Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 77170f6d34fc6eb9…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:20 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: 93225e3138c36bce463cb6dda96e0565 SHA-1: 6f49b3038fb716a384c5690b0741c3cc2b330770 SHA-256: 77170f6d34fc6eb970bfd077999c42a28fabbba4eb04292fcb6282d6b5854b60
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 macro, which is a known technique for executing malicious code upon opening the document. The presence of dangerous formula APIs like RUN indicates an intent to execute external commands or payloads. While no specific URLs or hashes were extracted, the Auto_Open macro itself is a critical indicator of 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) 6584 bytes
SHA-256: aa22f2671be15f1d3e6e1e040c16d37ccd822b67a8c69ca559dde458d43df27e
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  TYkaHDJYD
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B174 
' 0018     24 LABEL : Cell Value, String Constant - BUcPzpmWG len=0 
' 0018     23 LABEL : Cell Value, String Constant - eHbSuAnH len=0 
' 0018     23 LABEL : Cell Value, String Constant - eWSKPzXK len=0 
' 0018     25 LABEL : Cell Value, String Constant - fckLfMkOwh len=0 
' 0018     23 LABEL : Cell Value, String Constant - FuFZnwEN len=0 
' 0018     27 LABEL : Cell Value, String Constant - FUusiNzsMLOx len=0 
' 0018     20 LABEL : Cell Value, String Constant - GXuxO len=0 
' 0018     23 LABEL : Cell Value, String Constant - jnstOZuZ len=0 
' 0018     24 LABEL : Cell Value, String Constant - LRRTIBXZh len=0 
' 0018     27 LABEL : Cell Value, String Constant - njZoBxwezeMa len=0 
' 0018     21 LABEL : Cell Value, String Constant - nSSiEm len=0 
' 0018     22 LABEL : Cell Value, String Constant - PSxkmie len=0 
' 0018     26 LABEL : Cell Value, String Constant - syrJKdjuMdi len=0 
' 0018     27 LABEL : Cell Value, String Constant - UPXmhiPhoBmq len=0 
' 0018     26 LABEL : Cell Value, String Constant - uvNDwuNgeEh len=0 
' 0018     21 LABEL : Cell Value, String Constant - VbDPwt len=0 
' 0018     21 LABEL : Cell Value, String Constant - WGYiwt len=0 
' 0018     24 LABEL : Cell Value, String Constant - XLrEcgHMx len=0 
' 0018     25 LABEL : Cell Value, String Constant - yFAaxJsXzW len=0 
' 0018     24 LABEL : Cell Value, String Constant - YHKStSeIC 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
'
... (truncated)

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