isrstealer | 1ae74f90f7fd260d6821ab8fafa9055348c203c2c9282dbbbbaf6537a07f8c2e

General

Target

PURCHASE#ORDER#466657732883.exe
Size

1.1MB
MD5

021563e9bea3b8ba2aaf553c0788095a
SHA1

609ec1923cfa157a7184c2cd3457c9f2cd0c95e7
SHA256

363284566ccb6103fcf30d4cd766e09fdcbe40afb2792b528d1f643a1baf4684
SHA512

21ec708452f00511dc7c371fa0cb78fcd50384b656708b144ad16b6dd3b457ef43777e2e0df87d2d0d33408e8a19144c7135a2b5aa38f81ee402461f46a3f9b5
SSDEEP

12288:ZaWzgMg7v3qnCiMErQohh0F4CCJ8lny/Q6//r69oGE15jSsFZyoop6WCD+z:4aHMv6Corjqny/Q6/zsoRNFZyouC2

Score

10^/10

isrstealer collection 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 6 IoCs

resource	yara_rule
behavioral1/memory/1532-58-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1532-60-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1532-61-0x0000000000401180-mapping.dmp	family_isrstealer
behavioral1/memory/1532-71-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1532-74-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1532-83-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/1320-81-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/1320-82-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral1/memory/1320-81-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/1320-82-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 9 IoCs

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

upx

resource	yara_rule
behavioral1/memory/952-65-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/952-69-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/952-70-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/952-72-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/952-73-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1320-76-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1320-80-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1320-81-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1320-82-0x0000000000400000-0x000000000041F000-memory.dmp	upx

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
T1081

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	PURCHASE#ORDER#466657732883.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1736 set thread context of 1532	1736	PURCHASE#ORDER#466657732883.exe	28
PID 1532 set thread context of 952	1532	PURCHASE#ORDER#466657732883.exe	29
PID 1532 set thread context of 1320	1532	PURCHASE#ORDER#466657732883.exe	30

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Suspicious use of FindShellTrayWindow 3 IoCs

pid	Process
1736	PURCHASE#ORDER#466657732883.exe
1736	PURCHASE#ORDER#466657732883.exe
1736	PURCHASE#ORDER#466657732883.exe

Suspicious use of SendNotifyMessage 3 IoCs

pid	Process
1736	PURCHASE#ORDER#466657732883.exe
1736	PURCHASE#ORDER#466657732883.exe
1736	PURCHASE#ORDER#466657732883.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1532	PURCHASE#ORDER#466657732883.exe

Suspicious use of WriteProcessMemory 25 IoCs

description	pid	Process	procid_target
PID 1736 wrote to memory of 1532	1736	PURCHASE#ORDER#466657732883.exe	28
PID 1736 wrote to memory of 1532	1736	PURCHASE#ORDER#466657732883.exe	28
PID 1736 wrote to memory of 1532	1736	PURCHASE#ORDER#466657732883.exe	28
PID 1736 wrote to memory of 1532	1736	PURCHASE#ORDER#466657732883.exe	28
PID 1736 wrote to memory of 1532	1736	PURCHASE#ORDER#466657732883.exe	28
PID 1736 wrote to memory of 1532	1736	PURCHASE#ORDER#466657732883.exe	28
PID 1736 wrote to memory of 1532	1736	PURCHASE#ORDER#466657732883.exe	28
PID 1532 wrote to memory of 952	1532	PURCHASE#ORDER#466657732883.exe	29
PID 1532 wrote to memory of 952	1532	PURCHASE#ORDER#466657732883.exe	29
PID 1532 wrote to memory of 952	1532	PURCHASE#ORDER#466657732883.exe	29
PID 1532 wrote to memory of 952	1532	PURCHASE#ORDER#466657732883.exe	29
PID 1532 wrote to memory of 952	1532	PURCHASE#ORDER#466657732883.exe	29
PID 1532 wrote to memory of 952	1532	PURCHASE#ORDER#466657732883.exe	29
PID 1532 wrote to memory of 952	1532	PURCHASE#ORDER#466657732883.exe	29
PID 1532 wrote to memory of 952	1532	PURCHASE#ORDER#466657732883.exe	29
PID 1532 wrote to memory of 952	1532	PURCHASE#ORDER#466657732883.exe	29
PID 1532 wrote to memory of 1320	1532	PURCHASE#ORDER#466657732883.exe	30
PID 1532 wrote to memory of 1320	1532	PURCHASE#ORDER#466657732883.exe	30
PID 1532 wrote to memory of 1320	1532	PURCHASE#ORDER#466657732883.exe	30
PID 1532 wrote to memory of 1320	1532	PURCHASE#ORDER#466657732883.exe	30
PID 1532 wrote to memory of 1320	1532	PURCHASE#ORDER#466657732883.exe	30
PID 1532 wrote to memory of 1320	1532	PURCHASE#ORDER#466657732883.exe	30
PID 1532 wrote to memory of 1320	1532	PURCHASE#ORDER#466657732883.exe	30
PID 1532 wrote to memory of 1320	1532	PURCHASE#ORDER#466657732883.exe	30
PID 1532 wrote to memory of 1320	1532	PURCHASE#ORDER#466657732883.exe	30

C:\Users\Admin\AppData\Local\Temp\PURCHASE#ORDER#466657732883.exe
"C:\Users\Admin\AppData\Local\Temp\PURCHASE#ORDER#466657732883.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:1736
- C:\Users\Admin\AppData\Local\Temp\PURCHASE#ORDER#466657732883.exe
  "C:\Users\Admin\AppData\Local\Temp\PURCHASE#ORDER#466657732883.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1532
- - C:\Users\Admin\AppData\Local\Temp\PURCHASE#ORDER#466657732883.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\v6jnPC7wOD.ini"
    3⤵
    PID:952
- - C:\Users\Admin\AppData\Local\Temp\PURCHASE#ORDER#466657732883.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\tfKJdEYAgR.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:1320

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

1

T1081

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Data from Local System

Email Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\v6jnPC7wOD.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/952-73-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/952-72-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/952-70-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/952-69-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/952-65-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1320-76-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1320-82-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1320-81-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1320-80-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1532-71-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1532-74-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1532-55-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1532-56-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1532-58-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1532-60-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1532-83-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1736-54-0x00000000757B1000-0x00000000757B3000-memory.dmp

Filesize
8KB

Download

Analysis

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