Malicious Office (OOXML) / .XLSM — malware analysis report

Static analysis result for SHA-256 db9b4508af866167…

MALICIOUS

Office (OOXML) / .XLSM

42.2 KB Created: 2020-01-28 19:47:00 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-07-24
MD5: 2e72459d0c5413b519e578884dab6eed SHA-1: c73755b2c8bc1bb9c49d3d39e02710080b960810 SHA-256: db9b4508af866167280ef5db74f39f9243862f223f49a6e40b3711d949e3632f
430 Risk Score

Malware Insights

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

The Workbook_Open macro contains obfuscated PowerShell code that, once deobfuscated, attempts to download and execute a file from 'http://179.43.175.187/bwvv/New order-list.exe'. The document body itself contains a lure to enable content, which is a common tactic for macro-based malware. The ClamAV detection further confirms the malicious nature of the file.

Heuristics 11

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • Obfuscated VBA Shell command with URL critical OLE_VBA_OBFUSCATED_SHELL_URL
    VBA macro invokes Shell with command text assembled through decoder or string-manipulation functions and includes a URL. This is a high-confidence downloader/dropper pattern, stronger than Shell or URL evidence on their own.
  • ClamAV: Xls.Dropper.EPPlus-9802867-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.EPPlus-9802867-2
  • 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.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • 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
  • External hyperlinks (3) low OOXML_EXTERNAL_HYPERLINKS
    Document contains 3 external hyperlinks — clickable URLs are stored as external relationships. First target: http://go.microsoft.com/fwlink/?LinkId=846285
  • 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://179.43.175.187/bwvv/New
    • http://go.microsoft.com/fwlink/?LinkId=846285
    • http://go.microsoft.com/fwlink/?LinkId=844969

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
9c6e0de07d11ca9fdcc4e4b9f2da08ea36af2534efacf3edf321225471a20681		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1610 bytes
vbaProject_00.bin
2eae85d423d2e02f9047b4e73fae6c942512121b7095db08d5d17a6a7a4fae6f		 vba-project OOXML VBA project: xl/vbaProject.bin 6144 bytes
Detection
ClamAV: Xls.Dropper.EPPlus-9802867-2
Obfuscation or payload: unlikely

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