Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 834fc611a4d1d1cf…

MALICIOUS

Office (OLE)

941.5 KB Created: 2019-08-30 09:14:50 Authoring application: Microsoft Excel
MD5: cec6079cadd7aee571402ea28908ef12 SHA-1: df7afb2481ac82722c24790a8c0f3f51dbff540f SHA-256: 834fc611a4d1d1cf31fc0db182eef0aebfa648541042b9c6ede6d1e6d85c37d8
402 Risk Score

Malware Insights

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

The file contains VBA macros that utilize the Shell() function, indicating an attempt to execute external code. Critical heuristics confirm the presence of an embedded PE executable and a Shell() call within the VBA. The ClamAV detection further supports its malicious nature as a dropper. The VBA script likely facilitates the download and execution of the embedded executable.

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
c646e7795ff443df76eab7c1b9bd621d9197ca96f4eeba13a3b1f812ee9701e2		 embedded-pe Office MZ+PE at offset 0x44F1 946447 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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