Dridex — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 83c44b48121f7b79…

MALICIOUS

Office (OOXML) / .XLSX

411.8 KB Created: 2020-04-06 15:12:39 UTC Authoring application: Microsoft Excel 16.0300
MD5: 24a2eee53500ad0fa4003f383631b1b5 SHA-1: 968a1ef2a0015f55a0d80afda26e34580986b5c8 SHA-256: 83c44b48121f7b79716fb6d0fdac68d9a3d38c832c15c1637ed0c3dfbaea471f
280 Risk Score

Malware Insights

Dridex · confidence 95%

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

The sample is an Excel file containing a Workbook_Open VBA macro. This macro utilizes a character-shift decoder combined with Shell() calls to execute a command. ClamAV identifies this as a Dridex downloader variant. The primary intent appears to be downloading and executing a second-stage payload.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • VBA character-shift decoded Shell command critical OLE_VBA_ASC_CHR_SHIFT_SHELL
    VBA auto-exec macro stores an encoded command string, decodes it with a Mid/Asc/Chr character-shift loop, and passes the recovered text to Shell. This is a high-confidence command stager.
  • ClamAV: Xls.Downloader.DridexGreen09213-9890103-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.DridexGreen09213-9890103-0
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • 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
  • 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://schemas.openxmlformats.org/spreadsheetml/2006/main
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac
    • http://schemas.microsoft.com/office/spreadsheetml/2014/revision
    • http://schemas.microsoft.com/office/spreadsheetml/2015/revision2
    • http://schemas.microsoft.com/office/spreadsheetml/2016/revision3

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7b553490217154b4a8060468fa3f4484173bf20013c945acad4006edc9343315		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2598 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
3c494196ad71af0157c1f1c383ae14d794b8dcac6beb1a899d536d155c46c348		 vba-project OOXML VBA project: xl/vbaProject.bin 17408 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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