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

Static analysis result for SHA-256 92174e27cd789845…

MALICIOUS

Office (OLE) / .XLS

764.5 KB Created: 2023-03-28 13:03:28 Authoring application: Microsoft Excel First seen: 2023-04-19
MD5: 8ca7751b32318f8de62a66af687bc046 SHA-1: a2cdee58c26b01e4c806fa6bf6f95d21e89ec970 SHA-256: 92174e27cd789845bcd54f9efd543e404b85ce2b25b122cf5a9d34e6238d968c
410 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1140 Deobfuscate/Decode Files or Information

The sample is a macro-enabled Excel file containing an obfuscated VBA loader within the Workbook_Open subroutine. This loader utilizes CreateObject and CallByName to execute shell commands, likely to download and run a secondary payload. The presence of 'SC_STR_SHELLEXEC' and 'SC_STR_WSCRIPT' heuristics further supports this, indicating the use of scripting and shell execution for malicious purposes. The document body and embedded XML suggest a lure related to Oracle business applications, potentially to disguise the malicious intent.

Heuristics 12

  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • CallByName call high OLE_VBA_CALLBYNAME
    CallByName call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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 https://ebsprd.karuvoolam.tn.gov.in:443/OA_MEDIA/graphall_enabled.png
    • https://ebsprd.karuvoolam.tn.gov.in:443/OA_MEDIA/montior.png
    • https://ebsprd.karuvoolam.tn.gov.in:443/OA_MEDIA/listofvalues.png
    • https://ebsprd.karuvoolam.tn.gov.in:443/OA_MEDIA/filter.png
    • https://ebsprd.karuvoolam.tn.gov.in:443/OA_MEDIA/download_enabled.png
    • https://ebsprd.karuvoolam.tn.gov.in:443/OA_MEDIA/graphselection_enabled.png
    • https://ebsprd.karuvoolam.tn.gov.in:443/OA_MEDIA/settings_enabled.png
    • https://ebsprd.karuvoolam.tn.gov.in:443/OA_MEDIA/uploadall_enabled.png
    • https://ebsprd.karuvoolam.tn.gov.in:443/OA_MEDIA/switchresponsibility.png
    • https://ebsprd.karuvoolam.tn.gov.in:443/OA_MEDIA/resetfilters_enabled.png
    • https://ebsprd.karuvoolam.tn.gov.in:443/OA_MEDIA/upload.png
    • https://ebsprd.karuvoolam.tn.gov.in:443/OA_MEDIA/graphvariation_enabled.png
    • https://ebsprd.karuvoolam.tn.gov.in:443/OA_HTML/
    • https://ebsprd.karuvoolam.tn.gov.in:443/OA_HTML/BneApplicationService
    • https://ebsprd.karuvoolam.tn.gov.in:443/OA_HTML/BneComponentService
    • https://ebsprd.karuvoolam.tn.gov.in:443/OA_HTML/BneUploaderService
    • https://ebsprd.karuvoolam.tn.gov.in:443/OA_HTML/BneDownloadService
    • https://ebsprd.karuvoolam.tn.gov.in:443/OA_HTML/�
    • https://ebsprd.karuvoolam.tn.gov.in:443/OA_HTML//
    • https://ebsprd.karuvoolam.tn.gov.in:443/OA_HTML//BneUploaderService?bne:tickleSession=True
    • http://www.oracle.com/bne
    • http://schemas.microsoft.com/office/2006/01/customui
    • http://schemas.openxmlformats.org/package/2006/relationships
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships/image
    • http://schemas.microsoft.com/office/2006/relationships/ui/extensibility
    • http://schemas.openxmlformats.org/package/2006/content-types

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
31b285929aa0b4d44adcda6950b84730bea56ce55b12702181b3d2db151e12d0		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 357007 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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