f937e9d130ac212349423163bd2eb0417cadc6cfafb8bdef07e3ab27b1daa5b3

Analysis

max time kernel
143s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
25/05/2024, 02:38

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General

Target
2024-05-25_4df61d2c355d7f254cf8f88f95632ef7_bkransomware.exe
Size 71KB
Sample240525-c4y7lsbf4s
SHA256 f937e9d130ac212349423163bd2eb0417cadc6cfafb8bdef07e3ab27b1daa5b3
MD5 4df61d2c355d7f254cf8f88f95632ef7
SHA1 3a70a9731af9d6d20d4404da2d149665f6648555
SHA512 ceb5f8390f47a19916cae4f269f518d0a2f642b345fa39b28584f1f162c9d5e0d331ff7887071d7a10ac9fb3dc42a3aa4cf5ad406504c6ddf4123b493936b26d
SSDEEP 1536:Fc8N7UsWjcd9w+AyabjDbxE+MwmvlzuazTU:ZRpAyazIliazTU
MD5 SHA1 SHA512 SSDEEP

Score

7^/10

persistence spyware stealer

Malware Config

Signatures

Executes dropped EXE 1 IoCs

pid	Process
4996	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

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe"	2024-05-25_4df61d2c355d7f254cf8f88f95632ef7_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

description	ioc	Process
File created	C:\Windows\CTS.exe	2024-05-25_4df61d2c355d7f254cf8f88f95632ef7_bkransomware.exe
File created	C:\Windows\CTS.exe	CTS.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1500	2024-05-25_4df61d2c355d7f254cf8f88f95632ef7_bkransomware.exe
Token: SeDebugPrivilege	4996	CTS.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 1500 wrote to memory of 4996	1500	2024-05-25_4df61d2c355d7f254cf8f88f95632ef7_bkransomware.exe	89
PID 1500 wrote to memory of 4996	1500	2024-05-25_4df61d2c355d7f254cf8f88f95632ef7_bkransomware.exe	89
PID 1500 wrote to memory of 4996	1500	2024-05-25_4df61d2c355d7f254cf8f88f95632ef7_bkransomware.exe	89

C:\Users\Admin\AppData\Local\Temp\2024-05-25_4df61d2c355d7f254cf8f88f95632ef7_bkransomware.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-25_4df61d2c355d7f254cf8f88f95632ef7_bkransomware.exe"
1⤵
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1500
- 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:4996

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=3808 --field-trial-handle=2264,i,15001568551143786084,90255922961447677,262144 --variations-seed-version /prefetch:8
1⤵
PID:1972

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

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

Command and Control

Exfiltration

Impact

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Downloads

excel.exe_Rules.xml

Path C:\Users\Admin\AppData\Local\Microsoft\Office\16.0\excel.exe_Rules.xml
Size 789KB
SHA256 bb31fe2f33bcdb26b575eb6933c52818ff9f16480b763a1ba07966f3150e3c29
MD5 ab8d992c5561a3bd45866b8d92ed8725
SHA1 d0dab5b9d52e840547200bf9df3a888d060c94d9
SHA512 eecafc4c400165eda6a19bd6ba2028370c14ac161861686bea01333a25c3478e13f9f365eafc5c0780c85635e891aba886a10e4962b9fdd8c685ed4e50837e53
SSDEEP 24576:DNZ/mRbYzV1iR4VP4xJIInhFkSg8jOXaM:DSRYAcQxFhFDjDM
MD5 SHA1 SHA512 SSDEEP

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rgQ0yPTWIWdnonw.exe

Path C:\Users\Admin\AppData\Local\Temp\rgQ0yPTWIWdnonw.exe
Size 71KB
SHA256 0512fd285a4018d3507dee2ff28068c4c63ebe65126efc1050d0bcd264954e6c
MD5 5d47b071de9a394d71b406cf8ee68053
SHA1 e3e7871b908ea75517287b612c5e063f361b1b59
SHA512 0996e7f375f8d5843d46f3608bb8a56cf4712250a472245f0a535497a20c863f32996a89a00d461d0f120ce9236e388a2c9da911df0edef38948d3ab753d0381
SSDEEP 1536:Fc8N7UsWjcd9w+AyabjDbxE+MwmvlzuazTN:ZRpAyazIliazTN
MD5 SHA1 SHA512 SSDEEP

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CTS.exe

Path C:\Windows\CTS.exe
Size 71KB
SHA256 b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc
MD5 f9d4ab0a726adc9b5e4b7d7b724912f1
SHA1 3d42ca2098475924f70ee4a831c4f003b4682328
SHA512 22a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432
SSDEEP 1536:Fc8N7UsWjcd9w+AyabjDbxE+MwmvlzuazT:ZRpAyazIliazT
MD5 SHA1 SHA512 SSDEEP

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads