1e2ebcbe40e7534b5836b6932cf71aaec8976eff0e7b6d8b23bec0a0a1c4f57f

Analysis

max time kernel
119s
max time network
120s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
06/10/2024, 10:53

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General

Target

zcodec.exe
Size

24KB
MD5

3c5d65163ae64c0cb3a5177b3f1676ed
SHA1

c743fdb4a494a8a9a099a5b7aa70fddcf1dde960
SHA256

468695f88f69c636be9538f3d3cc74cd6d8ca9cb116af68dddd8c95b707711fb
SHA512

5ae43a192040f6eb12c28a8d310c5fa92d4edadcb9edb32c124ed00b353fcb4600b50240285ff6c4590a83d890d45b0c5c7323f04961f3a056afa8477e575afd
SSDEEP

768:tmyWdNYzpVOtDawJxP/H4RbloY2wBQqlkGY:cDYdIDa0RvoZoYhhO

Score

7^/10

defense_evasion discovery

Malware Config

Signatures

Deletes itself 1 IoCs

pid	Process
2768	cmd.exe

Executes dropped EXE 1 IoCs

pid	Process
2080	regperf.exe

Loads dropped DLL 2 IoCs

pid	Process
2192	zcodec.exe
2192	zcodec.exe

Indicator Removal: File Deletion 1 TTPs
Adversaries may delete files left behind by the actions of their intrusion activity.
defense_evasion

File Deletion
T1070.004

Drops file in System32 directory 4 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\regperf.exe	zcodec.exe
File opened for modification	C:\Windows\SysWOW64\regperf.exe	zcodec.exe
File created	C:\Windows\SysWOW64\ld100.tmp	regperf.exe
File opened for modification	C:\Windows\SysWOW64\ld100.tmp	regperf.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 3 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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	zcodec.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	regperf.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2080	regperf.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeIncBasePriorityPrivilege	2192	zcodec.exe
Token: SeDebugPrivilege	2080	regperf.exe

Suspicious use of UnmapMainImage 1 IoCs

pid	Process
2192	zcodec.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2192 wrote to memory of 2080	2192	zcodec.exe	28
PID 2192 wrote to memory of 2080	2192	zcodec.exe	28
PID 2192 wrote to memory of 2080	2192	zcodec.exe	28
PID 2192 wrote to memory of 2080	2192	zcodec.exe	28
PID 2080 wrote to memory of 432	2080	regperf.exe	5
PID 2192 wrote to memory of 2768	2192	zcodec.exe	29
PID 2192 wrote to memory of 2768	2192	zcodec.exe	29
PID 2192 wrote to memory of 2768	2192	zcodec.exe	29
PID 2192 wrote to memory of 2768	2192	zcodec.exe	29

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:432

C:\Users\Admin\AppData\Local\Temp\zcodec.exe
"C:\Users\Admin\AppData\Local\Temp\zcodec.exe"
1⤵
- Loads dropped DLL
- Drops file in System32 directory
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of UnmapMainImage
- Suspicious use of WriteProcessMemory
PID:2192
- C:\Windows\SysWOW64\regperf.exe
  C:\Windows\system32\regperf.exe
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2080
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\system32\cmd.exe" /c del C:\Users\Admin\AppData\Local\Temp\zcodec.exe > nul
  2⤵
  - Deletes itself
  - System Location Discovery: System Language Discovery
  PID:2768

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Indicator Removal

T1070

File Deletion

T1070.004

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

C:\Windows\SysWOW64\regperf.exe

Filesize
77KB

MD5
450ea55d47e24bc8d1be99c710816cd3

SHA1
f1f576f7ceae459b1670748dbf9a58169e9465a7

SHA256
7ed1b483b66c30eee4f2103ccf3786f0fa5e552ac6c3c1460fa23105276f8f99

SHA512
54d856afa6a39ad4fbf0469d98305c8edecca47ebd45e3edebaace5a676ca50df3a2fe766a1084c402e3fcb2d0a6bf9173d34236d06f844da7b2691f6ebd7538

Download Submit
memory/432-12-0x0000000000B00000-0x0000000000B01000-memory.dmp

Filesize
4KB

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