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

Static analysis result for SHA-256 7bcd11a1ff9e4b2e…

MALICIOUS

Office (OLE) / .XLS

789.0 KB Created: 2019-08-30 09:14:50 Authoring application: Microsoft Excel
MD5: 00e5dc3531190717d8077af07700b465 SHA-1: e92560142a4f518c5a84db145b9c10c283e38dca SHA-256: 7bcd11a1ff9e4b2ed8ae2049899967492922aa67531471f2a0000c56d8300d0b
482 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File T1027 Obfuscated Files or Information

The sample is an Excel file containing both Excel 4.0 (XLM) macros and VBA code. Heuristics indicate the presence of Auto_Open macros, Shell() calls, and references to Windows API functions like VirtualAlloc, LoadLibrary, and GetProcAddress, suggesting the execution of malicious code. An embedded PE executable was also extracted, likely serving as a second-stage payload. The ClamAV detection further confirms its malicious nature as a dropper.

Heuristics 12

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • 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
b36ffeebe5662daf92fbec459fa433677c95bce6111962aef91f5314cbd2099b		 embedded-pe Office MZ+PE at offset 0x6065 783259 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

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