Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f7e045d7a09dd232…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:45:31 Authoring application: Microsoft Excel First seen: 2021-07-02
MD5: 745937e4585e3ee2897a8b159ca8914a SHA-1: d1a0d563a3aaf8b0d79edc03ff3d45405c8cf467 SHA-256: f7e045d7a09dd2323bbeaba3a954596ff31e9d52a815e7af1d9aae81dc6e166c
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros, specifically an Auto_Open function, which is a known technique for executing malicious code. The presence of dangerous formula APIs like RUN indicates the macro is designed to run arbitrary commands. The macro sheet itself contains obfuscated data, suggesting an attempt to hide its malicious intent.

Heuristics 3

  • 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.
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6396 bytes
SHA-256: 9c3ea774297e12dc72332b8d0a8253dc5c0bd18752d122ac4f20c5b9ce819f38
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  JPcZNT
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I148 
' 0018     21 LABEL : Cell Value, String Constant - BgOkDn len=0 
' 0018     22 LABEL : Cell Value, String Constant - cCHaRpW len=0 
' 0018     20 LABEL : Cell Value, String Constant - cowDj len=0 
' 0018     21 LABEL : Cell Value, String Constant - dpxtYy len=0 
' 0018     22 LABEL : Cell Value, String Constant - fovpqDI len=0 
' 0018     21 LABEL : Cell Value, String Constant - hhRtXy len=0 
' 0018     27 LABEL : Cell Value, String Constant - IAsAQSJjUjZf len=0 
' 0018     26 LABEL : Cell Value, String Constant - IIPYZyIuxQD len=0 
' 0018     21 LABEL : Cell Value, String Constant - lCotEJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - mQLKuyxlp len=0 
' 0018     22 LABEL : Cell Value, String Constant - mRPRUla len=0 
' 0018     20 LABEL : Cell Value, String Constant - nVOpv len=0 
' 0018     23 LABEL : Cell Value, String Constant - nZhZTmuo len=0 
' 0018     27 LABEL : Cell Value, String Constant - ojJiUqqAfVzJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - PJTof len=0 
' 0018     23 LABEL : Cell Value, String Constant - UzmQKWEv len=0 
' 0018     25 LABEL : Cell Value, String Constant - vAWVHJrPYh len=0 
' 0018     22 LABEL : Cell Value, String Constant - vLPoQdb len=0 
' 0018     20 LABEL : Cell Value, String Constant - VLyko len=0 
' 0018     21 LABEL : Cell Value, String Constant - WSyPvp len=0 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Va
... (truncated)

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