Xls.Dropper.Agent-7647242-0 — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 c0cd3ca69a7811e2…

MALICIOUS

Office (OOXML) / .XLSX

98.0 KB Created: 2020-03-17 22:06:00 UTC Authoring application: Microsoft Excel 16.0300
MD5: 00e375d2cdc13caa03863a2dde06ed2b SHA-1: 49838fa0f99f29f9cbb27014ac9347dab7e4c5ba SHA-256: c0cd3ca69a7811e27bdf3290ad3cf08e4212d40066d7cf52a4b6a977c5867b06
280 Risk Score

Malware Insights

Xls.Dropper.Agent-7647242-0 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell

The file is an Excel macro-enabled document containing a Workbook_Open macro. This macro utilizes a Shell() call, a critical heuristic firing, indicating it is designed to execute arbitrary commands. ClamAV detections further confirm its malicious nature as a dropper. The primary function appears to be executing a secondary payload via the Shell() function.

Heuristics 6

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Xls.Dropper.Agent-7647242-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7647242-0
  • 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
  • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
f873b75671d653bd7d6427d323b2f99211315d898fb397730264c26eec7429dd		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 3356 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
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
5aead163830634e2befa5b423970aa0822fafdee87ff521bf7fd2ac7ad151ef3		 vba-project OOXML VBA project: xl/vbaProject.bin 15872 bytes
Detection
ClamAV: Xls.Dropper.Agent-7647242-0
Obfuscation or payload: likely
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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