Win.Dropper.Hideproc-6663113-0 — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 02ec074f0269a8c8…

MALICIOUS

Office (OLE) / .XLS

813.0 KB Created: 2020-06-22 10:41:03 Authoring application: Microsoft Excel
MD5: bb921af7b9c502c207b6f40fa9937cb7 SHA-1: c205c932952bfa8acfee0f4fb8aee0d0d27608e1 SHA-256: 02ec074f0269a8c818c9c7909b0a199ef6eda4e345e2b1517d09244fe4ab7dd9
522 Risk Score

Malware Insights

Win.Dropper.Hideproc-6663113-0 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1106 Native API T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is an Excel file containing a Workbook_Open VBA macro that triggers the execution of an embedded PE executable. This behavior is indicative of a dropper, designed to download and execute a second-stage payload. The embedded executable was identified by ClamAV as Win.Dropper.Hideproc-6663113-0.

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/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://ns.adobe.com/xap/1.0/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
472d8ff785cf9e5492bcf132216e27bdb548d574bcf6229354cc29f5523364f0		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 11045 bytes
embedded_office_00001b5d.exe
b26dc9ba3a26c29f0db9eb682f39f7991345d66dad47acf56481f0be202c14af		 embedded-pe Office MZ+PE at offset 0x1B5D 825507 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
e26f47a921172248b76f43b98d59ab1f6f75ba0c4f0a4e6677377a856976054f		 ole-package OLE Ole10Native stream: MBD00F110EA/Ole10Native 587709 bytes

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