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

Static analysis result for SHA-256 22f21af5c55da4dd…

MALICIOUS

Office (OOXML) / .XLSM

220.8 KB Created: 2021-05-07 12:30:48 UTC Authoring application: Microsoft Excel 15.0300
MD5: 909d9dbbdb69cda8a52c2ed6137e411d SHA-1: 4b94e8cd1a2ede35e2c425426de7151e0742ccde SHA-256: 22f21af5c55da4dd5cd8ab4807e7697abfe2c64382bdebbf44d1a432a91b4da5
248 Risk Score

Malware Insights

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

The sample is a macro-enabled Excel file containing a Workbook_Open macro that utilizes CreateObject to execute commands via rundll32.exe. The embedded URLs are likely used to download and execute a second-stage payload. The ClamAV detection as '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://sportsfort.com.pk/wp-content/themes/porto/scss/plugins/cH1xmIuywQD.php
    • https://ncc-services.com/ncc_hr/js/tinymce/plugins/advlist/Qw3HExfj.php
    • https://2nub.es/lib/js/prettyphoto/images/prettyPhoto/DDndV1TI5lvC3M7.php
    • https://trenerwpoznaniu.pl/classes/tinymce/themes/inlite/config/WjCKp9Cb.php
    • https://repvoice.com/ltYn1z6L3M0Dr4.php
    • https://jajainfo.net/zm/wp-content/uploads/2013/06/b4KjNHHVq5p.php
    • https://theaccentchairs.com/wp-content/plugins/woocommerce/vendor/automattic/rWohwKVhOY7IPnR.php
    • https://natalierosenberg.com/wp-content/plugins/jetpack/images/apps/4dyIrpZd9bMQ.php
    • https://cartoonist.me.uk/wp-content/plugins/jetpack/scss/_utilities/us1svv7BFHAuE.php

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
6b667c89d834a446b854a7438a8609b9a21e133774e8854f36d41fa4a61b7a82		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 40932 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
815f67fb85d64ccfee133988acaaa71c4610f9f9c5dc846565a09a486cdfd465		 vba-project OOXML VBA project: xl/vbaProject.bin 260096 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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