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

Static analysis result for SHA-256 fbb9b316dff831c7…

MALICIOUS

Office (OLE) / .XLS

760.0 KB Created: 2020-06-22 10:41:03 Authoring application: Microsoft Excel
MD5: 03d4378e4dd718507a9c060b4604652d SHA-1: b24a98af44cebdd6eccc2ad1f1d96cc59ed9c2b6 SHA-256: fbb9b316dff831c77b1677ce9649461e1726d05f6ca6f8f6878eaff8bda0944c
520 Risk Score

Malware Insights

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

The sample is an Excel file containing VBA macros, specifically a Workbook_Open macro that utilizes Shell() to execute an embedded PE executable. This executable is detected by ClamAV as Win.Dropper.Hideproc-6663113-0. The presence of VirtualAlloc, LoadLibrary, and GetProcAddress API calls in the VBA code suggests the macro is preparing to load and execute the embedded payload. The primary intent is to download and execute a second-stage payload.

Heuristics 13

  • 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
  • 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
58cd04fb4d5773725e573807cc1dcf460d66b812d50a925c11f3dfa6a657c028		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 10584 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
embedded_office_00005c65.exe
1f035a802d7a889dc9b5f260ff4b3b2cc8942768f25bffc9a072bb45eb7fa132		 embedded-pe Office MZ+PE at offset 0x5C65 754587 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
968ce039cd0aa31e7cad6058649c91cc72868753f2bc4127f7eba88f075eb20f		 ole-package OLE Ole10Native stream: MBD0048EDF4/Ole10Native 575143 bytes

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