Dridex — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 23c625b550dea7fb…

MALICIOUS

Office (OLE) / .XLS

798.5 KB Created: 2021-01-27 15:43:26 Authoring application: Microsoft Excel
MD5: caf32427ed8b4558c25adbf5c3701594 SHA-1: d6be6c4b01e1690923b06253783c79ce3b352e14 SHA-256: 23c625b550dea7fb8847a4c34f931181066e18a97ea40d3018d6a1f77ece9772
288 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The critical ClamAV detection and high-severity heuristics for VBA macros, including Workbook_Open auto-execution and GetObject calls, strongly indicate a malicious dropper. The presence of obfuscated VBA code and multiple unknown-reputation URLs suggests the macro attempts to download and execute a second-stage payload, consistent with Dridex activity. The file's purpose is to act as an initial infection vector.

Heuristics 9

  • ClamAV: Doc.Dropper.Dridex-9845759-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Dridex-9845759-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject 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.
  • 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 http://pbotv.tv/wp-content/plugins/sg-cachepress/vendor/a5hleyrich/y8UzX1Zf0ZWtO.php
    • http://veedverksracing.com/wp-content/themes/colormag/SCSS/footer/eDI5l5E8wU.php
    • http://banananepal.com/wp-content/plugins/js_composer/include/autoload/wd9U0zbVKu.php
    • https://dev.claritycareercounseling.com/wp-content/themes/hexagon/template-parts/footer/IZ07xHMuYU.php
    • http://api.jczhaopin.com/lingsheng/public/phpqrcode/bindings/tcpdf/yoc2qvFxposK.php
    • https://online.velikan.info/wp-content/plugins/contact-form-7/includes/css/gRQsQEiJFU.php
    • http://kardekormimarlik.com.tr/plugins/revolution/revolution/js/extensions/xMChkWxBJWgX.php
    • https://rhinomoney.in/wp-includes/js/tinymce/plugins/charmap/5BdBghvf.php
    • https://ieponline.org/dev/ieponline/addons/addons/bootstrap/J81OGuD0bOsoD.php
    • https://mail.rigid-group.com/jp/phpformbuilder/plugins/bootstrap-select/dist/3IuERBhaVZsMf.php
    • http://www.w3.org/1999/XSL/Transform

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
e6be827ee0f4fad58aaae5d45cc7f021481a4c5b56843a491fcac4029f65aaae		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 17668 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 125 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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