ADW_CHINDO
a variant of Win32/RiskWare.Chindo.I (ESET)
Windows
Threat Type: Adware
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
This adware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It downloads a file from a certain URL then renames it before storing it in the affected system. It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.
It terminates itself if it detects it is being run in a virtual environment.
TECHNICAL DETAILS
Arrival Details
This adware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Download Routine
This adware downloads files from the following URLs then renames them before storage in the affected system:
- ww2.{BLOCKED}g.cn/large/{random characters}.jpg
- ww4.{BLOCKED}g.cn/large/{random characters}.jpg
- ww3.{BLOCKED}g.cn/large/{random characters}.jpg
It saves the files it downloads using the following names:
- %User Temp%\1a.dat.jpg
- %User Temp%\b2.dat.jpg
- %User Temp%\6765.dat.jpg
- %User Temp%\865.dat.jpg
- %User Temp%\324.dat.jpg
- %User Temp%\3fswef.dat.jpg
- %User Temp%\5675.dd.jpg
- %User Temp%\7675.dd.jpg
- %User Temp%\3675.aa.jpg
- %User Temp%\325c.tye.jpg
- %User Temp%\d543.tyre.jpg
- %User Temp%\f543.tyre.jpg
- %User Temp%\87k.tye.jpg
- %User Temp%\l897.tye.jpg
- %User Temp%\4675.tyer.jpg
- %User Temp%\10.tyer.jpg
- %User Temp%\12.trey.jpg
- %User Temp%\1654.88.jpg
- %User Temp%\16756.dfsa.jpg
- %User Temp%\e453ert.zip.jpg
- %User Temp%\gr.zip.jpg
- %User Temp%\hetyw.zip.jpg
- %User Temp%\i97.zytreip.jpg
- %User Temp%\j987.zip.jpg
- %User Temp%\Happy88_B008_10008.exe
- %User Temp%\V8._90274_20150708135043.exe
- %User Temp%\KeLe2014Beta3.6.2Promote0714_20090195130.exe
- %User Temp%\setup_30049.exe R2AaFYc 325c.tye
- %User Temp%\tbbrzfqhpq_1202000058.exe
- %User Temp%\SoHuVA_4.2.0.16-c204900003-ng-nti-tp-s-x.exe
- %User Temp%\R2ZWjsD e453ert.zip 2345Explorer_329241_silence.exe RLAcowy f543.tyre
- %User Temp%\jabvst.exe
- %User Temp%\ztzjiklit_133_setup.exe RL5s6z0 hetyw.zip
- %User Temp%\Baidu_Com_90000353.exe
- %User Temp%\rmv1400617.exe
- %User Temp%\RL5Zk4z 87k.tye QQPCDownload45116.exe
- %User Temp%\kinst_1_329.exe RL5ZF1k m897.yter
- %User Temp%\RLq0ReF 3675.aa tbbrzfqhpq_1202000031.exe
- %User Temp%\install1078565.exe
- %User Temp%\Baidu_Com_90000353.exe
- %User Temp%\tnemh.exe
- %User Temp%\Baidu_Com_90000357.exe
- %User Temp%\Baidu_Com_90000358.exe
- %User Temp%\lzlww_31200.exe
- %User Temp%\F0703_s_31245.exe
- %User Temp%\wzjtp_71286.exe
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.
Other Details
This adware terminates itself if it detects it is being run in a virtual environment.
NOTES:
It checks for the following registry to check if it is being run in a Virtual Machine:
- HKEY_LOCAL_MACHINE\SOFTWARE\VMware,Inc.
SOLUTION
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 3
Search and delete these files
- %User Temp%\1a.dat.jpg
- %User Temp%\b2.dat.jpg
- %User Temp%\6765.dat.jpg
- %User Temp%\865.dat.jpg
- %User Temp%\324.dat.jpg
- %User Temp%\3fswef.dat.jpg
- %User Temp%\5675.dd.jpg
- %User Temp%\7675.dd.jpg
- %User Temp%\3675.aa.jpg
- %User Temp%\325c.tye.jpg
- %User Temp%\d543.tyre.jpg
- %User Temp%\f543.tyre.jpg
- %User Temp%\87k.tye.jpg
- %User Temp%\l897.tye.jpg
- %User Temp%\4675.tyer.jpg
- %User Temp%\10.tyer.jpg
- %User Temp%\12.trey.jpg
- %User Temp%\1654.88.jpg
- %User Temp%\16756.dfsa.jpg
- %User Temp%\e453ert.zip.jpg
- %User Temp%\gr.zip.jpg
- %User Temp%\hetyw.zip.jpg
- %User Temp%\i97.zytreip.jpg
- %User Temp%\j987.zip.jpg
- %User Temp%\Happy88_B008_10008.exe
- %User Temp%\V8._90274_20150708135043.exe
- %User Temp%\KeLe2014Beta3.6.2Promote0714_20090195130.exe
- %User Temp%\setup_30049.exe R2AaFYc 325c.tye
- %User Temp%\tbbrzfqhpq_1202000058.exe
- %User Temp%\SoHuVA_4.2.0.16-c204900003-ng-nti-tp-s-x.exe
- %User Temp%\R2ZWjsD e453ert.zip 2345Explorer_329241_silence.exe RLAcowy f543.tyre
- %User Temp%\jabvst.exe
- %User Temp%\ztzjiklit_133_setup.exe RL5s6z0 hetyw.zip
- %User Temp%\Baidu_Com_90000353.exe
- %User Temp%\rmv1400617.exe
- %User Temp%\RL5Zk4z 87k.tye QQPCDownload45116.exe
- %User Temp%\kinst_1_329.exe RL5ZF1k m897.yter
- %User Temp%\RLq0ReF 3675.aa tbbrzfqhpq_1202000031.exe
- %User Temp%\install1078565.exe
- %User Temp%\Baidu_Com_90000353.exe
- %User Temp%\tnemh.exe
- %User Temp%\Baidu_Com_90000357.exe
- %User Temp%\Baidu_Com_90000358.exe
- %User Temp%\lzlww_31200.exe
- %User Temp%\F0703_s_31245.exe
- %User Temp%\wzjtp_71286.exe
Step 4
Scan your computer with your Trend Micro product to delete files detected as ADW_CHINDO. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.
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