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

Static analysis result for SHA-256 dfaedaa006361064…

MALICIOUS

Office (OLE) / .XLS

733.5 KB Created: 2019-08-30 09:14:50 Authoring application: Microsoft Excel
MD5: 526219eb4e3ab1dd72d4baa517601798 SHA-1: a862e1639e69015f1b1d2b6802ccb0f117090db4 SHA-256: dfaedaa0063610648308e138d1f970068875ec5afe9f37e2f41748555d82bf97
400 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1059 Command and Scripting Interpreter

The sample is a malicious Excel file identified by ClamAV as Win.Dropper.Hideproc-6663113-0. It contains VBA macros that leverage the Shell() function, indicating an intent to execute external code. Furthermore, a PE executable is embedded within the document, and heuristics suggest the use of Windows Script Host and dynamic API loading (VirtualAlloc, LoadLibrary, GetProcAddress), typical of droppers designed to download and execute second-stage payloads. The embedded URL 'http://www.microsoft.com0' is suspicious and likely used for payload delivery.

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
6e0a0b5bf504c2040eb585ba27b179f6a43747bedf95daa855d6786e9f0407d1		 embedded-pe Office MZ+PE at offset 0x44F1 733455 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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