7ec5b466d139b05ca9980b0ba59a754ddfbae1948e263136fa2ba42d1e96abd0

Analysis

max time kernel
119s
max time network
120s
platform
windows7_x64
resource
win7-20240708-en
resource tags

arch:x64arch:x86image:win7-20240708-enlocale:en-usos:windows7-x64system
submitted
07/09/2024, 12:16

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General

Target

7efc274c76d04761bb3e4837bd7179f0N.exe
Size

288KB
MD5

7efc274c76d04761bb3e4837bd7179f0
SHA1

7aa810c72fca5402bb29b8a28f62ea4220b2fb5c
SHA256

7ec5b466d139b05ca9980b0ba59a754ddfbae1948e263136fa2ba42d1e96abd0
SHA512

28b760204c2b231dabc6c66d1023843f2c2f6fc3e8ab6ed325e0aef316d08c3c8e88e14557f0840ec86b2a72c75c7ec49a75fd2e847a265f8e9b9569750030c0
SSDEEP

6144:gQ+Tyfx4NF67Sbq2nW82X45gc3BaLZVS0mOoC8zbzDie:gQMyfmNFHfnWfhLZVHmOog

Score

7^/10

discovery

Malware Config

Signatures

Executes dropped EXE 2 IoCs

pid	Process
2728	csrssys.exe
2880	csrssys.exe

Loads dropped DLL 4 IoCs

pid	Process
1700	7efc274c76d04761bb3e4837bd7179f0N.exe
1700	7efc274c76d04761bb3e4837bd7179f0N.exe
1700	7efc274c76d04761bb3e4837bd7179f0N.exe
2728	csrssys.exe

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	7efc274c76d04761bb3e4837bd7179f0N.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	csrssys.exe

