Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 124832627c3274c1…

MALICIOUS

Office (OLE)

742.0 KB Created: 2019-08-30 09:14:50 Authoring application: Microsoft Excel
MD5: 4ac11e40e49a0c2135ecbf95762a8444 SHA-1: 10f336ab01a935d6aa831a63ab58e545e4d6d792 SHA-256: 124832627c3274c138d06f3f52c66286a6bece9dce3a5b9ee03ba3e28ff6fc86
402 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File T1027 Obfuscated Files or Information

The sample is an Excel document containing VBA macros that leverage Windows Script Host and API calls like VirtualAlloc and LoadLibrary. Crucially, it embeds and extracts a PE executable, identified by ClamAV as Win.Dropper.Hideproc-6663113-0. The VBA script's primary function appears to be the execution of this embedded payload, likely to download and run further malicious content.

Heuristics 10

  • 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
  • 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.microsoft.com0
    • http://crl.microsoft.com/pki/crl/products/MicrosoftTimeStampPCA.crl0X
    • http://www.microsoft.com/pki/certs/MicrosoftTimeStampPCA.crt0
    • http://crl.microsoft.com/pki/crl/products/MicCodSigPCA_08-31-2010.crl0Z
    • http://www.microsoft.com/pki/certs/MicCodSigPCA_08-31-2010.crt0
    • http://crl.microsoft.com/pki/crl/products/microsoftrootcert.crl0T
    • http://www.microsoft.com/pki/certs/MicrosoftRootCert.crt0

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
888c70d21f83f913161586d9572083be4266d3106ae0f87526fc31f336071aa6		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 14358 bytes
embedded_office_000044f1.exe
5cdb9dcfde2c3148f68439d1c6f7d238a9d927d06885a967ce463f752e1d494b		 embedded-pe Office MZ+PE at offset 0x44F1 742159 bytes
Detection
ClamAV: Win.Dropper.Hideproc-6663113-0
Obfuscation or payload: unlikely
ole10native_00.bin
9dc5a0bfb900a50933edcd585ffcbc4bed2af044e653c6df90ad0229c5fd64db		 ole-package OLE Ole10Native stream: MBD00059305/Ole10Native 618013 bytes

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