expiro | ab8a102820fe8cf95b67f8ef42f2800c659bf65c73987e8bb5037e7f3d6a314c

Analysis

max time kernel
121s
max time network
126s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
09-01-2025 19:20

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General

Target

JaffaCakes118_d0483069db2ef3f8daccc6c7d8b25643.exe
Size

437KB
MD5

d0483069db2ef3f8daccc6c7d8b25643
SHA1

e2e0c2f66d32704fb01e0906bcdb0e2d7d120980
SHA256

ab8a102820fe8cf95b67f8ef42f2800c659bf65c73987e8bb5037e7f3d6a314c
SHA512

f9c15a2340fb57e1f09b72a4cf2d14605f5c6017d70ebbf0e9870ac3874a7ccb48020a06451e2ba7e7e36f7dc9123a802a2b0cf3f948f70a809550317687f993
SSDEEP

6144:UCVwm2i+mKaN68U8Wdvym8fXZk3/L07IkX/c6MVO4zXUdn1NwBLDmFBF3UN:Cri+m/A4Wx3UW/LzARMVO4sNyDm3F3U

Score

10^/10

expiro backdoor discovery

Malware Config

Signatures

Expiro family
expiro
Expiro, m0yv
Expiro aka m0yv is a multi-functional backdoor written in C++.
backdoor expiro

Expiro payload 4 IoCs

backdoor

resource	yara_rule
behavioral1/memory/3056-0-0x0000000001320000-0x00000000013B4000-memory.dmp	family_expiro1
behavioral1/memory/3056-1-0x00000000012B0000-0x00000000013B4000-memory.dmp	family_expiro1
behavioral1/memory/3056-2-0x0000000001320000-0x00000000013B4000-memory.dmp	family_expiro1
behavioral1/memory/3056-3-0x00000000012B0000-0x00000000013B4000-memory.dmp	family_expiro1

Program crash 1 IoCs

pid	pid_target	Process	procid_target
1636	3056	WerFault.exe	29

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	JaffaCakes118_d0483069db2ef3f8daccc6c7d8b25643.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 3056 wrote to memory of 1636	3056	JaffaCakes118_d0483069db2ef3f8daccc6c7d8b25643.exe	30
PID 3056 wrote to memory of 1636	3056	JaffaCakes118_d0483069db2ef3f8daccc6c7d8b25643.exe	30
PID 3056 wrote to memory of 1636	3056	JaffaCakes118_d0483069db2ef3f8daccc6c7d8b25643.exe	30
PID 3056 wrote to memory of 1636	3056	JaffaCakes118_d0483069db2ef3f8daccc6c7d8b25643.exe	30

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_d0483069db2ef3f8daccc6c7d8b25643.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_d0483069db2ef3f8daccc6c7d8b25643.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3056
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 3056 -s 160
  2⤵
  - Program crash
  PID:1636

Network

MITRE ATT&CK Enterprise v15

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/3056-0-0x0000000001320000-0x00000000013B4000-memory.dmp

Filesize
592KB

Download
memory/3056-1-0x00000000012B0000-0x00000000013B4000-memory.dmp

Filesize
1.0MB

Download
memory/3056-2-0x0000000001320000-0x00000000013B4000-memory.dmp

Filesize
592KB

Download
memory/3056-3-0x00000000012B0000-0x00000000013B4000-memory.dmp

Filesize
1.0MB

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