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

Static analysis result for SHA-256 265822c25e2c3101…

MALICIOUS

Office (OLE) / .XLS

818.5 KB Created: 2020-06-22 10:41:03 Authoring application: Microsoft Excel
MD5: f06bc26fde7e1f80172495ac3bf818d3 SHA-1: 31a9341ecf475c627102b15f2007708eda315400 SHA-256: 265822c25e2c31011700cfe14245e16d29fa4bfc509a8feed16f70a460f04d2f
520 Risk Score

Malware Insights

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

The sample is an Excel file containing a Workbook_Open macro that utilizes the Shell() function. This macro is designed to execute an embedded PE executable, identified as 'embedded_office_00001b53.exe'. The presence of VirtualAlloc, LoadLibrary, and GetProcAddress API calls within the macro code suggests dynamic loading of malicious code. ClamAV detection as 'Win.Dropper.Hideproc-6663113-0' further confirms its malicious nature as a dropper.

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
6d5848e5da2487303aa21be6e2bc29ebddbd8c24ae468ac63051e339648f1846		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 11007 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_00001b53.exe
ebc188d08b8e6c2e449ad4149c1813a2d1c24d64acd597ad4192df388d4d0380		 embedded-pe Office MZ+PE at offset 0x1B53 831149 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
b1fa392bb373223ddc3daa16b23f155332e3196967318068a95ad72d6d72c0a9		 ole-package OLE Ole10Native stream: MBD00D73BAE/Ole10Native 593311 bytes

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