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

Static analysis result for SHA-256 d53d95201953cf7d…

MALICIOUS

Office (OLE) / .XLS

726.5 KB Created: 2019-08-30 09:14:50 Authoring application: Microsoft Excel
MD5: 11163a75ddf1bd1930a5ff59a685b0ef SHA-1: 5a34a6cecd025905989f51cb8e50a82293a827cb SHA-256: d53d95201953cf7d0ba8106b61bb7ec65db7408fdb694236410fa5a9628f6ee9
400 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1059.003 Windows Command Shell

The sample is an Excel file containing VBA macros. Heuristics indicate the use of Shell(), VirtualAlloc, LoadLibrary, and GetProcAddress, suggesting dynamic code execution and loading. A PE executable is embedded within the document, and ClamAV identifies the file as Win.Dropper.Hideproc-6663113-0. The embedded script likely downloads and executes a second-stage payload. The presence of an unknown reputation URL is noted 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
aafcaaf90595ab36360aa7ebea1d205f695ebaa4733d161e0344dd0c919faf50		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 14318 bytes
embedded_office_000044f1.exe
766b467b8b8f23d356fd4e22d2d6b87debac50943e9631b35ddfb1d505ac0386		 embedded-pe Office MZ+PE at offset 0x44F1 726287 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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