isrstealer | 9d988c7fc830d3ecc91e22d62c6fe585bdcf6e42d61f1e70117022e9c2bc4bc6

General

Target

9d988c7fc830d3ecc91e22d62c6fe585bdcf6e42d61f1e70117022e9c2bc4bc6.exe
Size

385KB
MD5

d7137a7a1b7fedf4304883f06f95c80b
SHA1

963fe4d98c7ec63fca75aa2e0c89c170ad130166
SHA256

9d988c7fc830d3ecc91e22d62c6fe585bdcf6e42d61f1e70117022e9c2bc4bc6
SHA512

df79c0eb4ffdd444237bb0bd9568c4c8741ad1540eb5f72067cbbc46aaf69617c66a52c956397dba4f4c8915f722ed9a1e78cc9099e19f2992672808395c7428
SSDEEP

6144:Cex5IgRXD+t9aU+23hz+hPSrhMu+sUE+nZynycpqvhde/bpqrz6O+U1UJPHmViI:x5IqSbax2xWS+Zytqvh8/dqrOdU1yO

Score

10^/10

isrstealer collection 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/2072-135-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/2072-143-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/2072-155-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/2072-156-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/3592-153-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/3592-154-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral2/memory/3592-153-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/3592-154-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 9 IoCs

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

upx

resource	yara_rule
behavioral2/memory/316-141-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/316-144-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/316-145-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/316-146-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/316-147-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3592-150-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3592-152-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3592-153-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3592-154-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	vbc.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 4432 set thread context of 2072	4432	9d988c7fc830d3ecc91e22d62c6fe585bdcf6e42d61f1e70117022e9c2bc4bc6.exe	82
PID 2072 set thread context of 316	2072	vbc.exe	83
PID 2072 set thread context of 3592	2072	vbc.exe	86

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\Microsoft.NET\Framework\v2.0.50727\config\security.config.cch.new	9d988c7fc830d3ecc91e22d62c6fe585bdcf6e42d61f1e70117022e9c2bc4bc6.exe
File created	C:\Windows\Microsoft.NET\Framework\v2.0.50727\config\enterprisesec.config.cch.new	9d988c7fc830d3ecc91e22d62c6fe585bdcf6e42d61f1e70117022e9c2bc4bc6.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2072	vbc.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 4432 wrote to memory of 2072	4432	9d988c7fc830d3ecc91e22d62c6fe585bdcf6e42d61f1e70117022e9c2bc4bc6.exe	82
PID 4432 wrote to memory of 2072	4432	9d988c7fc830d3ecc91e22d62c6fe585bdcf6e42d61f1e70117022e9c2bc4bc6.exe	82
PID 4432 wrote to memory of 2072	4432	9d988c7fc830d3ecc91e22d62c6fe585bdcf6e42d61f1e70117022e9c2bc4bc6.exe	82
PID 4432 wrote to memory of 2072	4432	9d988c7fc830d3ecc91e22d62c6fe585bdcf6e42d61f1e70117022e9c2bc4bc6.exe	82
PID 4432 wrote to memory of 2072	4432	9d988c7fc830d3ecc91e22d62c6fe585bdcf6e42d61f1e70117022e9c2bc4bc6.exe	82
PID 4432 wrote to memory of 2072	4432	9d988c7fc830d3ecc91e22d62c6fe585bdcf6e42d61f1e70117022e9c2bc4bc6.exe	82
PID 4432 wrote to memory of 2072	4432	9d988c7fc830d3ecc91e22d62c6fe585bdcf6e42d61f1e70117022e9c2bc4bc6.exe	82
PID 4432 wrote to memory of 2072	4432	9d988c7fc830d3ecc91e22d62c6fe585bdcf6e42d61f1e70117022e9c2bc4bc6.exe	82
PID 2072 wrote to memory of 316	2072	vbc.exe	83
PID 2072 wrote to memory of 316	2072	vbc.exe	83
PID 2072 wrote to memory of 316	2072	vbc.exe	83
PID 2072 wrote to memory of 316	2072	vbc.exe	83
PID 2072 wrote to memory of 316	2072	vbc.exe	83
PID 2072 wrote to memory of 316	2072	vbc.exe	83
PID 2072 wrote to memory of 316	2072	vbc.exe	83
PID 2072 wrote to memory of 316	2072	vbc.exe	83
PID 2072 wrote to memory of 3592	2072	vbc.exe	86
PID 2072 wrote to memory of 3592	2072	vbc.exe	86
PID 2072 wrote to memory of 3592	2072	vbc.exe	86
PID 2072 wrote to memory of 3592	2072	vbc.exe	86
PID 2072 wrote to memory of 3592	2072	vbc.exe	86
PID 2072 wrote to memory of 3592	2072	vbc.exe	86
PID 2072 wrote to memory of 3592	2072	vbc.exe	86
PID 2072 wrote to memory of 3592	2072	vbc.exe	86

C:\Users\Admin\AppData\Local\Temp\9d988c7fc830d3ecc91e22d62c6fe585bdcf6e42d61f1e70117022e9c2bc4bc6.exe
"C:\Users\Admin\AppData\Local\Temp\9d988c7fc830d3ecc91e22d62c6fe585bdcf6e42d61f1e70117022e9c2bc4bc6.exe"
1⤵
- Suspicious use of SetThreadContext
- Drops file in Windows directory
- Suspicious use of WriteProcessMemory
PID:4432
- 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
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2072
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\r6Or7KrEtT.ini"
    3⤵
    PID:316
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\33XWPlJlIT.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:3592

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scripting

1

T1064

Persistence

Privilege Escalation

Defense Evasion

Scripting

1

T1064

Credential Access

Discovery

Lateral Movement

Collection

Email Collection

1

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\r6Or7KrEtT.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/316-146-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/316-144-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/316-145-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/316-147-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/316-141-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2072-156-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2072-143-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2072-135-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2072-155-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3592-150-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3592-152-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3592-153-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3592-154-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4432-133-0x0000000075470000-0x0000000075A21000-memory.dmp

Filesize
5.7MB

Download
memory/4432-139-0x0000000075470000-0x0000000075A21000-memory.dmp

Filesize
5.7MB

Download
memory/4432-132-0x0000000075470000-0x0000000075A21000-memory.dmp

Filesize
5.7MB

Download

Analysis

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