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警惕!勒索病毒GandCrab 5.1来袭

警惕!GandCrab 5.1来袭。

本次发现的是GandCrab家族的最新版本GandCrab5.1。

一、入侵分析

文件加密时间为2019/1/22 4:22左右。排查日志发现,服务器在2019/1/224:11:54被远程登录过。该IP后面又分别在2019/1/22 4:32:45和2019/1/22 5:02:25再次登录该服务器。登录后,通过浏览器下载了勒索病毒体并进行勒索。

勒索完成后,再次通过浏览器下载内网扫描工具Advanced IP Scanner 2,试图勒索更多内网主机。

二、样本分析

1。相对于GandCrab之类的版本,GandCrab5。1版本同样采用了静态对抗反汇编的方法,阻止安全分析人员对样本进行静态分析,如下所示:

2.样本的勒索信息版本号变为了5.1,如下所示:

3.遍历进程,结束相关进程,如下所示:

相关的进程列表如下所示:

msftesql.exe、sqlagent.exe、sqlbrowser.exe、sqlwriter.exe、oracle.exe、ocssd.exe

dbsnmp.exe、synctime.exe、agntsvc.exeisqlplussvc.exe、xfssvccon.exe

sqlservr。exe、mydesktopservice。exe、ocautoupds。exe、agntsvc。exeagntsvc。exe

agntsvc。exeencsvc。exe、firefoxconfig。exe、tbirdconfig。exe、mydesktopqos。exe

ocomm.exe、mysqld.exe、mysqld-nt.exe、mysqld-opt.exe、dbeng50.exe

北京11选5sqbcoreservice.exe、excel.exe、infopath.exe、msaccess.exe、mspub.exe

onenote.exe、outlook.exe、powerpnt.exe、steam.exe、sqlservr.exe、thebat.exe

thebat64.exe、thunderbird.exe、visio.exe、winword.exe、wordpad.exe

4.创建互斥变量体,变量名Global\[随机字符串]+[.fuck],如下所示:

5.查询操作系统安装的输入法以及语言版本,GandCrab5.1版本同样增加了不对叙利亚地区的主机进行加密操作,如下所示:

当操作系统语言为如下国家时,则不进行加密,执行自删除操作,相应的国家列表如下:

419(LANG_RUSSIAN俄语) 422(LANG_UKRAINIAN乌克兰)

423(LANG_BELARUSIAN白俄罗斯) 428(LANG_TAJIK塔吉克)

42B(LANG_ARMENIAN亚美尼亚) 42C(阿塞拜疆,拉丁美洲(AZ))

437(LANG_GEORGIAN格鲁吉亚人) 43F(LANG_KAZAK哈萨克族)

440(LANG_KYRGYZ吉尔吉斯) 442(LANG_TURKMEN土库曼)

443(乌兹别克斯坦,拉丁语(UZ))444(LANG_TATAR俄罗斯(RU))

82C(LANG_AZERI阿塞拜疆,西里尔(亚利桑那州)) 843(LANG_UZBEK乌兹别克)

45A(叙利亚SYR)2801(叙利亚SY)

6.获取主机相关信息,如下所示:

获取的相关信息列表如下:

用户名

主机名

工作组

操作系统语言

操作系统键盘输入法

操作系统版本类型信息

CPU类型及型号信息

安全软件信息

磁盘类型及空间信息

北京11选5遍历主机上的安全软件,收集安全软件相关信息,相应的安全软件信息,如下所示:

北京11选5相应的安全软件列表信息,如下所示:

AVP.EXE、ekrn.exe、avgnt.exe、ashDisp.exe、NortonAntiBot.exe、Mcshield.exe

avengine.exe、cmdagent.exe、smc.exe、persfw.exe、pccpfw.exe、fsguiexe.exe

cfp.exe、msmpeng.exe

将收集到的信息,进行加密,加密过程,如下所示:

加密后的数据,如下所示:

北京11选57。 从内存中解密出RSA公钥信息,如下所示:

