isrstealer | 77fa41018a41ea51bf2b093a35c2ea4caf6ca6b8cb9ed94ad04ed5c64cd680ef

General

Target

b24b97b44f7e1b8a5299ab4d616052d6_JaffaCakes118.exe
Size

4.4MB
MD5

b24b97b44f7e1b8a5299ab4d616052d6
SHA1

bf51fe44e27751b4b499ed2fcc2db2fd320ad678
SHA256

77fa41018a41ea51bf2b093a35c2ea4caf6ca6b8cb9ed94ad04ed5c64cd680ef
SHA512

78c84024039c10bae520f60d29d9fd6057486cf1e5c119585731138169614ce90ab9aa9106746036254cf93f020fa6c7098335fc7b5f8496db014f8369d09a05
SSDEEP

6144:7/m9kF4LhB959Ak24Fa8yVRasuSuvfQ1dskAsaJraBCDorAB:bfFWB9bpFatVMPfgsVpraB

Score

10^/10

isrstealer credential_access discovery 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 4 IoCs

resource	yara_rule
behavioral2/memory/3572-3-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/3572-5-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/3572-20-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/3572-24-0x0000000000400000-0x0000000000435000-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

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000\Control Panel\International\Geo\Nation	b24b97b44f7e1b8a5299ab4d616052d6_JaffaCakes118.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/2704-10-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2704-11-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2704-12-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2704-8-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2704-16-0x0000000000400000-0x0000000000453000-memory.dmp	upx

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 3144 set thread context of 3572	3144	b24b97b44f7e1b8a5299ab4d616052d6_JaffaCakes118.exe	86
PID 3572 set thread context of 2704	3572	vbc.exe	87

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 5 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	b24b97b44f7e1b8a5299ab4d616052d6_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vbc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vbc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
516	cmd.exe
2432	PING.EXE

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2432	PING.EXE

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3572	vbc.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 3144 wrote to memory of 3572	3144	b24b97b44f7e1b8a5299ab4d616052d6_JaffaCakes118.exe	86
PID 3144 wrote to memory of 3572	3144	b24b97b44f7e1b8a5299ab4d616052d6_JaffaCakes118.exe	86
PID 3144 wrote to memory of 3572	3144	b24b97b44f7e1b8a5299ab4d616052d6_JaffaCakes118.exe	86
PID 3144 wrote to memory of 3572	3144	b24b97b44f7e1b8a5299ab4d616052d6_JaffaCakes118.exe	86
PID 3144 wrote to memory of 3572	3144	b24b97b44f7e1b8a5299ab4d616052d6_JaffaCakes118.exe	86
PID 3144 wrote to memory of 3572	3144	b24b97b44f7e1b8a5299ab4d616052d6_JaffaCakes118.exe	86
PID 3144 wrote to memory of 3572	3144	b24b97b44f7e1b8a5299ab4d616052d6_JaffaCakes118.exe	86
PID 3144 wrote to memory of 3572	3144	b24b97b44f7e1b8a5299ab4d616052d6_JaffaCakes118.exe	86
PID 3572 wrote to memory of 2704	3572	vbc.exe	87
PID 3572 wrote to memory of 2704	3572	vbc.exe	87
PID 3572 wrote to memory of 2704	3572	vbc.exe	87
PID 3572 wrote to memory of 2704	3572	vbc.exe	87
PID 3572 wrote to memory of 2704	3572	vbc.exe	87
PID 3572 wrote to memory of 2704	3572	vbc.exe	87
PID 3572 wrote to memory of 2704	3572	vbc.exe	87
PID 3572 wrote to memory of 2704	3572	vbc.exe	87
PID 3144 wrote to memory of 516	3144	b24b97b44f7e1b8a5299ab4d616052d6_JaffaCakes118.exe	89
PID 3144 wrote to memory of 516	3144	b24b97b44f7e1b8a5299ab4d616052d6_JaffaCakes118.exe	89
PID 3144 wrote to memory of 516	3144	b24b97b44f7e1b8a5299ab4d616052d6_JaffaCakes118.exe	89
PID 516 wrote to memory of 2432	516	cmd.exe	91
PID 516 wrote to memory of 2432	516	cmd.exe	91
PID 516 wrote to memory of 2432	516	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\b24b97b44f7e1b8a5299ab4d616052d6_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\b24b97b44f7e1b8a5299ab4d616052d6_JaffaCakes118.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3144
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
  C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3572
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\St7HxTZiby.ini"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:2704
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C ping 1.1.1.1 -n 1 -w 1000 > Nul & Del "C:\Users\Admin\AppData\Local\Temp\b24b97b44f7e1b8a5299ab4d616052d6_JaffaCakes118.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:516
- - C:\Windows\SysWOW64\PING.EXE
    ping 1.1.1.1 -n 1 -w 1000
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:2432

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scripting

1

T1064

Persistence

Privilege Escalation

Defense Evasion

Scripting

1

T1064

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Discovery

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\St7HxTZiby.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/2704-14-0x0000000000460000-0x0000000000529000-memory.dmp

Filesize
804KB

Download
memory/2704-8-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2704-16-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2704-12-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2704-10-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2704-11-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3144-2-0x00000000746C0000-0x0000000074C71000-memory.dmp

Filesize
5.7MB

Download
memory/3144-0-0x00000000746C2000-0x00000000746C3000-memory.dmp

Filesize
4KB

Download
memory/3144-18-0x00000000746C0000-0x0000000074C71000-memory.dmp

Filesize
5.7MB

Download
memory/3144-1-0x00000000746C0000-0x0000000074C71000-memory.dmp

Filesize
5.7MB

Download
memory/3572-5-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/3572-3-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/3572-20-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/3572-24-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download

Analysis

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