Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d9e871e6768a9e56…

MALICIOUS

Office (OLE)

811.5 KB Created: 2019-08-30 09:14:50 Authoring application: Microsoft Excel
MD5: c9cca6388008b8c5eb84740c39c0e31e SHA-1: ae523573155c18ea52fb3ffd18d77e59413450db SHA-256: d9e871e6768a9e56cdf2675ea6f74428b6d9dc90098999937ed8ad947cbe7034
400 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command and Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is an Office document containing VBA macros. Heuristics indicate the use of Shell(), VirtualAlloc, LoadLibrary, and GetProcAddress, suggesting the execution of code. The presence of an embedded PE executable and references to Windows Script Host strongly indicate that the macros are designed to download and execute a secondary payload. The single unknown reputation URL is included as a potential indicator.

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
7c732f7f8f982d5290050a8d1ba24dabcab5131c3c82b99cd0bb8424b5153fe5		 embedded-pe Office MZ+PE at offset 0x44F1 813327 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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