c41899315b2f3dad512ed1f58746e59fdb2f9717badcf7b2c861c1248d945991

Analysis

max time kernel
291s
max time network
119s
platform
windows7_x64
resource
win7-20240708-en
resource tags

arch:x64arch:x86image:win7-20240708-enlocale:en-usos:windows7-x64system
submitted
22-11-2024 03:21

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General

Target

csrss.ex_.exe
Size

892KB
MD5

d1217c81cca33f5fcc4bed6cd948a36b
SHA1

b1a299b2e29141618fd8ee1eba33f46dcbaa3f0a
SHA256

d460e5870a252c2827b88fdfc651a033a5d5875770f21a23b476a36e56ad5a8e
SHA512

bd63a2a187e5fba3691933b3eef02e86a09efd07d18c68dc1e372f9f848655ef4fffd930c5df6cc1f1ec10f66d424595c22866b74aa4d3688998c6c7013b897b
SSDEEP

24576:zdRpOBhPImfR23aAHRdY2Eq2htqgQdsmGDs2SZ:5R0BtoqAHnvEvhcVGDs

Score

6^/10

discovery persistence upx

Malware Config

Signatures

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3551809350-4263495960-1443967649-1000\Software\Microsoft\Windows\CurrentVersion\Run\Client Server Runtime Subsystem = "\"C:\\ProgramData\\Windows\\csrss.exe\""	csrss.ex_.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2492 set thread context of 1572	2492	csrss.ex_.exe	30

UPX packed file 40 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral17/memory/1572-11-0x0000000000400000-0x0000000001400000-memory.dmp	upx
behavioral17/memory/1572-5-0x0000000000400000-0x0000000001400000-memory.dmp	upx
behavioral17/memory/1572-14-0x0000000000400000-0x0000000001400000-memory.dmp	upx
behavioral17/memory/1572-9-0x0000000000400000-0x0000000001400000-memory.dmp	upx
behavioral17/memory/1572-6-0x0000000000400000-0x0000000001400000-memory.dmp	upx
behavioral17/memory/1572-16-0x0000000000400000-0x00000000005D5000-memory.dmp	upx
behavioral17/memory/1572-15-0x0000000000400000-0x0000000001400000-memory.dmp	upx
behavioral17/memory/1572-17-0x0000000000400000-0x0000000001400000-memory.dmp	upx
behavioral17/memory/1572-18-0x0000000000400000-0x0000000001400000-memory.dmp	upx
behavioral17/memory/1572-19-0x0000000000400000-0x0000000001400000-memory.dmp	upx
behavioral17/memory/1572-23-0x0000000000400000-0x00000000005D5000-memory.dmp	upx
behavioral17/memory/1572-24-0x0000000000400000-0x00000000005D5000-memory.dmp	upx
behavioral17/memory/1572-25-0x0000000000400000-0x00000000005D5000-memory.dmp	upx
behavioral17/memory/1572-26-0x0000000000400000-0x00000000005D5000-memory.dmp	upx
behavioral17/memory/1572-27-0x0000000000400000-0x00000000005D5000-memory.dmp	upx
behavioral17/memory/1572-28-0x0000000000400000-0x00000000005D5000-memory.dmp	upx
behavioral17/memory/1572-29-0x0000000000400000-0x00000000005D5000-memory.dmp	upx
behavioral17/memory/1572-32-0x0000000000400000-0x00000000005D5000-memory.dmp	upx
behavioral17/memory/1572-33-0x0000000000400000-0x00000000005D5000-memory.dmp	upx
behavioral17/memory/1572-34-0x0000000000400000-0x00000000005D5000-memory.dmp	upx
behavioral17/memory/1572-35-0x0000000000400000-0x00000000005D5000-memory.dmp	upx
behavioral17/memory/1572-36-0x0000000000400000-0x00000000005D5000-memory.dmp	upx
behavioral17/memory/1572-37-0x0000000000400000-0x00000000005D5000-memory.dmp	upx
behavioral17/memory/1572-38-0x0000000000400000-0x00000000005D5000-memory.dmp	upx
behavioral17/memory/1572-39-0x0000000000400000-0x00000000005D5000-memory.dmp	upx
behavioral17/memory/1572-40-0x0000000000400000-0x00000000005D5000-memory.dmp	upx
behavioral17/memory/1572-41-0x0000000000400000-0x00000000005D5000-memory.dmp	upx
behavioral17/memory/1572-42-0x0000000000400000-0x00000000005D5000-memory.dmp	upx
behavioral17/memory/1572-43-0x0000000000400000-0x00000000005D5000-memory.dmp	upx
behavioral17/memory/1572-44-0x0000000000400000-0x00000000005D5000-memory.dmp	upx
behavioral17/memory/1572-45-0x0000000000400000-0x00000000005D5000-memory.dmp	upx
behavioral17/memory/1572-46-0x0000000000400000-0x00000000005D5000-memory.dmp	upx
behavioral17/memory/1572-47-0x0000000000400000-0x00000000005D5000-memory.dmp	upx
behavioral17/memory/1572-48-0x0000000000400000-0x00000000005D5000-memory.dmp	upx
behavioral17/memory/1572-49-0x0000000000400000-0x00000000005D5000-memory.dmp	upx
behavioral17/memory/1572-50-0x0000000000400000-0x00000000005D5000-memory.dmp	upx
behavioral17/memory/1572-51-0x0000000000400000-0x00000000005D5000-memory.dmp	upx
behavioral17/memory/1572-52-0x0000000000400000-0x00000000005D5000-memory.dmp	upx
behavioral17/memory/1572-53-0x0000000000400000-0x00000000005D5000-memory.dmp	upx
behavioral17/memory/1572-54-0x0000000000400000-0x00000000005D5000-memory.dmp	upx

