TROJ_UPATRE.YYSLO

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

It retrieves specific information from the affected system.

It deletes the initially executed copy of itself.

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan drops the following copies of itself into the affected system and executes them:

• %User Temp%\cmuxamaf.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 drops the following files:

• %User Temp%\tmpB7C3.inf - initially contains full malware path and filename, then it will be replaced by an encrypted data

(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.)

Other System Modifications

This Trojan adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion
kereruthjertr456 = "1"

Download Routine

This Trojan downloads the file from the following URL and renames the file when stored in the affected system:

• http://{BLOCKED}09.{BLOCKED}6.226.85:443/em12.png
• http://{BLOCKED}4.2{BLOCKED}0.92.193:443/em12.png
• http://{BLOCKED}76.{BLOCKED}6.251.208:443/em12.png
• http://{BLOCKED}88.{BLOCKED}55.165.154:443/em12.png
• http://{BLOCKED}73.{BLOCKED}16.240.56:443/em12.png
• http://{BLOCKED}9.1{BLOCKED}3.81.211:443/em12.png
• http://{BLOCKED}16.{BLOCKED}54.231.11:443/em12.png
• http://{BLOCKED}4.3{BLOCKED}.131.116:443/em12.png
• http://{BLOCKED}04.{BLOCKED}74.123.66:443/em12.png
• http://{BLOCKED}2.2{BLOCKED}0.82.80:443/em12.png
• http://{BLOCKED}4.2{BLOCKED}3.121.6:443/em12.png
• http://{BLOCKED}73.{BLOCKED}48.22.227:443/em12.png
• http://{BLOCKED}73.{BLOCKED}48.31.1:443/em12.png
• http://{BLOCKED}73.{BLOCKED}48.31.6:443/em12.png
• http://{BLOCKED}73.{BLOCKED}48.27.163:443/em12.png
• http://{BLOCKED}73.{BLOCKED}43.255.79:443/em12.png
• http://{BLOCKED}9.9{BLOCKED}204.114:443/em12.png
• http://{BLOCKED}3.1{BLOCKED}5.203.173:443/em12.png
• http://{BLOCKED}88.{BLOCKED}55.239.34:443/em12.png
• http://{BLOCKED}6.2{BLOCKED}.92.4:443/em12.png
• http://{BLOCKED}1.1{BLOCKED}4.36.73:443/em12.png
• http://{BLOCKED}8.2{BLOCKED}2.64.184:443/em12.png
• http://{BLOCKED}9.1{BLOCKED}4.171.44:443/em12.png
• http://{BLOCKED}5.3{BLOCKED}.236.173:443/em12.png
• http://{BLOCKED}6.1{BLOCKED}6.63.33:443/em12.png
• http://{BLOCKED}1.9{BLOCKED}.130.24:443/em12.png
• http://{BLOCKED}16.{BLOCKED}6.93.250:443/em12.png
• http://{BLOCKED}8.2{BLOCKED}6.210.27:443/em12.png
• http://{BLOCKED}6.1{BLOCKED}6.61.218:443/em12.png
• http://{BLOCKED}8.2{BLOCKED}4.11.253:443/em12.png
• http://{BLOCKED}4.1{BLOCKED}8.217.188:443/em12.png
• http://{BLOCKED}8.2{BLOCKED}9.75.164:443/em12.png
• http://{BLOCKED}6.1{BLOCKED}5.248.137:443/em12.png
• http://{BLOCKED}73.{BLOCKED}16.247.74:443/em12.png
• http://{BLOCKED}7.4{BLOCKED}.30.156:443/em12.png
• http://{BLOCKED}7.9{BLOCKED}.195.68:443/em12.png
• http://{BLOCKED}7.5{BLOCKED}.144.177:443/em12.png
• http://{BLOCKED}8.5{BLOCKED}.59.145:443/em12.png
• http://{BLOCKED}5.1{BLOCKED}3.141.50:443/em12.png
• http://{BLOCKED}88.{BLOCKED}55.243.105:443/em12.png
• http://{BLOCKED}5.1{BLOCKED}3.132.118:443/em12.png
• http://{BLOCKED}94.{BLOCKED}28.203.19:443/em12.png
• http://{BLOCKED}7.2{BLOCKED}9.142.189:443/em12.png
• http://{BLOCKED}5.1{BLOCKED}5.104.170:443/em12.png
• http://{BLOCKED}6.8{BLOCKED}.81.120:443/em12.png
• http://{BLOCKED}4.2{BLOCKED}6.161.47:443/em12.png
• http://{BLOCKED}17.{BLOCKED}68.210.122:443/em12.png
• http://{BLOCKED}1.9{BLOCKED}.175.7:443/em12.png
• http://{BLOCKED}2.2{BLOCKED}4.250.26:443/em12.png
• http://{BLOCKED}1.9{BLOCKED}.205.218:443/em12.png
• http://{BLOCKED}76.{BLOCKED}6.251.208:443/em12.png

It saves the files it downloads using the following names:

• %User Temp%\{random}.exe - detected as TSPY_DYRE.CX

(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.

Information Theft

This Trojan retrieves the following information from the affected system:

• Computer Name
• OS Version
• OS Service Pack

Other Details

This Trojan connects to the following URL(s) to get the affected system's IP address:

• icanhazip.com

It deletes the initially executed copy of itself

NOTES:

It connects to the following URLs to report infection of the affected system:

• http://{BLOCKED}3.{BLOCKED}85.4.90:{random port}/EM12/{Computer Name}/0/{OS}-{Service Pack}/0/{random value}