isrstealer | 6bf8fa7d649b794a5d29ba022104117628948061fb6b7d07e2930ed8171be8b5

General

Target

1f4e571f8d420ff455efecde40a5e5c6_JaffaCakes118.exe
Size

326KB
MD5

1f4e571f8d420ff455efecde40a5e5c6
SHA1

e8838441fdd255089a0f509f4359c22d3e1efacb
SHA256

6bf8fa7d649b794a5d29ba022104117628948061fb6b7d07e2930ed8171be8b5
SHA512

c46e076d8ec33ed9544a6dac5486ca8309a953aec722ccb9ca102b88b8e0bf931e5d4e0f320ba761a17aefddaab5144cc85bae4db002ec08a450c2ccd8af2896
SSDEEP

6144:vtYldB7BsYf+Imq1v2BFRFl/kueRW/HP5XoOrQSMt6ZDNvc8L9DhqpwcLT1SQiik:ITBLmMv2BFR7+wHP9PE6ZC8L9D4pBTEx

Score

10^/10

isrstealer 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/1000-4-0x0000000000400000-0x0000000000432000-memory.dmp	family_isrstealer
behavioral2/memory/1000-6-0x0000000000400000-0x0000000000432000-memory.dmp	family_isrstealer
behavioral2/memory/1000-22-0x0000000000400000-0x0000000000432000-memory.dmp	family_isrstealer

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4440-9-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4440-12-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4440-13-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4440-14-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4440-18-0x0000000000400000-0x0000000000453000-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 3376 set thread context of 1000	3376	1f4e571f8d420ff455efecde40a5e5c6_JaffaCakes118.exe	92
PID 1000 set thread context of 4440	1000	vbc.exe	94

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1000	vbc.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 3376 wrote to memory of 1000	3376	1f4e571f8d420ff455efecde40a5e5c6_JaffaCakes118.exe	92
PID 3376 wrote to memory of 1000	3376	1f4e571f8d420ff455efecde40a5e5c6_JaffaCakes118.exe	92
PID 3376 wrote to memory of 1000	3376	1f4e571f8d420ff455efecde40a5e5c6_JaffaCakes118.exe	92
PID 3376 wrote to memory of 1000	3376	1f4e571f8d420ff455efecde40a5e5c6_JaffaCakes118.exe	92
PID 3376 wrote to memory of 1000	3376	1f4e571f8d420ff455efecde40a5e5c6_JaffaCakes118.exe	92
PID 3376 wrote to memory of 1000	3376	1f4e571f8d420ff455efecde40a5e5c6_JaffaCakes118.exe	92
PID 3376 wrote to memory of 1000	3376	1f4e571f8d420ff455efecde40a5e5c6_JaffaCakes118.exe	92
PID 3376 wrote to memory of 1000	3376	1f4e571f8d420ff455efecde40a5e5c6_JaffaCakes118.exe	92
PID 1000 wrote to memory of 4440	1000	vbc.exe	94
PID 1000 wrote to memory of 4440	1000	vbc.exe	94
PID 1000 wrote to memory of 4440	1000	vbc.exe	94
PID 1000 wrote to memory of 4440	1000	vbc.exe	94
PID 1000 wrote to memory of 4440	1000	vbc.exe	94
PID 1000 wrote to memory of 4440	1000	vbc.exe	94
PID 1000 wrote to memory of 4440	1000	vbc.exe	94
PID 1000 wrote to memory of 4440	1000	vbc.exe	94

C:\Users\Admin\AppData\Local\Temp\1f4e571f8d420ff455efecde40a5e5c6_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\1f4e571f8d420ff455efecde40a5e5c6_JaffaCakes118.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3376
- 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:1000
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\tmp.ini"
    3⤵
    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=4408,i,6870419347051655189,5491911050420577193,262144 --variations-seed-version --mojo-platform-channel-handle=4192 /prefetch:8
1⤵
PID:3832

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

Discovery

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/1000-4-0x0000000000400000-0x0000000000432000-memory.dmp

Filesize
200KB

Download
memory/1000-6-0x0000000000400000-0x0000000000432000-memory.dmp

Filesize
200KB

Download
memory/1000-22-0x0000000000400000-0x0000000000432000-memory.dmp

Filesize
200KB

Download
memory/3376-11-0x00000000751D0000-0x0000000075781000-memory.dmp

Filesize
5.7MB

Download
memory/3376-1-0x00000000751D0000-0x0000000075781000-memory.dmp

Filesize
5.7MB

Download
memory/3376-2-0x00000000751D0000-0x0000000075781000-memory.dmp

Filesize
5.7MB

Download
memory/3376-0-0x00000000751D2000-0x00000000751D3000-memory.dmp

Filesize
4KB

Download
memory/4440-12-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4440-14-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4440-16-0x0000000000460000-0x0000000000529000-memory.dmp

Filesize
804KB

Download
memory/4440-18-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4440-13-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4440-9-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download

Analysis

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