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

Static analysis result for SHA-256 1fd26cfe8e60d7e3…

MALICIOUS

Office (OLE) / .XLS

901.5 KB Created: 2019-08-30 09:14:50 Authoring application: Microsoft Excel
MD5: fbc81a3b9d5ac64f8255e7212bbef7f8 SHA-1: 51a8edb9c69dff235cbaf460289e99f512cfea97 SHA-256: 1fd26cfe8e60d7e3ad70b497dae8dfde0bade959cc45c238671d5490b260fd27
420 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1105 Ingress Tool Transfer T1059.003 Windows Command Shell

The sample contains both Excel 4.0 (XLM) and VBA macros, with a critical heuristic firing for a Shell() call. It also embeds a PE executable, identified by ClamAV as Win.Dropper.Hideproc-6663113-0. The presence of VirtualAlloc, LoadLibrary, and GetProcAddress API references suggests the embedded executable is likely a loader or dropper for further malicious activity. The document body content is truncated and does not provide further context on the lure.

Heuristics 11

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Embedded PE executable critical OLE_EMBEDDED_EXE
    MZ/PE header found inside document — possible embedded executable
  • ClamAV: Win.Dropper.Hideproc-6663113-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Dropper.Hideproc-6663113-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Reference to LoadLibrary API high SC_STR_LOADLIBRARY
    Reference to LoadLibrary API
  • Reference to GetProcAddress API high SC_STR_GETPROCADDRESS
    Reference to GetProcAddress API
  • Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOC
    Reference to VirtualAlloc API
  • 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.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/2000/svg
    • http://www.w3.org/1999/xlink

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
1bc979e37c7140bf97fd553514464221cf55783e65c32beb68992dced8c2c5f0		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1094 bytes
macros.bas
6507bc56d080955299ae1dd7816960f5b571e5eed059fbf42b60ef9f0f4eba53		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 10360 bytes
embedded_office_00006065.exe
948bce973066e47048498d306828a4bf0a79a57184799eadc1a32d1027551af2		 embedded-pe Office MZ+PE at offset 0x6065 898459 bytes
Detection
ClamAV: Win.Dropper.Hideproc-6663113-0
Obfuscation or payload: unlikely
ole10native_00.bin
5e4a254580e38d14ede1ba7d273702afc2e6c26c45c131c6e4aa3ac601027cb1		 ole-package OLE Ole10Native stream: MBD002CEAA2/Ole10Native 573607 bytes

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