Analysis
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max time kernel
145s -
max time network
133s -
platform
windows10-2004_x64 -
resource
win10v2004-20230915-en -
resource tags
arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system -
submitted
11-10-2023 12:35
Static task
static1
Behavioral task
behavioral1
Sample
tmp.exe
Resource
win7-20230831-en
General
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Target
tmp.exe
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Size
3.1MB
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MD5
fdb8415567c0748a3bd4ffb9ac783cb7
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SHA1
dbc51b3b102a1fd0fffa2dd5d2809c6e385d6a82
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SHA256
92025c595d1a8e503aed2725ef9e64ef4ea919307c2694ffd564993ee4b64d43
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SHA512
4335ed11f768209edff90f4611b7ea9ec3ca40daa39eea98cd6cf62bf4a51e1d94d2aa3b3d42b51abb834d2954aaccf84006c6d2af3065b8f35f3b505f3674c2
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SSDEEP
98304:BE45G/DTclFuOqW6KGZKZhHRhZBiTdpU8:BE450QuO9xJZhHHic8
Malware Config
Signatures
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Downloads MZ/PE file
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Executes dropped EXE 2 IoCs
Processes:
bc4e-f706-b21d-dbf9mrupdsrv.exepid process 1720 bc4e-f706-b21d-dbf9 1228 mrupdsrv.exe -
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
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Processes:
tmp.exemrupdsrv.exedescription ioc process Key value queried \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA tmp.exe Key value queried \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA mrupdsrv.exe -
Drops file in System32 directory 1 IoCs
Processes:
mrupdsrv.exedescription ioc process File created C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Mail.Ru\Update Service\us\d9bf774acb mrupdsrv.exe -
Drops file in Program Files directory 2 IoCs
Processes:
bc4e-f706-b21d-dbf9description ioc process File created C:\Program Files (x86)\Mail.Ru\Update Service\mrupdsrv.exe bc4e-f706-b21d-dbf9 File opened for modification C:\Program Files (x86)\Mail.Ru\Update Service\mrupdsrv.exe bc4e-f706-b21d-dbf9 -
Processes:
tmp.exedescription ioc process Key created \REGISTRY\USER\S-1-5-21-1141987721-3945596982-3297311814-1000\Software\Microsoft\Internet Explorer\Main tmp.exe -
Suspicious behavior: EnumeratesProcesses 64 IoCs
Processes:
tmp.exemrupdsrv.exepid process 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 1228 mrupdsrv.exe 1228 mrupdsrv.exe 1228 mrupdsrv.exe 1228 mrupdsrv.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 1228 mrupdsrv.exe 1228 mrupdsrv.exe 1228 mrupdsrv.exe 1228 mrupdsrv.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe 3364 tmp.exe -
Suspicious use of WriteProcessMemory 3 IoCs
Processes:
tmp.exedescription pid process target process PID 3364 wrote to memory of 1720 3364 tmp.exe bc4e-f706-b21d-dbf9 PID 3364 wrote to memory of 1720 3364 tmp.exe bc4e-f706-b21d-dbf9 PID 3364 wrote to memory of 1720 3364 tmp.exe bc4e-f706-b21d-dbf9 -
System policy modification 1 TTPs 1 IoCs
Processes:
mrupdsrv.exedescription ioc process Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System mrupdsrv.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\tmp.exe"C:\Users\Admin\AppData\Local\Temp\tmp.exe"1⤵
- Checks whether UAC is enabled
- Modifies Internet Explorer settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\bc4e-f706-b21d-dbf9"C:\Users\Admin\AppData\Local\Temp\bc4e-f706-b21d-dbf9" --install2⤵
- Executes dropped EXE
- Drops file in Program Files directory
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C:\Program Files (x86)\Mail.Ru\Update Service\mrupdsrv.exe"C:\Program Files (x86)\Mail.Ru\Update Service\mrupdsrv.exe" --s1⤵
- Executes dropped EXE
- Checks whether UAC is enabled
- Drops file in System32 directory
- Suspicious behavior: EnumeratesProcesses
- System policy modification
Network
MITRE ATT&CK Matrix ATT&CK v13
Replay Monitor
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Downloads
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C:\Program Files (x86)\Mail.Ru\Update Service\mrupdsrv.exeFilesize
1.3MB
MD5602cd1f0dd54e83de1413705aa378803
SHA15015b921285a070a586be12c8663680a9e84dd2b
SHA2568eeef659d4d3e827474b4c769436807eafedf58dc923054338cb5385dc8d3998
SHA5125ba07ae618103ba84d7b4e10b15aa7f72fd42e80a5598f2ca361b4afe3ddce5c83dc44b64ba076020838f758a95dc2b148a9374155ff6c92d7d065355f657477
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C:\Program Files (x86)\Mail.Ru\Update Service\mrupdsrv.exeFilesize
1.3MB
MD5602cd1f0dd54e83de1413705aa378803
SHA15015b921285a070a586be12c8663680a9e84dd2b
SHA2568eeef659d4d3e827474b4c769436807eafedf58dc923054338cb5385dc8d3998
SHA5125ba07ae618103ba84d7b4e10b15aa7f72fd42e80a5598f2ca361b4afe3ddce5c83dc44b64ba076020838f758a95dc2b148a9374155ff6c92d7d065355f657477
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C:\ProgramData\Mail.Ru\IdFilesize
38B
MD5707dca884498a034604f3767eb28c731
SHA1941869e1da7aa394bcfe9f2a7a7e9dd592c1d819
SHA256e3cfae28e2f5db1345f3a4f8ab3d0af5056adc0c775bba22e0d49a297e9100b0
SHA51240f35623425e49c4ce34517a8d44f9a73ed2ba20ede3b275bcf00e4e9629ea2481300bbb14e7fa00630fd04c73fd1425297abd232184f25a812d5e43d32d6eb6
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C:\Users\Admin\AppData\Local\Temp\bc4e-f706-b21d-dbf9Filesize
1.3MB
MD5602cd1f0dd54e83de1413705aa378803
SHA15015b921285a070a586be12c8663680a9e84dd2b
SHA2568eeef659d4d3e827474b4c769436807eafedf58dc923054338cb5385dc8d3998
SHA5125ba07ae618103ba84d7b4e10b15aa7f72fd42e80a5598f2ca361b4afe3ddce5c83dc44b64ba076020838f758a95dc2b148a9374155ff6c92d7d065355f657477
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C:\Users\Admin\AppData\Local\Temp\bc4e-f706-b21d-dbf9Filesize
1.3MB
MD5602cd1f0dd54e83de1413705aa378803
SHA15015b921285a070a586be12c8663680a9e84dd2b
SHA2568eeef659d4d3e827474b4c769436807eafedf58dc923054338cb5385dc8d3998
SHA5125ba07ae618103ba84d7b4e10b15aa7f72fd42e80a5598f2ca361b4afe3ddce5c83dc44b64ba076020838f758a95dc2b148a9374155ff6c92d7d065355f657477