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

Static analysis result for SHA-256 b0f46bb10b7b5d39…

MALICIOUS

Office (OLE) / .XLS

904.0 KB Created: 2019-08-30 09:14:50 Authoring application: Microsoft Excel
MD5: 915ab7cfbc6b754138bdc7ecdea79c48 SHA-1: f8a029c771f41f42bf48226a01687fb98df0ec1e SHA-256: b0f46bb10b7b5d39a5dfbecf63235c4ee3c4538f6efc042506c3d4067a0b5f9c
420 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The sample is an Excel file containing both XLM and VBA macros. Critical heuristics indicate the presence of a VBA Shell() call and an embedded PE executable. The VBA macros likely leverage the Shell() function to download and execute the embedded PE file, which is detected by ClamAV as Win.Dropper.Hideproc-6663113-0. The presence of VirtualAlloc, LoadLibrary, and GetProcAddress APIs further suggests dynamic code loading and execution.

Heuristics 11

  • 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
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
  • 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.w3.org/2000/svg
    • http://www.w3.org/1999/xlink

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
5162791027cb7f91c31f988b99f357ec35b80778e7299491103255989efad2f0		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 920 bytes
macros.bas
6507bc56d080955299ae1dd7816960f5b571e5eed059fbf42b60ef9f0f4eba53		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 10360 bytes
embedded_office_00006065.exe
38acac7ebe22047ca8b4bb282aea077c99451f42b65d8b748dc06ca40566636b		 embedded-pe Office MZ+PE at offset 0x6065 901019 bytes
Detection
ClamAV: Win.Dropper.Hideproc-6663113-0
Obfuscation or payload: unlikely
ole10native_00.bin
5e4a254580e38d14ede1ba7d273702afc2e6c26c45c131c6e4aa3ac601027cb1		 ole-package OLE Ole10Native stream: MBD002CEAA2/Ole10Native 573607 bytes

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