Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 c631f17cdbd835d2…

MALICIOUS

Office (OLE) / .XLS

151.5 KB Created: 2020-12-08 13:54:04 Authoring application: Microsoft Excel
MD5: d7b206b42917085845da209d050e48d0 SHA-1: 24753f116570cd2b25801e133320a2a6e1ae4162 SHA-256: c631f17cdbd835d2805b3c181debf4b31690d5c678c572e6b0970d26d850400e
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic

The file contains VBA macros, specifically a Workbook_Open macro that executes a Shell() command. This command appears to be a heavily obfuscated PowerShell script. The script's intent is to download and execute a second-stage payload, as indicated by the use of Shell() and the obfuscated PowerShell code. The presence of the 'macros.bas' artifact further supports this analysis.

Heuristics 5

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
411cba64248cef38ddb4f93a60fb572a19dafd9cefcf294de72191a314de7bdb		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2159 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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