Analysis
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max time kernel
95s -
max time network
136s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
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submitted
21-11-2024 08:15
General
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Target
rnrwBsCuxDulkmr.exe
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Size
268KB
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MD5
55d0dadc4feb5873b80d1a61d7a8c622
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SHA1
afff011f61f629d240865389298f60465384f468
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SHA256
ed4e3a26d49cfdfce3c734d35bead1aef612614c1ec6ab7ce4110d936ec2e43c
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SHA512
1f3162c2dbf1bf040549986d256ba36c835bf8ab5aa22536cd50ae31a1c4385f1aac5412d935b2752be039ccdddb302f2e0e03edf192de67aca5a83abe0a2ce1
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SSDEEP
6144:n147gBGl86ggtZEvDQ9u7JaSBV+UdvrEFp7hKcR0:nmIGBggtZEvDQwJnBjvrEH7/R0
Malware Config
Signatures
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Floxif family
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Floxif, Floodfix
Floxif aka FloodFix is a file-changing trojan and backdoor written in C++.
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Detects Floxif payload 1 IoCs
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ACProtect 1.3x - 1.4x DLL software 1 IoCs
Detects file using ACProtect software.
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Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
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Loads dropped DLL 1 IoCs
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Enumerates connected drives 3 TTPs 1 IoCs
Attempts to read the root path of hard drives other than the default C: drive.
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UPX packed file 3 IoCs
Detects executables packed with UPX/modified UPX open source packer.
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Drops file in Program Files directory 2 IoCs
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Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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System Location Discovery: System Language Discovery 1 TTPs 2 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
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Modifies registry class 1 IoCs
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Opens file in notepad (likely ransom note) 1 IoCs
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Suspicious behavior: EnumeratesProcesses 4 IoCs
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Suspicious use of AdjustPrivilegeToken 1 IoCs
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Suspicious use of WriteProcessMemory 3 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\rnrwBsCuxDulkmr.exe"C:\Users\Admin\AppData\Local\Temp\rnrwBsCuxDulkmr.exe"1⤵
- Checks computer location settings
- Loads dropped DLL
- Enumerates connected drives
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\NOTEPAD.EXE"C:\Windows\system32\NOTEPAD.EXE" C:\HWID.txt2⤵
- System Location Discovery: System Language Discovery
- Opens file in notepad (likely ransom note)
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
271B
MD565e1c1ec3afbe627c1d30f5cb7784de4
SHA1a8a290d39e9b02ff728867a6b55dc8a972aba40f
SHA2562974582673b2c520d862d9472fca05c676544b67662df5b747105414d4355ea6
SHA512aaf2157209280d3d13cfa9cbee4f77558c82673279a76b20639627d2f182e7e90df9fbccaec574c78b37860303afac9917121a0246b1dc924b2ab164f607e73c
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Filesize
67KB
MD57574cf2c64f35161ab1292e2f532aabf
SHA114ba3fa927a06224dfe587014299e834def4644f
SHA256de055a89de246e629a8694bde18af2b1605e4b9b493c7e4aef669dd67acf5085
SHA5124db19f2d8d5bc1c7bbb812d3fa9c43b80fa22140b346d2760f090b73aed8a5177edb4bddc647a6ebd5a2db8565be5a1a36a602b0d759e38540d9a584ba5896ab
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Filesize
192KB
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Filesize
4KB
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Filesize
1.2MB
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Filesize
192KB