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

Static analysis result for SHA-256 ae8d1ee2e7d9d468…

MALICIOUS

Office (OLE) / .XLS

173.0 KB Created: 2020-03-17 07:35:56 Authoring application: Microsoft Excel
MD5: f306811f037af26cdd2425efce85af15 SHA-1: 42f8416ce6eca1e29c7e310ca20d79b0fc70506d SHA-256: ae8d1ee2e7d9d46818e3949e8b945c72a4f8bac4ae0c78778f8821647d9ac024
260 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file is identified as malicious by ClamAV as 'Xls.Dropper.Agent-7625759-0'. Static analysis revealed VBA macros, specifically a Workbook_Open auto-execution routine that utilizes the Shell() function. This indicates the macro is intended to download and execute a second-stage payload. The presence of a long encoded blob and VBA auto-execution with execution terms further supports this dropper functionality.

Heuristics 6

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Xls.Dropper.Agent-7625759-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7625759-0
  • 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
7a25c53685bd8603c1656311c27871f96cbe04bd6c429ea9c8a641122c126694		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 4042 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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