Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 13db46693a1a5cc0…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:38 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 8a986fad8058a6fec7370f8396ea468b SHA-1: 65d474cea792a064fc8631ea7cf90a3d74e59795 SHA-256: 13db46693a1a5cc04aabdccacf3eaafd24324eb89711c4db2b4d3270254daf67
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 (XLM) macros, specifically an Auto_Open defined name, which is a critical finding. This indicates the macro sheet is designed to automatically execute code upon opening. The presence of dangerous formula APIs like RUN further confirms the intent to execute arbitrary code, likely leading to the download and execution of 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) 6607 bytes
SHA-256: bbbb6fbf13301a771fff8d43a97eebf29119a99a98b75a7cee790fd9aaf4e899
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 -  ElZiZCIlbz
' 0018     26 LABEL : Cell Value, String Constant - AtttemSqidp len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D159 
' 0018     21 LABEL : Cell Value, String Constant - BfotWi len=0 
' 0018     25 LABEL : Cell Value, String Constant - BwlKrlkOml len=0 
' 0018     26 LABEL : Cell Value, String Constant - CdyxmcLIdET len=0 
' 0018     20 LABEL : Cell Value, String Constant - fqNvi len=0 
' 0018     21 LABEL : Cell Value, String Constant - iaLsBS len=0 
' 0018     24 LABEL : Cell Value, String Constant - IpdKVDFvn len=0 
' 0018     21 LABEL : Cell Value, String Constant - KsQmGK len=0 
' 0018     22 LABEL : Cell Value, String Constant - LDyumDl len=0 
' 0018     20 LABEL : Cell Value, String Constant - MMsGE len=0 
' 0018     23 LABEL : Cell Value, String Constant - NxjfmBFe len=0 
' 0018     26 LABEL : Cell Value, String Constant - oHmldPTAHsA len=0 
' 0018     25 LABEL : Cell Value, String Constant - PvyYDMWRxR len=0 
' 0018     25 LABEL : Cell Value, String Constant - pxkJdAFJpB len=0 
' 0018     25 LABEL : Cell Value, String Constant - sBobPdiOii len=0 
' 0018     23 LABEL : Cell Value, String Constant - usOwKApE len=0 
' 0018     26 LABEL : Cell Value, String Constant - vNhPxBsJGzX len=0 
' 0018     24 LABEL : Cell Value, String Constant - XXnljCSbI len=0 
' 0018     22 LABEL : Cell Value, String Constant - YTGYgcx len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZFvnecHFZg 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)

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