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

Static analysis result for SHA-256 c99d8022ba102c41…

MALICIOUS

Office (OOXML) / .XLSM

56.6 KB Created: 2022-06-25 19:05:11 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2022-11-09
MD5: fed5ca25e44378f5d0855ff53471a0fd SHA-1: 07e15c01242644b8ba067e19dc5e2cda116ad66d SHA-256: c99d8022ba102c4152c0bb445a4cb90616bf77d9ad329432cacbe1243068bd5f
322 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer T1204.002 Malicious File

The sample is an XLSM file containing VBA macros. The 'auto_close' macro utilizes WScript.Shell and CreateObject to download a DLL from the URL 'https://irs.reviews/KFOJRIOHNV(R)(A#IFK)_FIO#)_FK_D/0411r_cr3.dll' and save it to the user's Documents folder as 'name.dll'. This indicates a downloader pattern, aiming to execute a second-stage payload.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — 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 https://irs.reviews/KFOJRIOHNV(R)(A#IFK)_FIO#)_FK_D/0411r_cr3.dll

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
65ed5572fcf01a1821ad65b49df66e453b48476f7fabd9910864d27b09515864		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 3594 bytes
vbaProject_00.bin
159a955f2a98103e38cb239a487b4751893ac123bd530b44060b384190971679		 vba-project OOXML VBA project: xl/vbaProject.bin 22528 bytes

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