isrstealer | 80107993f5db235356aa80d02a1b0111df046d6e825120dba4cab00efaee840e

General

Target

40c0f7b8cd328e3c0134bc7ace73276c_JaffaCakes118.exe
Size

841KB
MD5

40c0f7b8cd328e3c0134bc7ace73276c
SHA1

ff68428e621a081c85c5669b1c01160b70fcec1f
SHA256

80107993f5db235356aa80d02a1b0111df046d6e825120dba4cab00efaee840e
SHA512

cbcc02e5c056e12ae2a0bb5e794916004d31814a042b9f52b9e6eafb39157a3ac41cbe0e9e554987bf5f8a7850ecb8178947d15892d6744514ac0bde20324a63
SSDEEP

24576:5RmJkcoQricOIQxiZY1iaLcH/Jk57CUJl:WJZoQrbTFZY1iaLDRCUJl

Score

10^/10

isrstealer 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 3 IoCs

resource	yara_rule
behavioral2/memory/4120-0-0x0000000000400000-0x0000000000438000-memory.dmp	family_isrstealer
behavioral2/memory/4120-2-0x0000000000400000-0x0000000000438000-memory.dmp	family_isrstealer
behavioral2/memory/4120-13-0x0000000000400000-0x0000000000438000-memory.dmp	family_isrstealer

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2380 set thread context of 4120	2380	40c0f7b8cd328e3c0134bc7ace73276c_JaffaCakes118.exe	86
PID 4120 set thread context of 4352	4120	svchost.exe	87

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4352-5-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4352-7-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4352-9-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4352-8-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4352-11-0x0000000000400000-0x0000000000453000-memory.dmp	upx

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	40c0f7b8cd328e3c0134bc7ace73276c_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4120	svchost.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 2380 wrote to memory of 4120	2380	40c0f7b8cd328e3c0134bc7ace73276c_JaffaCakes118.exe	86
PID 2380 wrote to memory of 4120	2380	40c0f7b8cd328e3c0134bc7ace73276c_JaffaCakes118.exe	86
PID 2380 wrote to memory of 4120	2380	40c0f7b8cd328e3c0134bc7ace73276c_JaffaCakes118.exe	86
PID 2380 wrote to memory of 4120	2380	40c0f7b8cd328e3c0134bc7ace73276c_JaffaCakes118.exe	86
PID 2380 wrote to memory of 4120	2380	40c0f7b8cd328e3c0134bc7ace73276c_JaffaCakes118.exe	86
PID 2380 wrote to memory of 4120	2380	40c0f7b8cd328e3c0134bc7ace73276c_JaffaCakes118.exe	86
PID 2380 wrote to memory of 4120	2380	40c0f7b8cd328e3c0134bc7ace73276c_JaffaCakes118.exe	86
PID 2380 wrote to memory of 4120	2380	40c0f7b8cd328e3c0134bc7ace73276c_JaffaCakes118.exe	86
PID 4120 wrote to memory of 4352	4120	svchost.exe	87
PID 4120 wrote to memory of 4352	4120	svchost.exe	87
PID 4120 wrote to memory of 4352	4120	svchost.exe	87
PID 4120 wrote to memory of 4352	4120	svchost.exe	87
PID 4120 wrote to memory of 4352	4120	svchost.exe	87
PID 4120 wrote to memory of 4352	4120	svchost.exe	87
PID 4120 wrote to memory of 4352	4120	svchost.exe	87
PID 4120 wrote to memory of 4352	4120	svchost.exe	87

C:\Users\Admin\AppData\Local\Temp\40c0f7b8cd328e3c0134bc7ace73276c_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\40c0f7b8cd328e3c0134bc7ace73276c_JaffaCakes118.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2380
- C:\Windows\SysWOW64\svchost.exe
  "C:\Windows\SysWOW64\svchost.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4120
- - C:\Windows\SysWOW64\svchost.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\tmp.ini"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:4352

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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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/4120-0-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/4120-2-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/4120-13-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/4352-5-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4352-7-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4352-9-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4352-8-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4352-11-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download

Analysis

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