Xls.Dropper.Agent-7915749-0 — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 cc8fd2dddf219a22…

MALICIOUS

Office (OOXML) / .XLSM

63.1 KB Created: 2020-05-27 09:14:17 UTC Authoring application: Microsoft Excel 16.0300
MD5: 0bbf25412b4dc63e5bb137d0ed782a93 SHA-1: 150de11c2e42512329c1baa30b2e40a5d397a7d3 SHA-256: cc8fd2dddf219a22e108fc0aa92f08279c60b1919da54b6ddd8f328d1ce3ec0e
320 Risk Score

Malware Insights

Xls.Dropper.Agent-7915749-0 · confidence 95%

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

This XLSM file contains VBA macros that utilize WScript.Shell and the Shell() function to execute commands. The ClamAV detection 'Xls.Dropper.Agent-7915749-0' and the heuristic firings strongly indicate that the macros are designed to download and execute a second-stage payload. The embedded artifact 'macros.bas' likely contains the malicious script. The presence of an embedded URL, though not explicitly detailed, further supports the dropper functionality.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • ClamAV: Xls.Dropper.Agent-7915749-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7915749-0
  • 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.
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — VBA macros present
  • Suspicious extracted artifact medium 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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
50e689e6226f508ed9641fffbda69dde5579eb92f3a35ed86c8124516e5ad3c1		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1134 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).
vbaProject_00.bin
473343922b138679c021fb94a1444c9b9ff2c744a40dcc4361260651965d985c		 vba-project OOXML VBA project: xl/vbaProject.bin 10752 bytes
Detection
ClamAV: Xls.Dropper.Agent-7915749-0
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).
emf_00.emf
76f287b1e3251b7e0e5ba27bfb05b35831150cc665de00f9fd2d807e2d2a028d		 ooxml-emf OOXML EMF part: xl/media/image1.emf 1976 bytes

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