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

Static analysis result for SHA-256 b34459452ccc6dc1…

MALICIOUS

Office (OOXML) / .XLSM

56.4 KB Created: 2022-06-25 19:05:11 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2022-11-09
MD5: cd67efd2d67af651b798ef6e345399de SHA-1: cd83b6f54770e1a856852c153800cca0a5d84bce SHA-256: b34459452ccc6dc19b432455779d3c881926f202d93158e846f94d979e9361e7
322 Risk Score

Malware Insights

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

The XLSM file contains VBA macros, specifically an Auto_Close macro, which is designed to execute automatically when the document is closed. This macro utilizes WScript.Shell and CreateObject to download a DLL payload from the URL 'https://irs.reviews/KFOJRIOHNV(R)(A#IFK)_FIO#)_FK_D/0411r_cr1.dll' and saves it as 'name.dll' in the user's Documents folder. The downloaded file is then likely executed, indicating a downloader or dropper 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
  • 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_cr1.dll

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
a9d1bfec227ad6d1079014cc7527dec54d7b31f68819817eaa4efcb83d9f84d7		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 3594 bytes
vbaProject_00.bin
5dd9f5403f5fe77862400b7f3df88b51eabced2943a52199d85d206cce4b12b4		 vba-project OOXML VBA project: xl/vbaProject.bin 25088 bytes

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