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

Static analysis result for SHA-256 c199a5c25a123f18…

MALICIOUS

Office (OLE) / .XLS

426.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: b786200951a74f5363df9d2879803b41 SHA-1: 0d16904318cdf37e6e065d85c9472559389eaab1 SHA-256: c199a5c25a123f18552c1bcf2b69ef61835c8f25ea51251da2b9f0fe0efc275a
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell T1204 User Execution T1059 Command and Scripting Interpreter

The sample is an Excel 4.0 (XLM) macro sheet that also contains VBA macros. It utilizes a Workbook_Open macro and an Auto_Open XLM macro, both of which are designed to execute automatically when the document is opened. The presence of the SE_ENABLE_LURE heuristic indicates the document likely instructs the user to enable macros or editing to bypass security settings. The SC_STR_URLDOWNLOAD heuristic suggests the macro attempts to download a file from the internet, specifically from the URL http://enginotelfinike.com/19.gif, which is likely a second-stage payload. The SC_STR_SHELLEXEC heuristic indicates that a shell execute function is called, further supporting the payload execution.

Heuristics 8

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • XLM Auto_Open with dangerous formula APIs high OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://enginotelfinike.com/19.gif�
    • http://enginotelfinike.com/19.gif
    • http://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
e26e570691e37538cb153a294d4bd7899ebc79f39ec63fd34cf1eae37efa26f6		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 9455 bytes
macros.bas
8c21c322bb8b23e7dbfa4da0de1c41676162b0810e96582d1365413c12adc768		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 977 bytes

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