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

Static analysis result for SHA-256 bc4ebaeff64eba8c…

MALICIOUS

Office (OLE) / .XLS

925.0 KB Created: 2020-06-22 10:41:03 Authoring application: Microsoft Excel
MD5: d76223ddc5ab5748240bf72973878a4d SHA-1: 33a1c8d283956e67f4954f4f51dc785c22c71250 SHA-256: bc4ebaeff64eba8ccdf9b3f75845faf28339274b616adb06cd2e2bad8a3ebf18
560 Risk Score

Malware Insights

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

This XLS file contains a Workbook_Open VBA macro that utilizes the Shell() function to execute an embedded PE executable. The presence of VirtualAlloc, LoadLibrary, and GetProcAddress API calls, along with the detection of an embedded PE executable and a ClamAV signature of Win.Dropper.Hideproc-6663113-0, strongly indicates a dropper functionality. The macro's auto-execution and the embedded executable are the primary indicators of malicious intent.

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
e51e1f973f97e59e91d6268a4de2e46a1e8c0f16c042ba769827d6a15190b3aa		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 30989 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
1c1ba754e6ed3534d3860c321383b85d6c6a13111d89a6d8930344a96b28942b		 embedded-pe Office MZ+PE at offset 0x6265 922011 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
938a226a0cea765197773a07c303387cd806465ddb346b3850b96578c79ac5f3		 ole-package OLE Ole10Native stream: MBD006D6CCC/Ole10Native 614055 bytes

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