Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 57966471c7f1a0b8…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:45:39 Authoring application: Microsoft Excel First seen: 2021-09-23
MD5: 509473d9a7fc42f871e3f1525cdd0211 SHA-1: 646e231afc7065b6d81ebdcb62978d6eb533a1d3 SHA-256: 57966471c7f1a0b8aa82ef85afe8e880c73017edd092967307d0907ad6bb3c3b
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled workbook. Heuristics indicate the presence of an Auto_Open macro that utilizes dangerous formula APIs, specifically referencing 'RUN=0'. This strongly suggests the macro is designed to execute arbitrary code or download a secondary payload. The obfuscated document body content does not provide further clues about the specific lure.

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) 6445 bytes
SHA-256: d44eba63912e3d746ea293eb986cca2aca043f98956de06fa73434c2c26c2294
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 -  vTk
' 0018     21 LABEL : Cell Value, String Constant - AFeJHR len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E177 
' 0018     26 LABEL : Cell Value, String Constant - clETVSjiOkA len=0 
' 0018     22 LABEL : Cell Value, String Constant - cMvxeVW len=0 
' 0018     21 LABEL : Cell Value, String Constant - fbaotW len=0 
' 0018     27 LABEL : Cell Value, String Constant - FHUAzWcSoaNw len=0 
' 0018     24 LABEL : Cell Value, String Constant - FZOTvMjCp len=0 
' 0018     24 LABEL : Cell Value, String Constant - GqSPMAnUz len=0 
' 0018     27 LABEL : Cell Value, String Constant - hTsJawVTBrtJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - iPWCAnJisCDP len=0 
' 0018     20 LABEL : Cell Value, String Constant - JYofs len=0 
' 0018     23 LABEL : Cell Value, String Constant - KUrxaZpm len=0 
' 0018     23 LABEL : Cell Value, String Constant - luDasnDH len=0 
' 0018     25 LABEL : Cell Value, String Constant - okseWnRVYu len=0 
' 0018     24 LABEL : Cell Value, String Constant - SAZvvZbnA len=0 
' 0018     25 LABEL : Cell Value, String Constant - sKRrVcTdCv len=0 
' 0018     24 LABEL : Cell Value, String Constant - tvDerWdbg len=0 
' 0018     25 LABEL : Cell Value, String Constant - wDiMwhqMhp len=0 
' 0018     21 LABEL : Cell Value, String Constant - wLIFkS len=0 
' 0018     27 LABEL : Cell Value, String Constant - WqlMmJBgpVoy len=0 
' 0018     21 LABEL : Cell Value, String Constant - yrVzDy 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
... (truncated)

Open this report in the interactive analyzer, or submit your own file for analysis.