f2c8e08a046778ff481b571e0be85023294c1713df19204572c0bce6b480687f

Analysis

max time kernel
66s
max time network
54s
platform
windows10-2004_x64
resource
win10v2004-20240419-en
resource tags

arch:x64arch:x86image:win10v2004-20240419-enlocale:en-usos:windows10-2004-x64system
submitted
28-04-2024 10:15

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General

Target

2024-04-28_c145cef12afd543f7d51bac766ac11d5_bkransomware.exe
Size

96KB
MD5

c145cef12afd543f7d51bac766ac11d5
SHA1

1b40c5a74b213611c5e53e7b9b81ac4ffd0b1e0d
SHA256

f2c8e08a046778ff481b571e0be85023294c1713df19204572c0bce6b480687f
SHA512

804e8ea036c3d83b7dc875f24bbc5ef57c0d3e1a502576bd359704a25f7f1671924918bf66b3c0cf90de80a516a600bb5d2631523df91cf2b15c43a66b3ca07c
SSDEEP

1536:Fc897UsWjcd9w+AyabjDbxE+MwmvlDuazTJFrFSrwy+L6yQlD+Usz8El4Pf8:ZhpAyazIlyazTtSrwy+sYldiM

Score

7^/10

persistence spyware stealer

Malware Config

Signatures

Executes dropped EXE 2 IoCs

Processes:

uwmAs4CHmnBrIIz.exeCTS.exe

pid process

4588 uwmAs4CHmnBrIIz.exe
4340 CTS.exe
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

pid	process
4588	uwmAs4CHmnBrIIz.exe
4340	CTS.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

2024-04-28_c145cef12afd543f7d51bac766ac11d5_bkransomware.exeCTS.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe"	2024-04-28_c145cef12afd543f7d51bac766ac11d5_bkransomware.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe"	CTS.exe

Drops file in Windows directory 2 IoCs

Processes:

2024-04-28_c145cef12afd543f7d51bac766ac11d5_bkransomware.exeCTS.exe

description ioc process

File created C:\Windows\CTS.exe 2024-04-28_c145cef12afd543f7d51bac766ac11d5_bkransomware.exe
File created C:\Windows\CTS.exe CTS.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

2024-04-28_c145cef12afd543f7d51bac766ac11d5_bkransomware.exeCTS.exe

description pid process

Token: SeDebugPrivilege 5004 2024-04-28_c145cef12afd543f7d51bac766ac11d5_bkransomware.exe
Token: SeDebugPrivilege 4340 CTS.exe

description	ioc	process
File created	C:\Windows\CTS.exe	2024-04-28_c145cef12afd543f7d51bac766ac11d5_bkransomware.exe
File created	C:\Windows\CTS.exe	CTS.exe

description	pid	process
Token: SeDebugPrivilege	5004	2024-04-28_c145cef12afd543f7d51bac766ac11d5_bkransomware.exe
Token: SeDebugPrivilege	4340	CTS.exe

Suspicious use of WriteProcessMemory 5 IoCs

Processes:

2024-04-28_c145cef12afd543f7d51bac766ac11d5_bkransomware.exe

description	pid	process	target process
PID 5004 wrote to memory of 4588	5004	2024-04-28_c145cef12afd543f7d51bac766ac11d5_bkransomware.exe	uwmAs4CHmnBrIIz.exe
PID 5004 wrote to memory of 4588	5004	2024-04-28_c145cef12afd543f7d51bac766ac11d5_bkransomware.exe	uwmAs4CHmnBrIIz.exe
PID 5004 wrote to memory of 4340	5004	2024-04-28_c145cef12afd543f7d51bac766ac11d5_bkransomware.exe	CTS.exe
PID 5004 wrote to memory of 4340	5004	2024-04-28_c145cef12afd543f7d51bac766ac11d5_bkransomware.exe	CTS.exe
PID 5004 wrote to memory of 4340	5004	2024-04-28_c145cef12afd543f7d51bac766ac11d5_bkransomware.exe	CTS.exe

C:\Users\Admin\AppData\Local\Temp\2024-04-28_c145cef12afd543f7d51bac766ac11d5_bkransomware.exe
"C:\Users\Admin\AppData\Local\Temp\2024-04-28_c145cef12afd543f7d51bac766ac11d5_bkransomware.exe"
1⤵
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5004

C:\Users\Admin\AppData\Local\Temp\uwmAs4CHmnBrIIz.exe
C:\Users\Admin\AppData\Local\Temp\uwmAs4CHmnBrIIz.exe
2⤵
- Executes dropped EXE
PID:4588

C:\Windows\CTS.exe
"C:\Windows\CTS.exe"
2⤵
- Executes dropped EXE
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
PID:4340

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Lateral Movement

Collection

Data from Local System

T1005

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\Office\16.0\excel.exe_Rules.xml
Filesize
392KB

MD5
8d6910e6115f183a14e4bcf68fd91bb1

SHA1
f269aa8c5aa8a86d2f1bb6af93751356107944bc

SHA256
ad968c8e326f96af917eb9bcc20320f262381fbdff1729c904e0543ba5f91c29

SHA512
fb21c2008b114036c1d9cc02c8eb241bcd39dc51732f40de4ad4f234c565069b45056c26ffc8a534233615bd30ff7632db9f68463f46c12b98271f693a7cd8f2

Download Submit
C:\Users\Admin\AppData\Local\Temp\uwmAs4CHmnBrIIz.exe
Filesize
25KB

MD5
abbd49c180a2f8703f6306d6fa731fdc

SHA1
d63f4bfe7f74936b2fbace803e3da6103fbf6586

SHA256
5f411c0bd9ed9a42b0f07ed568c7d0cf358a83063b225a1f8f7da3296dde90f1

SHA512
290dd984acc451b778f3db8c510bae7aec1d9547c3ad0a1829df731c136e4ecc9a37dc6a786cf8f1ecc4d14339aed1288af25055f450f6f953138c8d4d5c36e9

Download Submit
C:\Windows\CTS.exe
Filesize
71KB

MD5
66df4ffab62e674af2e75b163563fc0b

SHA1
dec8a197312e41eeb3cfef01cb2a443f0205cd6e

SHA256
075a6eecd8da1795532318f9cf880efe42461f9464d63f74deb271d33110f163

SHA512
1588dd78e6e8972013c40cdb6acfb84c8df7b081197233ce621904b645356c805d0424bb93dd46c55834dc47d9ff39ee1323cf8e670841b3fff24ab98ba87f25

Download Submit
memory/4588-15-0x0000000000400000-0x000000000040D000-memory.dmp

Filesize
52KB

Download