Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a007cb993c5c6454…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:43:21 Authoring application: Microsoft Excel First seen: 2021-07-10
MD5: 832e197a342464267500211e55be8340 SHA-1: dfa7efbec3707ce110d3bfd1bcde46d72026b223 SHA-256: a007cb993c5c6454f331250229e27cd7343a81a1b1d0933644b8d1966a4d6340
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 containing an Auto_Open function, which is a common technique for executing malicious code upon opening. The critical heuristics indicate the presence of dangerous formula APIs within the macro, suggesting it's designed to run arbitrary commands or download further payloads. No specific family could be identified from the available evidence.

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) 6634 bytes
SHA-256: d326f0bf729fb6b9d4c04dd4f83828ef400c418add560f5cffb2b3fac3526005
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  epOFTcUxIT
' 0018     24 LABEL : Cell Value, String Constant - AfpjgfAHo len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I184 
' 0018     20 LABEL : Cell Value, String Constant - bkWxY len=0 
' 0018     26 LABEL : Cell Value, String Constant - EsYMEBLQUev len=0 
' 0018     25 LABEL : Cell Value, String Constant - fbeKJfEsjZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - HoSSWY len=0 
' 0018     27 LABEL : Cell Value, String Constant - jVwJaSnUCXgg len=0 
' 0018     22 LABEL : Cell Value, String Constant - mGQHsoi len=0 
' 0018     26 LABEL : Cell Value, String Constant - npgLrYHdLSx len=0 
' 0018     26 LABEL : Cell Value, String Constant - oAEehcoEGwC len=0 
' 0018     20 LABEL : Cell Value, String Constant - OldVV len=0 
' 0018     21 LABEL : Cell Value, String Constant - PbxqdH len=0 
' 0018     24 LABEL : Cell Value, String Constant - PePGGXjrs len=0 
' 0018     25 LABEL : Cell Value, String Constant - QVofuRkcBQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - QWeTwmHtagiJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - TZNnTOFf len=0 
' 0018     22 LABEL : Cell Value, String Constant - ufmxrcj len=0 
' 0018     26 LABEL : Cell Value, String Constant - vfdOzkjkbEr len=0 
' 0018     26 LABEL : Cell Value, String Constant - wXzyWfeaFCz len=0 
' 0018     24 LABEL : Cell Value, String Constant - XkgiYmDgD len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZTWIhxG 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)

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