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

Static analysis result for SHA-256 d1e95df7803f4ccf…

MALICIOUS

Office (OLE) / .XLS

731.0 KB Created: 2019-08-30 09:14:50 Authoring application: Microsoft Excel
MD5: 1e70b858080be64e66e6e5b48d67b24d SHA-1: 7babf395966509a5e1ec2de7c63083a9ffa5dd64 SHA-256: d1e95df7803f4ccf8d49bfa987fc35c5ed89adc89820d8c06e4a1df5bd8e40f3
400 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059.003 Windows Command Shell T1059.001 PowerShell

The sample is an Excel file containing VBA macros. Critical heuristics indicate the presence of a Shell() call and an embedded PE executable. The macros reference Windows APIs such as VirtualAlloc, LoadLibrary, and GetProcAddress, suggesting dynamic code loading and execution. The embedded PE executable, detected by ClamAV as Win.Dropper.Hideproc-6663113-0, is likely the secondary payload. The presence of an unknown URL also warrants attention.

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
aafcaaf90595ab36360aa7ebea1d205f695ebaa4733d161e0344dd0c919faf50		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 14318 bytes
embedded_office_000044f1.exe
be5df4bf1cc2bb1f7e4c31a0f2ce8f6799c752930984441b109f990c21101480		 embedded-pe Office MZ+PE at offset 0x44F1 730895 bytes
Detection
ClamAV: Win.Dropper.Hideproc-6663113-0
Obfuscation or payload: unlikely
ole10native_00.bin
c64dcafa616038fea032c518953dfc75dfdce8774d27a2c205eadd410e71075a		 ole-package OLE Ole10Native stream: MBD0001C810/Ole10Native 611869 bytes

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