Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7854be680c8b6aaf…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:40:44 Authoring application: Microsoft Excel First seen: 2021-06-28
MD5: 0e99a4b0571d6513b0d5287bbb16363e SHA-1: c9ffd9a085dcfb195730fdf753e2735787237847 SHA-256: 7854be680c8b6aaf3bbd6ceaa25213b96b4cdf25bff2b07c455a2cb9046eebec
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 defined name, which is a critical finding indicating automatic execution upon opening. The presence of dangerous formula APIs like RUN further suggests malicious intent. The macro sheet itself is likely designed to download and execute a second-stage payload.

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) 6617 bytes
SHA-256: e7767d483bcb04b59a401662dc78704c3af4c22346387d0bb45bffb638140221
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  ShJw
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D162 
' 0018     23 LABEL : Cell Value, String Constant - bcTJWZVB len=0 
' 0018     24 LABEL : Cell Value, String Constant - fRjYuhtDU len=0 
' 0018     21 LABEL : Cell Value, String Constant - ftWUai len=0 
' 0018     23 LABEL : Cell Value, String Constant - iQYOPZSn len=0 
' 0018     27 LABEL : Cell Value, String Constant - juoXncuEyBMC len=0 
' 0018     24 LABEL : Cell Value, String Constant - kimFSOrkt len=0 
' 0018     24 LABEL : Cell Value, String Constant - lFuloWkey len=0 
' 0018     25 LABEL : Cell Value, String Constant - MODSQFkGUg len=0 
' 0018     22 LABEL : Cell Value, String Constant - PggLJOR len=0 
' 0018     21 LABEL : Cell Value, String Constant - pjFYOr len=0 
' 0018     23 LABEL : Cell Value, String Constant - POHjzCui len=0 
' 0018     22 LABEL : Cell Value, String Constant - qWUtBpP len=0 
' 0018     27 LABEL : Cell Value, String Constant - SxvqdMVKfxHI len=0 
' 0018     24 LABEL : Cell Value, String Constant - SyGKDpPOX len=0 
' 0018     22 LABEL : Cell Value, String Constant - tebVgFa len=0 
' 0018     22 LABEL : Cell Value, String Constant - TvCZhLL len=0 
' 0018     23 LABEL : Cell Value, String Constant - vdUNIMdO len=0 
' 0018     20 LABEL : Cell Value, String Constant - wvOdV len=0 
' 0018     21 LABEL : Cell Value, String Constant - YCBSQL len=0 
' 0018     22 LABEL : Cell Value, String Constant - yzqbNsn 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
... (truncated)

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