Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 47c9d99ba97fb6ea…

MALICIOUS

Office (OLE) / .XLS

188.0 KB Created: 2021-12-16 12:07:56 Authoring application: Microsoft Excel@轌Ǘ@㔀�Ǘ
MD5: 4f91b85a145f9b64e079fc3fa0d10066 SHA-1: 29258df5427d5f817acd7a0e6afe532cb8ff16e9 SHA-256: 47c9d99ba97fb6eaaea5a6410617f2bfa9234a1024d795807f206fc041e6f59f
222 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample is an Excel 4.0 macro-enabled spreadsheet that attempts to lure the user into enabling content. The XLM macros contain a call to FOPEN("C:\ProgramData\EeNbeYjjvFGxXhOdlQCM RlhU.vbs",3), indicating an attempt to open and likely execute a VBScript payload from a specific path. The embedded URLs, while marked as benign, were likely part of the initial download chain.

Heuristics 6

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • URL reconstructed from XLM cell array (3 URLs) critical OLE_XLM_CELL_ARRAY_URL
    Excel 4.0 macro sheet stages its payload URL across the BIFF8 Shared String Table (one quoted-char SST entry concatenated with & at runtime) or across individual numeric cells (one ASCII charcode per cell). The reconstructed URL is invisible to literal-bytes URL extraction because it is never contiguous in the workbook stream. URLs were recovered by walking the BIFF8 record stream and decoding SST entries plus LABELSST/RK/NUMBER cells.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
  • 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
  • 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://cdn.discordapp.com/attachments/910256475912425536/921395489738477618/viUkZmerrynigga.bin
    • https://cdn.discordapp.com/attachments/910256475912425536/921395071063031878/thhBjmvULUHmerrynigga.bin
    • https://cdn.discordapp.com/attachments/910256475912425536/921395173613789204/hEPBgMhJUmerrynigga.bin

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
9033aecabb2bfc9581d0feaf0f6d08230425b4b14684ff2a3bf083ac01a4b87c		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 4045 bytes

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