Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d73e88fa12ddacc0…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:10 Authoring application: Microsoft Excel First seen: 2021-10-14
MD5: 1536c03232abc2f0fcec96e3b57ed09b SHA-1: f14d7a5e94fd9c2940a4e52cbf29345276d37b38 SHA-256: d73e88fa12ddacc0020a536b29b4497583092c2cd406789aea688faf11cb6019
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 suggests the macro is designed to execute external code. While no specific URLs or hashes were extracted, the technique strongly implies the download and execution of a secondary 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) 6506 bytes
SHA-256: 2f593e79cefe041ee574e3dc9426e1822bbb203c912106c3b560d575700dceea
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  jUshP
' 0018     20 LABEL : Cell Value, String Constant - aUQkb len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B164 
' 0018     26 LABEL : Cell Value, String Constant - DVgLdvrrzyx len=0 
' 0018     25 LABEL : Cell Value, String Constant - eLmGEloDwU len=0 
' 0018     25 LABEL : Cell Value, String Constant - gpcLhyzLoB len=0 
' 0018     27 LABEL : Cell Value, String Constant - gpHOXseLYRhi len=0 
' 0018     24 LABEL : Cell Value, String Constant - GXUFEwdEm len=0 
' 0018     20 LABEL : Cell Value, String Constant - hHsvY len=0 
' 0018     23 LABEL : Cell Value, String Constant - HptmbflS len=0 
' 0018     24 LABEL : Cell Value, String Constant - kcSKpRmox len=0 
' 0018     25 LABEL : Cell Value, String Constant - LbDGSbCCbZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - LBSvifjKgTvx len=0 
' 0018     22 LABEL : Cell Value, String Constant - ovlkSMw len=0 
' 0018     25 LABEL : Cell Value, String Constant - QusOTtggFn len=0 
' 0018     21 LABEL : Cell Value, String Constant - SMoQlt len=0 
' 0018     24 LABEL : Cell Value, String Constant - TMcckDPTP len=0 
' 0018     20 LABEL : Cell Value, String Constant - uaDTM len=0 
' 0018     23 LABEL : Cell Value, String Constant - VFpkxYey len=0 
' 0018     27 LABEL : Cell Value, String Constant - YdGCgnyoirvW len=0 
' 0018     24 LABEL : Cell Value, String Constant - zjEkvMJuk len=0 
' 0018     26 LABEL : Cell Value, String Constant - ztioMVbTdNe 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
' 0
... (truncated)

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