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

Static analysis result for SHA-256 6dca133510d56069…

MALICIOUS

Office (OLE) / .XLS

821.0 KB Created: 2019-08-30 09:14:50 Authoring application: Microsoft Excel
MD5: e047346f0feebf9bfb474aca3bd6c4d8 SHA-1: 3ea71a074226683b557bc8f1be2905f0bca016e5 SHA-256: 6dca133510d560694570afc730dd31ac54a2651884f95b2ac0263dcb0b8ea692
402 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File

The sample is an Excel file containing VBA macros that leverage Windows Script Host and API calls like VirtualAlloc and LoadLibrary. Crucially, it embeds a PE executable and uses the Shell() function, indicating it's designed to drop and run a secondary payload. The embedded PE was detected by ClamAV as Win.Dropper.Hideproc-6663113-0, confirming its malicious nature.

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
56be25cbb6875a49ad962ac7fa31f271de6c58edf73c655f0e6ec6ff2847baa8		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 14372 bytes
embedded_office_000044f1.exe
42040a752bc1ce3f385908d10e3d9a518cf7dc3a881d77f8b29332c3522a801a		 embedded-pe Office MZ+PE at offset 0x44F1 823055 bytes
Detection
ClamAV: Win.Dropper.Hideproc-6663113-0
Obfuscation or payload: unlikely
ole10native_00.bin
19b52f1add3d684446fd404d2b90f24697030288cf5c2c5ba0e06da52f179e3d		 ole-package OLE Ole10Native stream: MBD0090C244/Ole10Native 614941 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.