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| Antivirus or Machine Learning detection for unpacked file |
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| Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802) |
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| Office Equation Editor has been started |
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Software Vulnerabilities: |
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| Potential document exploit detected (performs DNS queries) |
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| Found inlined nop instructions (likely shell or obfuscated code) |
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Code function: |
4_2_00407B1A | |
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4_2_0040E460 | |
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6_2_000CE460 | |
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6_2_000C7B1B | |
| Potential document exploit detected (unknown TCP traffic) |
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| Potential document exploit detected (performs HTTP gets) |
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| System process connects to network (likely due to code injection or exploit) |
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| C2 URLs / IPs found in malware configuration |
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| Internet Provider seen in connection with other malware |
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| HTTP GET or POST without a user agent |
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| IP address seen in connection with other malware |
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| Downloads executable code via HTTP |
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