Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6c7515eead273c56…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:40:31 Authoring application: Microsoft Excel First seen: 2021-09-29
MD5: 976541f82d4155daebbe46d6edf4d0d5 SHA-1: c6d19dfb43bfcf48a6730afe8fd35552987b95b6 SHA-256: 6c7515eead273c560eafa91bce29fc754e945c8646bef22d8fc45a75541b1e6e
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 method for executing malicious code. The presence of dangerous formula APIs like RUN indicates an attempt to run arbitrary commands. Without further script content, the exact payload and delivery mechanism remain unknown, but the intent is clearly to execute code upon opening.

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) 6368 bytes
SHA-256: b28c9025375d1863cc0549be8be67daeaac3685955c8e4080267e4e4da16a63a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  tpv
' 0018     27 LABEL : Cell Value, String Constant - aAKsjKPLyheK len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B168 
' 0018     21 LABEL : Cell Value, String Constant - axDcaL len=0 
' 0018     22 LABEL : Cell Value, String Constant - aZlxbUx len=0 
' 0018     23 LABEL : Cell Value, String Constant - BetFspfW len=0 
' 0018     20 LABEL : Cell Value, String Constant - bpXtA len=0 
' 0018     21 LABEL : Cell Value, String Constant - CIBlCl len=0 
' 0018     21 LABEL : Cell Value, String Constant - EQMIJj len=0 
' 0018     24 LABEL : Cell Value, String Constant - gyGQVVhhn len=0 
' 0018     21 LABEL : Cell Value, String Constant - HLFYbp len=0 
' 0018     22 LABEL : Cell Value, String Constant - ilYRQgI len=0 
' 0018     26 LABEL : Cell Value, String Constant - IMyPdyPacQO len=0 
' 0018     25 LABEL : Cell Value, String Constant - iztAjQxKTC len=0 
' 0018     26 LABEL : Cell Value, String Constant - JKyEGrLbyIp len=0 
' 0018     23 LABEL : Cell Value, String Constant - jXPGVvjT len=0 
' 0018     26 LABEL : Cell Value, String Constant - KKGxDSqqPQh len=0 
' 0018     26 LABEL : Cell Value, String Constant - pHqIeigwQSQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - TzpIcD len=0 
' 0018     20 LABEL : Cell Value, String Constant - VWGuG len=0 
' 0018     26 LABEL : Cell Value, String Constant - WcrVDeKsWJQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - WLVzZlLJfY 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 LAB
... (truncated)

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