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

Static analysis result for SHA-256 06e223bb2af0e00e…

MALICIOUS

Office (OOXML) / .XLSM

388.4 KB Created: 2020-01-28 19:47:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: fddb915231bd05bdb40250bd9ca9327a SHA-1: 95e69dffccc8c93611de153fd9993faefc4b0f5f SHA-256: 06e223bb2af0e00e3c5c7d2a0574e0cf69716f82432665221d49f62a8613b5ed
170 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

This XLSM file contains a VBA macro that is obfuscated using string concatenation. The macro reconstructs a PowerShell command which downloads a file from 'http://transfer.sh/get/i16FQb/word.exe' and executes it. The document body contains instructions on how to use Excel features, likely as a lure to encourage users to enable macros.

Heuristics 6

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Dangerous API name reassembled from split string literals critical OLE_VBA_SPLIT_KEYWORD_OBFUSCATION
    VBA concatenates short string literals that reassemble a dangerous API/ProgID/LOLBin name (e.g. Scripting.FileSystemObject, WScript.Shell, powershell, URLDownloadToFile) which appears in no single literal. Splitting an API name across string concatenation is done only to evade keyword scanning.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • External hyperlinks (6) low OOXML_EXTERNAL_HYPERLINKS
    Document contains 6 external hyperlinks — clickable URLs are stored as external relationships. First target: https://go.microsoft.com/fwlink/?linkid=844736
  • 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://go.microsoft.com/fwlink/?linkid=844736
    • http://go.microsoft.com/fwlink/?LinkId=844969
    • https://go.microsoft.com/fwlink/?linkid=844741
    • https://go.microsoft.com/fwlink/?linkid=844732
    • https://go.microsoft.com/fwlink/?linkid=844744
    • https://go.microsoft.com/fwlink/?linkid=844735
    • https://go.microsoft.com/fwlink/?linkid=844725
    • https://go.microsoft.com/fwlink/?linkid=844739
    • https://go.microsoft.com/fwlink/?linkid=844751
    • https://go.microsoft.com/fwlink/?linkid=844752
    • https://go.microsoft.com/fwlink/?linkid=844745
    • https://go.microsoft.com/fwlink/?linkid=844728
    • https://go.microsoft.com/fwlink/?linkid=844746
    • https://go.microsoft.com/fwlink/?linkid=844747
    • https://go.microsoft.com/fwlink/?linkid=844726
    • https://go.microsoft.com/fwlink/?linkid=844750
    • https://go.microsoft.com/fwlink/?linkid=844738
    • http://go.microsoft.com/fwlink/?LinkId=846285
    • https://go.microsoft.com/fwlink/?linkid=844749

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
21c29af6003124d873c6b0983a98f139ffba499c72f1cdea24574c7c1560941d		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 5917 bytes
vbaProject_00.bin
94edfcbc1db3f1e969e1f7729cc5786a82eb8d4ebb440b4b66359119c10814d7		 vba-project OOXML VBA project: xl/vbaProject.bin 10752 bytes

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