Dridex — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 64d0c3abb69565bb…

MALICIOUS

Office (OOXML) / .XLSM

256.6 KB Created: 2021-03-08 16:25:41 UTC Authoring application: Microsoft Excel 15.0300
MD5: b655d87f41a5229d11f05b02c5d67dad SHA-1: eacd27a128dbf1fde6374ad18026461bc12c607a SHA-256: 64d0c3abb69565bb7a9cced68e5034cb6366eb77809eba347aece577a0a9e4f7
270 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is an XLSM file containing VBA macros, specifically a Workbook_Open macro that is designed to execute automatically. The ClamAV detection and heuristic firings strongly indicate this is a Dridex dropper. The VBA code appears to be obfuscated but likely uses the GetObject call to download and execute a second-stage payload from one of the embedded URLs.

Heuristics 8

  • ClamAV: Doc.Dropper.Dridex-9845759-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Dridex-9845759-0
  • 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.
  • 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.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • 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://triplonet.com.br/__MACOSX/wp-includes/js/codemirror/3Uqzx5RTyl8pT.php
    • https://familystory.es/wp-content/uploads/2021/01/InOm7e9u4vMmW.php
    • https://fortgem.co.uk/wp-includes/css/dist/block-directory/Pk57G2yz.php
    • https://crm.sgdatapos.com/modules/goals/language/bulgarian/vdOwNUr2yXh.php
    • https://equiposautomotriz.com/wp-includes/Requests/Exception/HTTP/U997eIiQSqs3.php
    • https://gesky.co.tz/wp-includes/sodium_compat/namespaced/Core/HMJi1PQC.php
    • https://slaweskicpa.com/tmp/install_5a4f05d42cc52/install_5a4f05f303fa0/backend/vlvzskOj4To9.php
    • https://eletronicaeduardo.com.br/www3/sistema/application/config/ANBPUKvb49gQn.php
    • https://mishpachton.club/wp-content/uploads/2020/01/sULnmh1mel6Ha.php
    • https://dentaldesignstudiowi.com/wp-content/uploads/2021/01/9eFsntMZ.php
    • http://www.w3.org/1999/XSL/Transform

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
cd8516a595634554f4cb5fba064a3d843e1f77bdc46771858382ce8a872d5f9c		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 13399 bytes
vbaProject_00.bin
17bef46ef00c22a55605302954ba7a206d652a5733ff3c4e2ffae96f8f7602b7		 vba-project OOXML VBA project: xl/vbaProject.bin 70656 bytes
Detection
ClamAV: Doc.Dropper.Dridex-9845759-0
Obfuscation or payload: unlikely

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