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Analysis Report Agency Appointment VSL Tbn-Port-Appointment Letter- 2100133.xlsx
Overview
General Information
| Sample Name: | Agency Appointment VSL Tbn-Port-Appointment Letter- 2100133.xlsx |
| Analysis ID: | 433035 |
| MD5: | 27211c2dc1809cc2ab4469ff246f9cb4 |
| SHA1: | 735918b9ed26c5eafa266305fcf677bd2ee5f0a2 |
| SHA256: | b4b855d04e706c33129c2db1c80d8b05497fa56a2288ef2fb4e631fe42aa781f |
| Tags: | VelvetSweatshopxlsx |
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Most interesting Screenshot:  |
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Detection
FormBook
| Score: | 100 |
| Range: | 0 - 100 |
| Whitelisted: | false |
| Confidence: | 100% |
Signatures
Detected unpacking (changes PE section rights)
Found malware configuration
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Sigma detected: Droppers Exploiting CVE-2017-11882
Sigma detected: File Dropped By EQNEDT32EXE
Snort IDS alert for network traffic (e.g. based on Emerging Threat rules)
System process connects to network (likely due to code injection or exploit)
Yara detected FormBook
C2 URLs / IPs found in malware configuration
Drops PE files to the user root directory
Machine Learning detection for dropped file
Maps a DLL or memory area into another process
Modifies the context of a thread in another process (thread injection)
Office equation editor drops PE file
Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802)
Queues an APC in another process (thread injection)
Sample uses process hollowing technique
Sigma detected: Execution from Suspicious Folder
Tries to detect virtualization through RDTSC time measurements
Allocates a big amount of memory (probably used for heap spraying)
Allocates memory within range which is reserved for system DLLs (kernel32.dll, advapi32.dll, etc)
Antivirus or Machine Learning detection for unpacked file
Checks if the current process is being debugged
Contains functionality for execution timing, often used to detect debuggers
Contains functionality for read data from the clipboard
Contains functionality to access loader functionality (e.g. LdrGetProcedureAddress)
Contains functionality to call native functions
Contains functionality to dynamically determine API calls
Contains functionality to read the PEB
Contains functionality to shutdown / reboot the system
Creates a process in suspended mode (likely to inject code)
Detected potential crypto function
Document misses a certain OLE stream usually present in this Microsoft Office document type
Downloads executable code via HTTP
Drops PE files
Drops PE files to the user directory
Enables debug privileges
Found inlined nop instructions (likely shell or obfuscated code)
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
May sleep (evasive loops) to hinder dynamic analysis
Office Equation Editor has been started
Potential document exploit detected (performs DNS queries)
Potential document exploit detected (performs HTTP gets)
Potential document exploit detected (unknown TCP traffic)
Sample execution stops while process was sleeping (likely an evasion)
Uses a known web browser user agent for HTTP communication
Uses code obfuscation techniques (call, push, ret)
Yara signature match
Classification
AV Detection: |
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| Found malware configuration |
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| Multi AV Scanner detection for dropped file |
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| Multi AV Scanner detection for submitted file |
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| Yara detected FormBook |
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| Machine Learning detection for dropped file |
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| Antivirus or Machine Learning detection for unpacked file |
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Exploits: |
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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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Code function: |
4_2_00405E61 | |
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4_2_0040548B | |
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Code function: |
4_2_0040263E | |
Software Vulnerabilities: |
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| Allocates a big amount of memory (probably used for heap spraying) |
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| Found inlined nop instructions (likely shell or obfuscated code) |
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Code function: |
5_2_00415851 | |
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5_2_00406A98 | |
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Code function: |
7_2_00095851 | |
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7_2_00086A99 | |
| Potential document exploit detected (performs DNS queries) |
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| Potential document exploit detected (performs HTTP gets) |
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| Potential document exploit detected (unknown TCP traffic) |
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| Snort IDS alert for network traffic (e.g. based on Emerging Threat rules) |
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| C2 URLs / IPs found in malware configuration |
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| Downloads executable code via HTTP |
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