生成再通过微软的函数生成RSA公私钥对,如下所示:

生成的RSA的公私钥,并设置到相应的注册表,如下所示:

8.内存解密出勒索信息等字符串,如下所示:

9. 然后生成随机的加密后缀名,并转化为大写字母,如下所示:

10. 创建两个线程,分别遍历磁盘目录和共享目录文件夹下的文件进行加密,遍历磁盘目录,如下所示:

遍历共享目录文件,如下所示:

11. 从内存中解密出相应的加密文件后缀名列表以及相应的目录,如下所示:

相应的后缀名列表,如下所示:

rar zip cab arj lzh tar 7z gzip iso7-zip lzma vmx vmdk vmem vdi  vbox 1st602 doc xlm xlsx xlsm xltx xltm xlsb xla xlam xll xlw ppt pot pps pptx pptmpotx potm ppam ppsx ppsm sldx sldm xps xls xlt doc dotm docx abw act adoc aimans apkg apt asc asc ascii ase aty awp awt aww bad bbs bdp bdr bean bib bibbibtex bml bna boc brx btd bzabw cal ca charset chart chord cnm cod crwl cwscyi dca dfti dgs diz dne dot doc docm dotx docx doc xml docz dox dropbox dscdvi dwd dx dxb dxp eio eit emf eml emlx emulecollection epp err etf etx eucfadeintemplate faq fbl fcf fdffdr fds fdt fdx fdxt fft fgs flr fodt fountainfpt frt fwd fwdn gmd gpd gpn gsd gthr gv hbk hht hs hwp hwp hz idx iil ipfipspot jarvis jis jnp joe jp1 jrtf jtd kes klg knt kon kwd latex lbtlis lnt loglp2 lst lst ltr ltx lue luf lwp lxfml lyt lyx man mbox mcw md5 me mell mellelmin mnt msg mw mwd mwp nbndoc nfo ngloss njx note notes now nwctxt nwm nwp ocrodif odm odo odt ofl opeico openbsd ort ott p7s pages pages-tef pdpcmd pfx pjtplain plantumlpmo prt prt psw pu pvj pvm pwd pwdp pwdpl pwi pwr qdl qpf radreadme rft ris rpt rst rtd rtf rtfd rtx run rvf rzk rzn saf safetext sam samsave scc scm scriv scrivx sct scw sdm sdoc sdw se session sgm sig skcard slaslagzsmf sms ssa story strings stw sty sublime-project sublime-workspace sxgsxw tab tab tdf tdf template text textclipping thp tlb tm tmd tmdx tmv tmvx tpctrelby tvj txt u3i unauth unx uof uot upd utf8 utxt vct vntvw wbk webdoc wn wpwp4 wp5 wp6 wp7 wpa wpd wpd wpd wpl wps wpswpt wpt wpw wri wsd wtt wtx xbdoc xbplatexdl xdl xwp xwp xwp xyxy3 xyp xyw zabw zrtf zw ani cab cpl cur diagcab diagpkgdrv lock hlpldf icl icnsico ics lnk key idx mod mpa msc msp msstyles msunomedia ocx prf rom rtp scr shs spl sys theme

遍历磁盘如果为以下目录,则不加密文件,相应的目录列表,如下所示:

\ProgramData\

\IEIldCache\

\Boot\

\Program Files\

\Tor Browser\

\All Users\

北京11选5\Local Settings\

\Windows\

12. 遍历文件进行加密,如下所示:

加密后的文件,后缀为随机的后缀名,如下所示:

13. 加密之后,将之前获取的主机相关信息加密之后,上传到远程服务器,如下所示:

相应的远程服务器地址:

14.生成相应的勒索信息文本文件,如下所示:

GandCrab5.1来袭GandCrab5.1来袭

并设置勒索信息桌面背景图片,如下所示:

GandCrab5.1来袭

15。 打开相应的TOR网络地址,如下所示:

GandCrab5.1来袭

 

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