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

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.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	csrss.ex_.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	csrss.ex_.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2492	csrss.ex_.exe
1572	csrss.ex_.exe
1572	csrss.ex_.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2492	csrss.ex_.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 2492 wrote to memory of 1572	2492	csrss.ex_.exe	30
PID 2492 wrote to memory of 1572	2492	csrss.ex_.exe	30
PID 2492 wrote to memory of 1572	2492	csrss.ex_.exe	30
PID 2492 wrote to memory of 1572	2492	csrss.ex_.exe	30
PID 2492 wrote to memory of 1572	2492	csrss.ex_.exe	30
PID 2492 wrote to memory of 1572	2492	csrss.ex_.exe	30
PID 2492 wrote to memory of 1572	2492	csrss.ex_.exe	30
PID 2492 wrote to memory of 1572	2492	csrss.ex_.exe	30
PID 2492 wrote to memory of 1572	2492	csrss.ex_.exe	30
PID 2492 wrote to memory of 1572	2492	csrss.ex_.exe	30
PID 2492 wrote to memory of 1572	2492	csrss.ex_.exe	30

C:\Users\Admin\AppData\Local\Temp\csrss.ex_.exe
"C:\Users\Admin\AppData\Local\Temp\csrss.ex_.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2492
- C:\Users\Admin\AppData\Local\Temp\csrss.ex_.exe
  C:\Users\Admin\AppData\Local\Temp\csrss.ex_.exe
  2⤵
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  PID:1572

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

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/1572-33-0x0000000000400000-0x00000000005D5000-memory.dmp

Filesize
1.8MB

Download
memory/1572-5-0x0000000000400000-0x0000000001400000-memory.dmp

Filesize
16.0MB

Download
memory/1572-11-0x0000000000400000-0x0000000001400000-memory.dmp

Filesize
16.0MB

Download
memory/1572-32-0x0000000000400000-0x00000000005D5000-memory.dmp

Filesize
1.8MB

Download
memory/1572-2-0x0000000000400000-0x0000000001400000-memory.dmp

Filesize
16.0MB

Download
memory/1572-14-0x0000000000400000-0x0000000001400000-memory.dmp

Filesize
16.0MB

Download
memory/1572-12-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/1572-9-0x0000000000400000-0x0000000001400000-memory.dmp

