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

Static analysis result for SHA-256 316bfe024dc25e21…

MALICIOUS

Office (OOXML) / .XLSM

218.6 KB Created: 2021-05-07 12:31:40 UTC Authoring application: Microsoft Excel 15.0300
MD5: 06930da3673fcc80ffe15f003dcda6eb SHA-1: 50a80c69f7c1af340274c30130f5cb264ec64b2e SHA-256: 316bfe024dc25e21df637ae94bb55709764377f1d17c4169132f6de7fb19b259
248 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is an XLSM file containing a Workbook_Open macro that utilizes CreateObject to execute commands via rundll32.exe. This macro is designed to download and execute a second-stage payload from one of the provided URLs. The ClamAV detection of 'Xls.Downloader.TrendMicroDridex0521-9860965-0' strongly suggests a downloader functionality.

Heuristics 8

  • ClamAV: Xls.Downloader.TrendMicroDridex0521-9860965-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.TrendMicroDridex0521-9860965-0
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • Visible LOLBin command execution instruction high SE_LOLBIN_RUN_COMMAND
    Document contains instructions or visible command text involving Windows script/execution tools such as PowerShell, mshta, cmd, rundll32, or regsvr32
  • 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 project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — 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://jajainfo.net/zm/wp-content/uploads/2013/06/b4KjNHHVq5p.php
    • https://ammarakhizerkhan.com/wp-includes/sodium_compat/src/Core32/ChaCha20/Dn7zOdqooZVw.php
    • https://protetoestufas.com.br/plugins/rainbow/js/language/hnejZqaw.php
    • https://sportsfort.com.pk/wp-content/themes/porto/scss/plugins/cH1xmIuywQD.php
    • https://a14.fiveghosting.com/fBSkQClRc.php
    • https://sezencin.com/ozzzpanel/js/mylibs/forms/uploader/864sv4ph.php
    • https://lerc.gov.lr/231electricity/editor/tinymce/themes/modern/Z9grXigF03Qy.php
    • https://radiotupa.multsis.com.br/4uGJ27Vj5.php
    • https://support.groci.co.ke/qxdVqYUTid.php

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
4625f1909c0101e3fb33cc8657e3fa17674e45a475f186039c9f9a0f17653977		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 42279 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
38b076796feefba58e5aa64bd11cd6b938e181842713f89bb3f598da59040378		 vba-project OOXML VBA project: xl/vbaProject.bin 259072 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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