isrstealer | 563dd975f0211df190d9c1ac1538c16ea3a82aba413f199b5b7000c08570a1e2

General

Target

8c5f105eb24d29e66e1b89a734f0aada_JaffaCakes118.exe
Size

240KB
MD5

8c5f105eb24d29e66e1b89a734f0aada
SHA1

2d3fbdd86bd1e441f7050436e5eac56dade36541
SHA256

563dd975f0211df190d9c1ac1538c16ea3a82aba413f199b5b7000c08570a1e2
SHA512

b836ee8b2637d5122735618935caefa0d8359590357aa1ad90469f14028e9d1ce1edfa569aeb76bcf55895f253a7735f8891e9076570f79a45ae0bd4383e092b
SSDEEP

6144:wLa94GN7fiIEAeLHJx0ZW6x6FJzw4E5i3ZUp/yq0DASrikrhwKACS:wW94GN7fiIEAeLHJx0ZWJjjNJcyq8rzs

Score

10^/10

isrstealer bootkit credential_access discovery persistence spyware stealer trojan upx

Malware Config

Signatures

ISR Stealer
ISR Stealer is a modified version of Hackhound Stealer written in visual basic.
trojan stealer isrstealer

ISR Stealer payload 3 IoCs

resource	yara_rule
behavioral1/memory/3160-4-0x0000000000400000-0x0000000000432000-memory.dmp	family_isrstealer
behavioral1/memory/3160-2-0x0000000000400000-0x0000000000432000-memory.dmp	family_isrstealer
behavioral1/memory/3160-16-0x0000000000400000-0x0000000000432000-memory.dmp	family_isrstealer

Credentials from Password Stores: Credentials from Web Browsers 1 TTPs
Malicious Access or copy of Web Browser Credential store.
credential_access stealer

Credentials from Web Browsers
T1555.003
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

UPX packed file 5 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral1/memory/1084-7-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1084-9-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1084-10-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1084-11-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1084-13-0x0000000000400000-0x0000000000453000-memory.dmp	upx

Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs

Bootkits write to the MBR to gain persistence at a level below the operating system.

bootkit persistence

Bootkit

T1542.003

description	ioc	Process
File opened for modification	\??\PhysicalDrive0	8c5f105eb24d29e66e1b89a734f0aada_JaffaCakes118.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 4928 set thread context of 3160	4928	8c5f105eb24d29e66e1b89a734f0aada_JaffaCakes118.exe	92
PID 3160 set thread context of 1084	3160	8c5f105eb24d29e66e1b89a734f0aada_JaffaCakes118.exe	93

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	8c5f105eb24d29e66e1b89a734f0aada_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	8c5f105eb24d29e66e1b89a734f0aada_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	8c5f105eb24d29e66e1b89a734f0aada_JaffaCakes118.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4928	8c5f105eb24d29e66e1b89a734f0aada_JaffaCakes118.exe
3160	8c5f105eb24d29e66e1b89a734f0aada_JaffaCakes118.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 4928 wrote to memory of 3160	4928	8c5f105eb24d29e66e1b89a734f0aada_JaffaCakes118.exe	92
PID 4928 wrote to memory of 3160	4928	8c5f105eb24d29e66e1b89a734f0aada_JaffaCakes118.exe	92
PID 4928 wrote to memory of 3160	4928	8c5f105eb24d29e66e1b89a734f0aada_JaffaCakes118.exe	92
PID 4928 wrote to memory of 3160	4928	8c5f105eb24d29e66e1b89a734f0aada_JaffaCakes118.exe	92
PID 4928 wrote to memory of 3160	4928	8c5f105eb24d29e66e1b89a734f0aada_JaffaCakes118.exe	92
PID 4928 wrote to memory of 3160	4928	8c5f105eb24d29e66e1b89a734f0aada_JaffaCakes118.exe	92
PID 4928 wrote to memory of 3160	4928	8c5f105eb24d29e66e1b89a734f0aada_JaffaCakes118.exe	92
PID 4928 wrote to memory of 3160	4928	8c5f105eb24d29e66e1b89a734f0aada_JaffaCakes118.exe	92
PID 3160 wrote to memory of 1084	3160	8c5f105eb24d29e66e1b89a734f0aada_JaffaCakes118.exe	93
PID 3160 wrote to memory of 1084	3160	8c5f105eb24d29e66e1b89a734f0aada_JaffaCakes118.exe	93
PID 3160 wrote to memory of 1084	3160	8c5f105eb24d29e66e1b89a734f0aada_JaffaCakes118.exe	93
PID 3160 wrote to memory of 1084	3160	8c5f105eb24d29e66e1b89a734f0aada_JaffaCakes118.exe	93
PID 3160 wrote to memory of 1084	3160	8c5f105eb24d29e66e1b89a734f0aada_JaffaCakes118.exe	93
PID 3160 wrote to memory of 1084	3160	8c5f105eb24d29e66e1b89a734f0aada_JaffaCakes118.exe	93
PID 3160 wrote to memory of 1084	3160	8c5f105eb24d29e66e1b89a734f0aada_JaffaCakes118.exe	93
PID 3160 wrote to memory of 1084	3160	8c5f105eb24d29e66e1b89a734f0aada_JaffaCakes118.exe	93

C:\Users\Admin\AppData\Local\Temp\8c5f105eb24d29e66e1b89a734f0aada_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\8c5f105eb24d29e66e1b89a734f0aada_JaffaCakes118.exe"
1⤵
- Writes to the Master Boot Record (MBR)
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4928
- C:\Users\Admin\AppData\Local\Temp\8c5f105eb24d29e66e1b89a734f0aada_JaffaCakes118.exe
  "C:\Users\Admin\AppData\Local\Temp\8c5f105eb24d29e66e1b89a734f0aada_JaffaCakes118.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3160
- - C:\Users\Admin\AppData\Local\Temp\8c5f105eb24d29e66e1b89a734f0aada_JaffaCakes118.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\tmp.ini"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:1084

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=4248,i,15436195446242760253,4000484513008731869,262144 --variations-seed-version --mojo-platform-channel-handle=4212 /prefetch:8
1⤵
PID:4440

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=1436,i,15436195446242760253,4000484513008731869,262144 --variations-seed-version --mojo-platform-channel-handle=4224 /prefetch:8
1⤵
PID:1956

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Privilege Escalation

Defense Evasion

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/1084-7-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1084-9-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1084-10-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1084-11-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1084-13-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3160-4-0x0000000000400000-0x0000000000432000-memory.dmp

Filesize
200KB

Download
memory/3160-2-0x0000000000400000-0x0000000000432000-memory.dmp

Filesize
200KB

Download
memory/3160-16-0x0000000000400000-0x0000000000432000-memory.dmp

Filesize
200KB

Download

Resubmissions

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads