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

Static analysis result for SHA-256 941258b651610051…

MALICIOUS

Office (OLE) / .XLS

733.0 KB Created: 2019-08-30 09:14:50 Authoring application: Microsoft Excel
MD5: 7c6c038a10e15a52271d739ad4e96d1b SHA-1: 2df843c5adb75eff92d33cbece64c8d4de2cc63e SHA-256: 941258b65161005128f1ac2f7de594221fb5d46fbdce6a774c32773f2fe289e1
400 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command and Shell T1105 Ingress Tool Transfer T1027 Obfuscated Files or Information

The sample is an XLS file containing VBA macros. Critical heuristics indicate the presence of a Shell() call and an embedded PE executable, along with references to Windows Script Host, VirtualAlloc, LoadLibrary, and GetProcAddress. This suggests the macro is designed to download and execute a second-stage payload from the unknown URL http://www.microsoft.com0, which is likely a typo or obfuscation. The embedded PE executable is the likely payload. The ClamAV detection of 'Win.Dropper.Hideproc-6663113-0' further supports this assessment.

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
b2c8e396a197c2ad0c067e89d3c71ca702063ea7abf02cd02c0e30976f445185		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 14439 bytes
embedded_office_000044f1.exe
3c7629bf57c078ea734242b73841e278027b5f297fe49a3bc632015e35336e55		 embedded-pe Office MZ+PE at offset 0x44F1 732943 bytes
Detection
ClamAV: Win.Dropper.Hideproc-6663113-0
Obfuscation or payload: unlikely
ole10native_00.bin
7081e0ca139e9d7ad37954b30c9c4d40be4a8f7c2745ddb94966e08a83fa50cc		 ole-package OLE Ole10Native stream: MBD00704BCC/Ole10Native 622621 bytes

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