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

Static analysis result for SHA-256 d9696165b5681b4a…

MALICIOUS

Office (OLE) / .DOC

275.0 KB Created: 2020-04-28 11:51:53 Authoring application: Microsoft Excel
MD5: a4d02613220ef3757c98ffccd469bf44 SHA-1: 5c6ae0f0f6ef9ce5f6b47004f6fed119f779043a SHA-256: d9696165b5681b4a7a31c7c78c089be3defd9045795df889ed7922cd6502c19c
320 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell T1059.003 Windows Command Shell T1059.004 Python

This Excel 4.0 macro-enabled document contains an Auto_Open macro that utilizes dangerous functions, including ShellExecute and URLDownloadToFile. ClamAV identifies the file as 'Xls.Dropper.Agent-7722067-0', indicating its function as a dropper. The presence of numerous hidden macro sheets and the use of Auto_Open strongly suggest the intent is to execute a malicious payload.

Heuristics 7

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • ClamAV: Xls.Dropper.Agent-7722067-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7722067-0
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • OLE metadata lists many Excel 4.0 macro sheets medium OLE_XLM_DOCPROPS_MACROSHEET_INVENTORY
    Workbook contains a BIFF Excel 4.0 macro-sheet marker and its clear OLE DocumentSummaryInformation stream lists many MacroN sheet titles. This is a useful static signal when FILEPASS encryption prevents formula extraction from the workbook stream.
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
87b4d0e69b764444900f646df303d7098738e690a6afa99f8fe12e27ad1d4d84		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 61356 bytes

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