Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 395ebad9dce58a54…

MALICIOUS

Office (OLE)

332.5 KB Created: 2020-07-13 11:03:58 Authoring application: Microsoft Excel First seen: 2020-09-07
MD5: dcea304495cf7616a1598dfc9f4fc0b8 SHA-1: a77dc13773843b8ff9e91977ec4a2c7c5e17b607 SHA-256: 395ebad9dce58a546039d77911f86c274d7c0dc1869bd4eeb78d38133e9fee21
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET and OLE_XLM_AUTOOPEN heuristics. ClamAV also detected it as Xls.Dropper.Agent. The presence of encrypted XLM macros suggests an attempt to download and execute a secondary payload, a common technique for initial access or further system compromise.

Heuristics 3

  • ClamAV: Xls.Dropper.Agent-9608385-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-9608385-0
  • Encrypted Excel 4.0 macro sheet high OLE_XLM_ENCRYPTED_MACROSHEET
    Workbook contains an Excel 4.0 macro sheet and BIFF FILEPASS encryption. Password-protected XLM macro sheets, especially the default Excel password path, are a common malware evasion pattern because static formula extraction may fail until the workbook is decrypted.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

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