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

Static analysis result for SHA-256 cc52b8f39a31d737…

MALICIOUS

Office (OOXML) / .XLSM

410.8 KB Created: 2021-01-18 10:39:52 UTC Authoring application: Microsoft Excel 16.0300
MD5: 2c71ebde60e06f76a2ccc831400f24b7 SHA-1: 7d7294586a74052bce542ba4cd1fb3eeb2ea08a3 SHA-256: cc52b8f39a31d7372f7c3d76e386fa20f830b530dec05ce67229e4abf33c92d9
328 Risk Score

Malware Insights

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

This XLSM file contains a Workbook_Open macro that utilizes WScript.Shell and CreateObject to execute arbitrary commands. The macro is designed to download and execute a second-stage payload, as indicated by the ClamAV detection of 'Xls.Downloader.DridexGreen09213-9890103-0'. The presence of Shell() and WScript.Shell usage strongly suggests a downloader or droppper functionality.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • 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
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
3b2a81de1b8f85112edd42d04606c23547bda8d1a05ef0f333301f6f0caaf6ad		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1465 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 1 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
610c75d159d03a5c40e7b0605910433189826ca052c163514c4f710902022203		 vba-project OOXML VBA project: xl/vbaProject.bin 16896 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 1 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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