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

Static analysis result for SHA-256 11bfb28b84f50a19…

MALICIOUS

Office (OLE) / .XLS

838.5 KB Created: 2020-06-22 10:41:03 Authoring application: Microsoft Excel
MD5: 07647605ff555d2eb03b730fbedc1f0d SHA-1: c7aaf9a11bc1a68a1dadb5b2a6a9082df15e7d95 SHA-256: 11bfb28b84f50a191a8c8c3d579f7c7129de6a6e5051f309ea6e3b4862d63724
562 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is an Excel file containing a Workbook_Open VBA macro that executes a Shell command. This macro is designed to launch an embedded PE executable, identified as Win.Dropper.Hideproc-6663113-0 by ClamAV. The embedded executable is the primary payload, and the VBA macro serves as the loader.

Heuristics 14

  • 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
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CallByName call high OLE_VBA_CALLBYNAME
    CallByName call
  • 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.
  • Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOC
    Reference to VirtualAlloc API
  • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
02b6f3e74cfa2e300b0810dab0ac71d041a496b8bf11b69d9f31d3147b50aab4		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 10774 bytes
embedded_office_00006265.exe
edf6db35978e2dfdaf9393dfd8b12561d9e68a358e841ff5531b78a59fd6ec28		 embedded-pe Office MZ+PE at offset 0x6265 833435 bytes
Detection
ClamAV: Win.Dropper.Hideproc-6663113-0
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
ole10native_00.bin
d4063524ac8b4c28e657e66470ff6c92d0788f94f13fb74052c628580ac401b8		 ole-package OLE Ole10Native stream: MBD0097F7A5/Ole10Native 612007 bytes

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