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

Static analysis result for SHA-256 4df6b7cd5398387a…

MALICIOUS

Office (OLE) / .XLS

918.5 KB Created: 2020-06-22 10:41:03 Authoring application: Microsoft Excel
MD5: fdfa678581b990c3e05e72c85d11f612 SHA-1: 010d2161451e9979b4b67c439f5789d73e78dc79 SHA-256: 4df6b7cd5398387adb2bf5f1b63c9f7f8f0f5e1ed1c4a748a5159bcec0ecadde
520 Risk Score

Malware Insights

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

The file is an XLS document containing VBA macros, specifically a Workbook_Open macro that utilizes Shell() to execute an embedded PE executable. This indicates a dropper functionality, where the macro is used to launch a secondary malicious payload. The presence of VirtualAlloc, LoadLibrary, and GetProcAddress API calls further suggests the execution of shellcode or dynamic loading of malicious code. ClamAV detection as Win.Dropper.Hideproc-6663113-0 confirms the malicious nature and dropper behavior.

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
e4484270eddd470d92b0a0c42cc523e64a7056ea68b59aa12626ba67c5a2192c		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 10605 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_00006265.exe
1ca0821bfe4bd2f8db1da6947fa70669b44aec1c6fe6d971f332857249f54680		 embedded-pe Office MZ+PE at offset 0x6265 915355 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
ba380a9ac8cf9a519b12e971637580f741b28f08dd1f181175cc5c3d1545153c		 ole-package OLE Ole10Native stream: MBD005A12B8/Ole10Native 610471 bytes

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