cosmu | 9c10b33dc9cf7bfef3921f433da84e135edb9b3536912199a3d382f0d0264860

Analysis

max time kernel
148s
max time network
125s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260709-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
25/08/2026, 14:38

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General

Target
2026-08-24_4205b68ea51d585d794091711fe11632_elex_wannacry.exe
Size 25KB
Sample260825-rz2t9stdpg
SHA256 9c10b33dc9cf7bfef3921f433da84e135edb9b3536912199a3d382f0d0264860
MD5 4205b68ea51d585d794091711fe11632
SHA1 9381f4474f3a31d7b8b6144402c7cb6cf97bf603
SHA512 0aad562face6aff90fd712cf24574ecc7a2f7c205d8045643eff67012b0c82b5693c4c880457c991d3a1464ebe6bb8f6b6124c9805242090ac3cddb2b758efc9
SSDEEP 384:NBt7Br5xjLlwAgA71Fbhv/r+k7ha3ZzpsVvUaWq9C7:d7BlpxwpARFbh6qepim2
TLSH
T106B25B5E8B49C072C38550345C2F687D8DB7443CBE26DB7BAB568D18AABA3C0FC3515A
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery cosmu worm

Malware Config

Signatures

Family: Cosmu
Cosmu is a Windows worm written in C++.
worm cosmu

Detects Cosmu payload 2 IoCs

Cosmu is a worm written in C++.

resource	yara_rule
behavioral2/memory/4076-0-0x0000000000400000-0x0000000000409D5C-memory.dmp	family_cosmu
behavioral2/memory/4076-1-0x0000000000400000-0x0000000000409D5C-memory.dmp	family_cosmu

Detects executables packed with eXPressor 2 IoCs

resource	yara_rule
behavioral2/memory/4076-0-0x0000000000400000-0x0000000000409D5C-memory.dmp	INDICATOR_EXE_Packed_eXPressor
behavioral2/memory/4076-1-0x0000000000400000-0x0000000000409D5C-memory.dmp	INDICATOR_EXE_Packed_eXPressor

Program crash 1 IoCs

pid	pid_target	Process	procid_target
4856	4076	WerFault.exe	87

System Location Discovery: System Language Discovery 1 TTPs 1 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	2026-08-24_4205b68ea51d585d794091711fe11632_elex_wannacry.exe

C:\Users\Admin\AppData\Local\Temp\2026-08-24_4205b68ea51d585d794091711fe11632_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-24_4205b68ea51d585d794091711fe11632_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
PID:4076
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4076 -s 308
  2⤵
  - Program crash
  PID:4856

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 4076 -ip 4076
1⤵
PID:6036

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/4076-0-0x0000000000400000-0x0000000000409D5C-memory.dmp

Download

memory/4076-1-0x0000000000400000-0x0000000000409D5C-memory.dmp