Filesize
16.0MB

Download
memory/1572-6-0x0000000000400000-0x0000000001400000-memory.dmp

Filesize
16.0MB

Download
memory/1572-16-0x0000000000400000-0x00000000005D5000-memory.dmp

Filesize
1.8MB

Download
memory/1572-29-0x0000000000400000-0x00000000005D5000-memory.dmp

Filesize
1.8MB

Download
memory/1572-17-0x0000000000400000-0x0000000001400000-memory.dmp

Filesize
16.0MB

Download
memory/1572-54-0x0000000000400000-0x00000000005D5000-memory.dmp

Filesize
1.8MB

Download
memory/1572-19-0x0000000000400000-0x0000000001400000-memory.dmp

Filesize
16.0MB

Download
memory/1572-23-0x0000000000400000-0x00000000005D5000-memory.dmp

Filesize
1.8MB

Download
memory/1572-24-0x0000000000400000-0x00000000005D5000-memory.dmp

Filesize
1.8MB

Download
memory/1572-25-0x0000000000400000-0x00000000005D5000-memory.dmp

Filesize
1.8MB

Download
memory/1572-26-0x0000000000400000-0x00000000005D5000-memory.dmp

Filesize
1.8MB

Download
memory/1572-27-0x0000000000400000-0x00000000005D5000-memory.dmp

Filesize
1.8MB

Download
memory/1572-28-0x0000000000400000-0x00000000005D5000-memory.dmp

Filesize
1.8MB

Download
memory/1572-15-0x0000000000400000-0x0000000001400000-memory.dmp

Filesize
16.0MB

Download
memory/1572-1-0x0000000000300000-0x0000000000400000-memory.dmp

Filesize
1024KB

Download
memory/1572-18-0x0000000000400000-0x0000000001400000-memory.dmp

Filesize
16.0MB

Download
memory/1572-34-0x0000000000400000-0x00000000005D5000-memory.dmp

Filesize
1.8MB

Download
memory/1572-35-0x0000000000400000-0x00000000005D5000-memory.dmp

Filesize
1.8MB

Download
memory/1572-36-0x0000000000400000-0x00000000005D5000-memory.dmp

Filesize
1.8MB

Download
memory/1572-37-0x0000000000400000-0x00000000005D5000-memory.dmp

Filesize
1.8MB

Download
memory/1572-38-0x0000000000400000-0x00000000005D5000-memory.dmp

Filesize
1.8MB

Download
memory/1572-39-0x0000000000400000-0x00000000005D5000-memory.dmp

Filesize
1.8MB

Download
memory/1572-40-0x0000000000400000-0x00000000005D5000-memory.dmp

Filesize
1.8MB

Download
memory/1572-41-0x0000000000400000-0x00000000005D5000-memory.dmp

Filesize
1.8MB

Download
memory/1572-42-0x0000000000400000-0x00000000005D5000-memory.dmp

Filesize
1.8MB

Download
memory/1572-43-0x0000000000400000-0x00000000005D5000-memory.dmp

Filesize
1.8MB

Download
memory/1572-44-0x0000000000400000-0x00000000005D5000-memory.dmp

Filesize
1.8MB

Download
memory/1572-45-0x0000000000400000-0x00000000005D5000-memory.dmp

Filesize
1.8MB

Download
memory/1572-46-0x0000000000400000-0x00000000005D5000-memory.dmp

Filesize
1.8MB

Download
memory/1572-47-0x0000000000400000-0x00000000005D5000-memory.dmp

Filesize
1.8MB

Download
memory/1572-48-0x0000000000400000-0x00000000005D5000-memory.dmp

Filesize
1.8MB

Download
memory/1572-49-0x0000000000400000-0x00000000005D5000-memory.dmp

Filesize
1.8MB

Download
memory/1572-50-0x0000000000400000-0x00000000005D5000-memory.dmp

Filesize
1.8MB

Download
memory/1572-51-0x0000000000400000-0x00000000005D5000-memory.dmp

Filesize
1.8MB

Download
memory/1572-52-0x0000000000400000-0x00000000005D5000-memory.dmp

Filesize
1.8MB

Download
memory/1572-53-0x0000000000400000-0x00000000005D5000-memory.dmp

Filesize
1.8MB

Download
memory/2492-0-0x0000000000380000-0x0000000000385000-memory.dmp

Filesize
20KB

Download