Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8ffd1fcb753069a1…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:46:57 Authoring application: Microsoft Excel First seen: 2021-06-28
MD5: 5e6f5c58f2d610124837b94e35716b02 SHA-1: 584ecbf3e8449703f7d0425307cb1ff3f7dca8ad SHA-256: 8ffd1fcb753069a108d3a359514927335764b9c76e446aeb1815de90508966fe
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open function, which is a known method for executing malicious code. The macro sheet contains a defined name for Auto_Open, suggesting an attempt to automatically run code upon opening the workbook. This pattern is commonly used to download and execute further stages of malware.

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) 6900 bytes
SHA-256: 2586016dbf4cb649bef59db8d12753b2b3e7a6f7d547aaddde461ef0ea4b3b5e
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 -  ZSuohdOzcE
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B129 
' 0018     22 LABEL : Cell Value, String Constant - bYieVNH len=0 
' 0018     25 LABEL : Cell Value, String Constant - eesaisKZfE len=0 
' 0018     22 LABEL : Cell Value, String Constant - GhMUJCh len=0 
' 0018     21 LABEL : Cell Value, String Constant - gPEejh len=0 
' 0018     26 LABEL : Cell Value, String Constant - GZBqIypPEsm len=0 
' 0018     27 LABEL : Cell Value, String Constant - iieEjVkIhnuE len=0 
' 0018     27 LABEL : Cell Value, String Constant - jOSSfHuyZfij len=0 
' 0018     23 LABEL : Cell Value, String Constant - kgsJNpPq len=0 
' 0018     20 LABEL : Cell Value, String Constant - Kzlkv len=0 
' 0018     24 LABEL : Cell Value, String Constant - lLDglFKeB len=0 
' 0018     23 LABEL : Cell Value, String Constant - MsTTOrKQ len=0 
' 0018     22 LABEL : Cell Value, String Constant - nTiRubb len=0 
' 0018     26 LABEL : Cell Value, String Constant - OmRWZpLCsDP len=0 
' 0018     25 LABEL : Cell Value, String Constant - owZLcchZHk len=0 
' 0018     21 LABEL : Cell Value, String Constant - qGMQgB len=0 
' 0018     21 LABEL : Cell Value, String Constant - QoRLQn len=0 
' 0018     23 LABEL : Cell Value, String Constant - sYSctgNY len=0 
' 0018     24 LABEL : Cell Value, String Constant - VRxEWqzVp len=0 
' 0018     23 LABEL : Cell Value, String Constant - WevDbGEQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - wLwYyDECoKkj 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
' 00
... (truncated)

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