ffb4e96f08c611fbd3811e3607ab90e1847147a3f604e9e5dfbcc515a10c215c

General

Target

ffb4e96f08c611fbd3811e3607ab90e1847147a3f604e9e5dfbcc515a10c215c.exe
Size

139KB
MD5

42eb394ea1002c0a3c769c67f111eb02
SHA1

6fc812af321a4019692ed3f12c56d34dd2e71bc5
SHA256

ffb4e96f08c611fbd3811e3607ab90e1847147a3f604e9e5dfbcc515a10c215c
SHA512

3fefc004ccb923f4f6c4dfd9163aff75d6fa9dd13baea9654eb861cc0c358a9802c510dd63f7129d453c4e6eb7b6bb5e4ce155667a3e24283a67417d6333216d
SSDEEP

1536:r4BG/etj/YfPxlvLPwa4csqZh8lD1SL36/dvFBoa1EHhzLkH1op7jF3iHSPjJ:rl3XYa4vgh8hCQdvMaQ+Yj

Score

8^/10

Malware Config

Signatures

Executes dropped EXE 1 IoCs

pid	Process
1792	csrss.exe

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Modify Existing Service

T1031

pid	Process
1108	netsh.exe

Drops startup file 2 IoCs

description	ioc	Process
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\e101a39ab5de59589562aa0ff3295ba5.exe	csrss.exe
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\e101a39ab5de59589562aa0ff3295ba5.exe	csrss.exe

Loads dropped DLL 1 IoCs

pid	Process
1148	ffb4e96f08c611fbd3811e3607ab90e1847147a3f604e9e5dfbcc515a10c215c.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000\Software\Microsoft\Windows\CurrentVersion\Run\e101a39ab5de59589562aa0ff3295ba5 = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\csrss.exe\" .."	csrss.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\e101a39ab5de59589562aa0ff3295ba5 = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\csrss.exe\" .."	csrss.exe

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1792	csrss.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1792	csrss.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1148 wrote to memory of 1792	1148	ffb4e96f08c611fbd3811e3607ab90e1847147a3f604e9e5dfbcc515a10c215c.exe	27
PID 1148 wrote to memory of 1792	1148	ffb4e96f08c611fbd3811e3607ab90e1847147a3f604e9e5dfbcc515a10c215c.exe	27
PID 1148 wrote to memory of 1792	1148	ffb4e96f08c611fbd3811e3607ab90e1847147a3f604e9e5dfbcc515a10c215c.exe	27
PID 1148 wrote to memory of 1792	1148	ffb4e96f08c611fbd3811e3607ab90e1847147a3f604e9e5dfbcc515a10c215c.exe	27
PID 1792 wrote to memory of 1108	1792	csrss.exe	28
PID 1792 wrote to memory of 1108	1792	csrss.exe	28
PID 1792 wrote to memory of 1108	1792	csrss.exe	28
PID 1792 wrote to memory of 1108	1792	csrss.exe	28

C:\Users\Admin\AppData\Local\Temp\ffb4e96f08c611fbd3811e3607ab90e1847147a3f604e9e5dfbcc515a10c215c.exe
"C:\Users\Admin\AppData\Local\Temp\ffb4e96f08c611fbd3811e3607ab90e1847147a3f604e9e5dfbcc515a10c215c.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1148
- C:\Users\Admin\AppData\Local\Temp\csrss.exe
  "C:\Users\Admin\AppData\Local\Temp\csrss.exe"
  2⤵
  - Executes dropped EXE
  - Drops startup file
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1792
- - C:\Windows\SysWOW64\netsh.exe
    netsh firewall add allowedprogram "C:\Users\Admin\AppData\Local\Temp\csrss.exe" "csrss.exe" ENABLE
    3⤵
    - Modifies Windows Firewall
    PID:1108

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Modify Existing Service

1

T1031

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\csrss.exe

Filesize
139KB

MD5
42eb394ea1002c0a3c769c67f111eb02

SHA1
6fc812af321a4019692ed3f12c56d34dd2e71bc5

SHA256
ffb4e96f08c611fbd3811e3607ab90e1847147a3f604e9e5dfbcc515a10c215c

SHA512
3fefc004ccb923f4f6c4dfd9163aff75d6fa9dd13baea9654eb861cc0c358a9802c510dd63f7129d453c4e6eb7b6bb5e4ce155667a3e24283a67417d6333216d

Download Submit
C:\Users\Admin\AppData\Local\Temp\csrss.exe

Filesize
139KB

MD5
42eb394ea1002c0a3c769c67f111eb02

SHA1
6fc812af321a4019692ed3f12c56d34dd2e71bc5

SHA256
ffb4e96f08c611fbd3811e3607ab90e1847147a3f604e9e5dfbcc515a10c215c

SHA512
3fefc004ccb923f4f6c4dfd9163aff75d6fa9dd13baea9654eb861cc0c358a9802c510dd63f7129d453c4e6eb7b6bb5e4ce155667a3e24283a67417d6333216d

Download Submit
\Users\Admin\AppData\Local\Temp\csrss.exe

Filesize
139KB

MD5
42eb394ea1002c0a3c769c67f111eb02

SHA1
6fc812af321a4019692ed3f12c56d34dd2e71bc5

SHA256
ffb4e96f08c611fbd3811e3607ab90e1847147a3f604e9e5dfbcc515a10c215c

SHA512
3fefc004ccb923f4f6c4dfd9163aff75d6fa9dd13baea9654eb861cc0c358a9802c510dd63f7129d453c4e6eb7b6bb5e4ce155667a3e24283a67417d6333216d

Download Submit
memory/1148-54-0x0000000074C11000-0x0000000074C13000-memory.dmp

Filesize
8KB

Download
memory/1148-55-0x0000000073EB0000-0x000000007445B000-memory.dmp

Filesize
5.7MB

Download
memory/1148-62-0x0000000073EB0000-0x000000007445B000-memory.dmp

Filesize
5.7MB

Download
memory/1792-63-0x0000000073EB0000-0x000000007445B000-memory.dmp

Filesize
5.7MB

Download
memory/1792-65-0x0000000073EB0000-0x000000007445B000-memory.dmp

Filesize
5.7MB

Download

Analysis

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