Modifies registry class 28 IoCs

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1506706701-1246725540-2219210854-1000_CLASSES\wexplorer\ = "Application"	7efc274c76d04761bb3e4837bd7179f0N.exe
Key created	\REGISTRY\USER\S-1-5-21-1506706701-1246725540-2219210854-1000_CLASSES\wexplorer\shell\open\command	7efc274c76d04761bb3e4837bd7179f0N.exe
Key created	\REGISTRY\USER\S-1-5-21-1506706701-1246725540-2219210854-1000_CLASSES\.exe	7efc274c76d04761bb3e4837bd7179f0N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1506706701-1246725540-2219210854-1000_CLASSES\.exe\Content-Type = "application/x-msdownload"	7efc274c76d04761bb3e4837bd7179f0N.exe
Key created	\REGISTRY\USER\S-1-5-21-1506706701-1246725540-2219210854-1000_CLASSES\.exe\shell	7efc274c76d04761bb3e4837bd7179f0N.exe
Key created	\REGISTRY\USER\S-1-5-21-1506706701-1246725540-2219210854-1000_CLASSES\.exe\DefaultIcon	7efc274c76d04761bb3e4837bd7179f0N.exe
Key created	\REGISTRY\USER\S-1-5-21-1506706701-1246725540-2219210854-1000_CLASSES\.exe\shell\open	7efc274c76d04761bb3e4837bd7179f0N.exe
Key created	\REGISTRY\USER\S-1-5-21-1506706701-1246725540-2219210854-1000_CLASSES\wexplorer	7efc274c76d04761bb3e4837bd7179f0N.exe
Key created	\REGISTRY\USER\S-1-5-21-1506706701-1246725540-2219210854-1000_CLASSES\.exe\shell\open\command	7efc274c76d04761bb3e4837bd7179f0N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1506706701-1246725540-2219210854-1000_CLASSES\.exe\shell\open\command\IsolatedCommand = "\"%1\" %*"	7efc274c76d04761bb3e4837bd7179f0N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1506706701-1246725540-2219210854-1000_CLASSES\wexplorer\shell\runas\command\IsolatedCommand = "\"%1\" %*"	7efc274c76d04761bb3e4837bd7179f0N.exe
Key created	\REGISTRY\USER\S-1-5-21-1506706701-1246725540-2219210854-1000_CLASSES\.exe\shell\runas\command	7efc274c76d04761bb3e4837bd7179f0N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1506706701-1246725540-2219210854-1000_CLASSES\wexplorer\Content-Type = "application/x-msdownload"	7efc274c76d04761bb3e4837bd7179f0N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1506706701-1246725540-2219210854-1000_CLASSES\wexplorer\shell\open\command\IsolatedCommand = "\"%1\" %*"	7efc274c76d04761bb3e4837bd7179f0N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1506706701-1246725540-2219210854-1000_CLASSES\.exe\ = "wexplorer"	7efc274c76d04761bb3e4837bd7179f0N.exe
Key created	\REGISTRY\USER\S-1-5-21-1506706701-1246725540-2219210854-1000_CLASSES\wexplorer\shell\runas\command	7efc274c76d04761bb3e4837bd7179f0N.exe
Key created	\REGISTRY\USER\S-1-5-21-1506706701-1246725540-2219210854-1000_CLASSES\wexplorer\shell\runas	7efc274c76d04761bb3e4837bd7179f0N.exe
Key created	\REGISTRY\USER\S-1-5-21-1506706701-1246725540-2219210854-1000_CLASSES\.exe\shell\runas	7efc274c76d04761bb3e4837bd7179f0N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1506706701-1246725540-2219210854-1000_CLASSES\.exe\shell\runas\command\ = "\"%1\" %*"	7efc274c76d04761bb3e4837bd7179f0N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1506706701-1246725540-2219210854-1000_CLASSES\wexplorer\DefaultIcon\ = "%1"	7efc274c76d04761bb3e4837bd7179f0N.exe
Key created	\REGISTRY\USER\S-1-5-21-1506706701-1246725540-2219210854-1000_CLASSES\wexplorer\shell	7efc274c76d04761bb3e4837bd7179f0N.exe
Key created	\REGISTRY\USER\S-1-5-21-1506706701-1246725540-2219210854-1000_CLASSES\wexplorer\shell\open	7efc274c76d04761bb3e4837bd7179f0N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1506706701-1246725540-2219210854-1000_CLASSES\wexplorer\shell\open\command\ = "\"C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Sys32\\csrssys.exe\" /START \"%1\" %*"	7efc274c76d04761bb3e4837bd7179f0N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1506706701-1246725540-2219210854-1000_CLASSES\.exe\shell\open\command\ = "\"C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Sys32\\csrssys.exe\" /START \"%1\" %*"	7efc274c76d04761bb3e4837bd7179f0N.exe
Key created	\REGISTRY\USER\S-1-5-21-1506706701-1246725540-2219210854-1000_CLASSES\wexplorer\DefaultIcon	7efc274c76d04761bb3e4837bd7179f0N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1506706701-1246725540-2219210854-1000_CLASSES\wexplorer\shell\runas\command\ = "\"%1\" %*"	7efc274c76d04761bb3e4837bd7179f0N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1506706701-1246725540-2219210854-1000_CLASSES\.exe\DefaultIcon\ = "%1"	7efc274c76d04761bb3e4837bd7179f0N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1506706701-1246725540-2219210854-1000_CLASSES\.exe\shell\runas\command\IsolatedCommand = "\"%1\" %*"	7efc274c76d04761bb3e4837bd7179f0N.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeIncBasePriorityPrivilege	2728	csrssys.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1700 wrote to memory of 2728	1700	7efc274c76d04761bb3e4837bd7179f0N.exe	30
PID 1700 wrote to memory of 2728	1700	7efc274c76d04761bb3e4837bd7179f0N.exe	30
PID 1700 wrote to memory of 2728	1700	7efc274c76d04761bb3e4837bd7179f0N.exe	30
PID 1700 wrote to memory of 2728	1700	7efc274c76d04761bb3e4837bd7179f0N.exe	30
PID 2728 wrote to memory of 2880	2728	csrssys.exe	31
PID 2728 wrote to memory of 2880	2728	csrssys.exe	31
PID 2728 wrote to memory of 2880	2728	csrssys.exe	31
PID 2728 wrote to memory of 2880	2728	csrssys.exe	31

C:\Users\Admin\AppData\Local\Temp\7efc274c76d04761bb3e4837bd7179f0N.exe
"C:\Users\Admin\AppData\Local\Temp\7efc274c76d04761bb3e4837bd7179f0N.exe"
1⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:1700
- C:\Users\Admin\AppData\Roaming\Microsoft\Sys32\csrssys.exe
  "C:\Users\Admin\AppData\Roaming\Microsoft\Sys32\csrssys.exe" /START "C:\Users\Admin\AppData\Roaming\Microsoft\Sys32\csrssys.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2728
- - C:\Users\Admin\AppData\Roaming\Microsoft\Sys32\csrssys.exe
    "C:\Users\Admin\AppData\Roaming\Microsoft\Sys32\csrssys.exe"
    3⤵
    - Executes dropped EXE
    PID:2880

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

\Users\Admin\AppData\Roaming\Microsoft\Sys32\csrssys.exe

Filesize
288KB

MD5
fefcd0641306ab75581c58b86d77578c

SHA1
aecc97f6fc69190587be54ce653382b1d63373ad

SHA256
8ffc4a3af9db1cb3b5a10779e7f5e8a8d34f95e8350b93b33b8638518c229d5c

SHA512
f3ecf56382fb975c59303c2ddb789b8840b1b7b2577b4552de25edc67ed2251b6399c72603e858dac2c4ad54a65449662e7bb131a0f508499ed8027eb823597f

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